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Artículos de revistas sobre el tema "Aerosols – Optical properties"

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Publicado: 4 de junio de 2021

Última modificación: 6 de septiembre de 2023

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1

Zhuang, Bingliang, Tijian Wang, Jane Liu, et al. "The optical properties, physical properties and direct radiative forcing of urban columnar aerosols in the Yangtze River Delta, China." Atmospheric Chemistry and Physics 18, no. 2 (2018): 1419–36. http://dx.doi.org/10.5194/acp-18-1419-2018.

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Abstract. The optical and physical properties as well as the direct radiative forcings (DRFs) of fractionated aerosols in the urban area of the western Yangtze River Delta (YRD) are investigated with measurements from a Cimel sun photometer combined with a radiation transfer model. Ground-based observations of aerosols have much higher temporal resolutions than satellite retrievals. An initial analysis reveals the characteristics of the optical properties of different types of fractionated aerosols in the western YRD. The total aerosols, mostly composed of scattering components (93.8 %), have

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2

Pedrós, R., J. L. Gómez-Amo, C. R. Marcos, et al. "AEROgui: A Graphical User Interface for the Optical Properties of Aerosols." Bulletin of the American Meteorological Society 95, no. 12 (2014): 1863–71. http://dx.doi.org/10.1175/bams-d-13-00162.1.

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Atmospheric aerosols have an uncertain effect on climate and serious impacts on human health. The uncertainty in the aerosols' role on climate has several sources. First, aerosols have great spatial and temporal variability. The spatial variability arises from the fact that aerosols emitted in a certain place can travel thousands of kilometers, swept by the winds to modify the destination region's climate. The spatial variability also means that aerosols are inhomogeneously distributed in the vertical direction, which can lead to a differential effect on the energy balance depending on the aer

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3

Peers, F., F. Waquet, C. Cornet, et al. "Absorption of aerosols above clouds from POLDER/PARASOL measurements and estimation of their direct radiative effect." Atmospheric Chemistry and Physics 15, no. 8 (2015): 4179–96. http://dx.doi.org/10.5194/acp-15-4179-2015.

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Abstract. This study presents an original method to evaluate key parameters for the estimation of the direct radiative effect (DRE) of aerosol above clouds: the absorption of the the cloud albedo. It is based on multi-angle total and polarized radiances both provided by the A-train satellite instrument POLDER – Polarization and Directionality of Earth Reflectances. The sensitivities brought by each kind of measurements are used in a complementary way. Polarization mostly translates scattering processes and is thus used to estimate scattering aerosol optical thickness and aerosol size. On the o

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4

Abd Jalal, Khairunnisa, Arnis Asmat, and Noordin Ahmad. "Retrievals of Aerosol Optical Depth and Angstrom Exponent for Identification of Aerosols at Kuching, Sarawak." Advanced Materials Research 518-523 (May 2012): 5734–37. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5734.

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Anthropogenic and natural aerosols are important atmospheric constituents that significantly contribute to the Earth’s radiation budget but remain uncertainties due to the poor understanding of aerosol properties and its direct effects on scattering and absoprtion of solar radiation and the ability of aerosols to stay in atmosphere for a very short time. Different types of aerosols, representing biomass burning, urban or continental aerosols, maritime aerosols and dust particles will give different characterization and classification of aerosol properties. The data used in this study was obtai

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5

Bergstrom, R. W., P. Pilewskie, P. B. Russell, et al. "Spectral absorption properties of atmospheric aerosols." Atmospheric Chemistry and Physics 7, no. 23 (2007): 5937–43. http://dx.doi.org/10.5194/acp-7-5937-2007.

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Abstract. We have determined the solar spectral absorption optical depth of atmospheric aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spe

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6

Peers, F., F. Waquet, C. Cornet, et al. "Absorption of aerosols above clouds from POLDER/PARASOL measurements and estimation of their Direct Radiative Effect." Atmospheric Chemistry and Physics Discussions 14, no. 18 (2014): 25533–79. http://dx.doi.org/10.5194/acpd-14-25533-2014.

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Abstract. The albedo of clouds and the aerosol absorption are key parameters to evaluate the direct radiative effect of an aerosol layer above clouds. While most of the retrievals of above clouds aerosol characteristics rely on assumptions on the aerosol properties, this study offers a new method to evaluate aerosol and cloud optical properties simultaneously (i.e. aerosol and cloud optical thickness, aerosol single scattering albedo and angström exponent). It is based on multi-angle total and polarized radiances both provided by the A-train satellite instrument POLDER – Polarization and Direc

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7

Jung, Chang Hoon, Sang Hee Han, Ji Yi Lee, and Yong Pyo Kim. "Source-Based Size-Resolved Optical Properties of Carbonaceous Aerosols." Applied Sciences 11, no. 4 (2021): 1434. http://dx.doi.org/10.3390/app11041434.

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In this study, the source-based optical properties of polydisperse carbonaceous aerosols were determined from PM2.5 concentrations measured at a Global Atmospheric Watch station in South Korea. The extinction and absorption coefficients of carbonaceous aerosols were calculated using the Mie theory and assuming a lognormal size distribution. Based on the mass concentration from the EPA’s Positive Matrix Factorization (PMF) receptor model, which considers five source identification and apportionment factors (biogenic source, local biomass burning, secondary organic aerosol, transported biomass b

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8

Bergstrom, R. W., P. Pilewskie, P. B. Russell, et al. "Spectral absorption properties of atmospheric aerosols." Atmospheric Chemistry and Physics Discussions 7, no. 4 (2007): 10669–86. http://dx.doi.org/10.5194/acpd-7-10669-2007.

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Abstract. We have determined the solar spectral absorption optical depth of atmospheric aerosols for specific case studies during several field programs (three cases have been reported previously; two are new results). We combined airborne measurements of the solar net radiant flux density and the aerosol optical depth with a detailed radiative transfer model for all but one of the cases. The field programs (SAFARI 2000, ACE Asia, PRIDE, TARFOX, INTEX-A) contained aerosols representing the major absorbing aerosol types: pollution, biomass burning, desert dust and mixtures. In all cases the spe

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9

Sapkota, Santosh, Sabin Gautam, Santosh Pokhrel, et al. "Study of aerosol optical properties in Lumbini, Nepal." BIBECHANA 20, no. 1 (2023): 1–9. http://dx.doi.org/10.3126/bibechana.v20i1.48825.

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The mixture of different sized particles (fine and coarse) with air composition forms aerosols. Increased economic activities, vehicles, and rapid urbanization made Lumbini one of the heavily polluted regions in Nepal. Data are extracted from AERONET websites between 2013 to 2019 with standard deviation. We are mainly focused on understanding variations in aerosol optical properties: aerosol optical depth (AOD), angstrom parameter (α and β), visibility, single-scattering albedo (SSA), refractive index (real and imaginary), and asymmetry parameter (AP) in the Lumbini region. The maximum value o

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10

Tang, Yanxia, Yong Huang, and Keyong Zhu. "Optical Properties of Black Carbon Aerosols with Different Coating Models." Photonics 9, no. 5 (2022): 359. http://dx.doi.org/10.3390/photonics9050359.

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Research on the optical properties of black carbon (BC) aerosols is highly important for investigating global climate change. A general inhomogeneous particle superposition model is developed. Inhomogeneous particles with arbitrary shapes can be constructed by this model. BC aerosols with core-shell, spherical, ellipsoid, and irregular coating models are established to explore the impact of coating shape on their optical properties. The optical properties are studied employing the discrete dipole approximation method (DDA). The influences of the morphology of BC aerosols, the coating volume fr

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11

Zeki, Khawla N., Ali M. Al-Salihi, and Alaa M. Al-Lami. "Aerosols Optical Properties Over Different Regions Over Iraq." IOP Conference Series: Earth and Environmental Science 1213, no. 1 (2023): 012116. http://dx.doi.org/10.1088/1755-1315/1213/1/012116.

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Abstract investigating the spatial and temporal distribution of aerosols is crucial to the knowledge of their impact on air quality. In present work, the spatiotemporal variation of aerosol over different sites in Iraq was examined using aerosol Optical Depth (AOD) and Angstrom Exponent (AE) from the Moderate Resolution Imaging Spectroradiometer (MODIS) during 2003–2021, and Aerosols Index (AI) retrieved from the Ozone Monitoring Instrument 2005-2021. Satellite retrieval data is divided into three periods include, (2003–2007), (2008–2013) and (2014–2021). The results of the linear regression a

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12

Jung, Chang, Ji Lee, Junshik Um, Seoung Lee, Young Yoon, and Yong Kim. "Estimation of Source-Based Aerosol Optical Properties for Polydisperse Aerosols from Receptor Models." Applied Sciences 9, no. 7 (2019): 1443. http://dx.doi.org/10.3390/app9071443.

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We estimated source-based aerosol optical properties for polydisperse aerosols according to a chemical-species-resolved mass contribution method based on source apportionment. We investigated the sensitivity of aerosol optical properties based on PM2.5 (particulate matter that have a diameter of less than 2.5 micrometers) monitoring results. These aerosols were composed of ions, metals, elemental carbon, and water-soluble organic carbon which includes humic-like carbon substances and water-soluble organic carbon. We calculated aerosols’ extinction coefficients based on the PM2.5 composition da

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13

Trainic, M., A. A. Riziq, A. Lavi, J. M. Flores, and Y. Rudich. "The optical, physical and chemical properties of the products of glyoxal uptake on ammonium sulfate seed aerosols." Atmospheric Chemistry and Physics Discussions 11, no. 7 (2011): 19223–52. http://dx.doi.org/10.5194/acpd-11-19223-2011.

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Abstract. The heterogeneous reaction between gas phase glyoxal and ammonium sulfate (AS) aerosols, a proxy for inorganic atmospheric aerosol, was studied in terms of the dependence of the optical, physical and chemical properties of the product aerosols on initial particle size and ambient RH. The reactions were studied under different relative humidity (RH) conditions, varying from dry conditions (~20 % RH) and up to 90 % RH, covering conditions prevalent in many atmospheric environments. At λ = 355 nm, the reacted aerosols demonstrate a substantial growth in optical extinction cross section,

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14

Tsigaridis, K., Y. Balkanski, M. Schulz, and A. Benedetti. "Global error maps of aerosol optical properties: an error propagation analysis." Atmospheric Chemistry and Physics Discussions 8, no. 4 (2008): 16027–59. http://dx.doi.org/10.5194/acpd-8-16027-2008.

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Abstract. Among the numerous atmospheric constituents, aerosols play a unique role on climate, due to their scattering and absorbing capabilities, visibility degradation and their effect on incoming and outgoing radiation. The most important optical properties are the aerosol optical depth (AOD), the asymmetry parameter (g) and the single scattering albedo (SSA). Uncertainties in aerosol microphysics in global models, which in turn affect their optical properties, propagate to uncertainties on the effect of aerosols on climate. This study aims to estimate the uncertainty of AOD, g and SSA attr

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15

Giannakaki, E., P. G. van Zyl, D. Müller, D. Balis, and M. Komppula. "Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements." Atmospheric Chemistry and Physics Discussions 15, no. 23 (2015): 35237–76. http://dx.doi.org/10.5194/acpd-15-35237-2015.

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Abstract. Optical and microphysical properties of different aerosol types over South Africa measured with a multi-wavelength polarization Raman lidar are presented. This study could assist in bridging existing gaps relating to aerosol properties over South Africa, since limited long-term data of this type is available for this region. The observations were performed under the framework of the EUCAARI campaign in Elandsfontein. The multi-wavelength PollyXT Raman lidar system was used to determine vertical profiles of the aerosol optical properties, i.e. extinction and backscatter coefficients,

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16

Chen, Huimin, Bingliang Zhuang, Jane Liu, et al. "Absorbing Aerosol Optical Properties and Radiative Effects on Near-Surface Photochemistry in East Asia." Remote Sensing 15, no. 11 (2023): 2779. http://dx.doi.org/10.3390/rs15112779.

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Absorbing aerosols have significant influences on tropospheric photochemistry and regional climate change. Here, the direct radiative effects of absorbing aerosols at the major AERONET sites in East Asia and corresponding impacts on near-surface photochemical processes were quantified by employing a radiation transfer model. The average annual aerosol optical depth (AOD) of sites in China, Korea, and Japan was 1.15, 1.02 and 0.94, respectively, and the corresponding proportion of absorbing aerosol optical depth (AAOD) was 8.61%, 6.69%, and 6.49%, respectively. The influence of absorbing aeroso

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17

Menezes, Jorge Almeida de, Rafael Da Silva Palácios, Evanízio Marinho Menezes Júnior, Amazonino Soares Júnior, and José De Souza Nogueira. "CARACTERIZAÇÃO ESPECTRAL DE PROPRIEDADES ÓPTICAS DE AEROSSÓIS EM REGIÃO DE FLORESTA TROPICAL." Nativa 6, no. 5 (2018): 451. http://dx.doi.org/10.31413/nativa.v6i5.5669.

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Aerossóis atmosféricos desempenham um papel importante no equilíbrio de energia do sistema Terra-atmosfera. Medidas de aerossóis foram realizadas em área de floresta tropical utilizando fotômetro solar da rede global AERONET. Dados de 4 anos permitiram classificar as propriedades óticas dos aerossóis, definindo a climatologia para área de floresta tropical. Neste trabalho a profundidade óptica de aerossol (AOD) e expoente Ångström, α(440-870), foram utilizados para a análise espectral de aerossol. Médias de AOD(440nm) de 0,22 (±0,40), com média correspondente de α 1,27(±0,39). A AOD(440nm) mos

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18

Chand, D., P. Guyon, P. Artaxo, et al. "Optical and physical properties of aerosols in the boundary layer and free troposphere over the Amazon Basin during the biomass burning season." Atmospheric Chemistry and Physics Discussions 5, no. 4 (2005): 4373–406. http://dx.doi.org/10.5194/acpd-5-4373-2005.

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Abstract. As part of the Large Scale Biosphere-Atmosphere Experiment in Amazonia – Smoke, Aerosols, Clouds, Rainfall and Climate (LBA-SMOCC) campaign, detailed surface and airborne aerosol measurements were performed over the Amazon Basin during the dry to wet season from 16 September to 14 November 2002. Optical and physical properties of aerosols at the surface, boundary layer (BL) and free troposphere (FT) during the dry season are discussed in this article. Carbon monoxide (CO) is used as a tracer for biomass burning emissions. At the surface, good correlation among the light scattering co

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19

Niranjan, K., B. Melleswara Rao, P. S. Brahmanandam, B. L. Madhavan, V. Sreekanth, and K. Krishna Moorthy. "Spatial characteristics of aerosol physical properties over the northeastern parts of peninsular India." Annales Geophysicae 23, no. 10 (2005): 3219–27. http://dx.doi.org/10.5194/angeo-23-3219-2005.

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Abstract. Measurements on aerosol spectral optical depths and near surface mass-size distributions made at several locations in the states of Andhra Pradesh, Orissa and Chattisgarh, constituting the northeastern part of the peninsular India during the ISRO-GBP land campaign-I show significant regional variations in aerosol physical properties. Higher spectral optical depths were observed in the coastal regions and over southern latitudes compared to interior continental regions and northern latitudes. The optical depths, size index "α" and the near surface aerosol mass concentrations indicate

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20

Li, G., N. Bei, X. Tie, and L. T. Molina. "Aerosol effects on the photochemistry in Mexico City during MCMA-2006/MILAGRO campaign." Atmospheric Chemistry and Physics Discussions 11, no. 3 (2011): 8625–64. http://dx.doi.org/10.5194/acpd-11-8625-2011.

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Abstract. In the present study, the impact of aerosols on the photochemistry in Mexico City is evaluated using the WRF-CHEM model for the period from 24 to 29 March during the MCMA-2006/MILAGRO campaign. An aerosol radiative module has been developed with detailed consideration of aerosol size, composition, and mixture. The module has been coupled into the WRF-CHEM model to calculate the aerosol optical properties, including optical depth, single scattering albedo, and asymmetry factor. Calculated aerosol optical properties are in good agreement with the surface observations and aircraft and s

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21

Li, G., N. Bei, X. Tie, and L. T. Molina. "Aerosol effects on the photochemistry in Mexico City during MCMA-2006/MILAGRO campaign." Atmospheric Chemistry and Physics 11, no. 11 (2011): 5169–82. http://dx.doi.org/10.5194/acp-11-5169-2011.

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Abstract. In the present study, the impact of aerosols on the photochemistry in Mexico City is evaluated using the WRF-CHEM model for the period from 24 to 29 March during the MCMA-2006/MILAGRO campaign. An aerosol radiative module has been developed with detailed consideration of aerosol size, composition, and mixing. The module has been coupled into the WRF-CHEM model to calculate the aerosol optical properties, including optical depth, single scattering albedo, and asymmetry factor. Calculated aerosol optical properties are in good agreement with the surface observations and aircraft and sa

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22

Giannakaki, E., D. S. Balis, V. Amiridis, and C. Zerefos. "Optical properties of different aerosol types: seven years of combined Raman-elastic backscatter lidar measurements in Thessaloniki, Greece." Atmospheric Measurement Techniques 3, no. 3 (2010): 569–78. http://dx.doi.org/10.5194/amt-3-569-2010.

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Abstract. We present our combined Raman/elastic backscatter lidar observations which were carried out at the EARLINET station of Thessaloniki, Greece, during the period 2001–2007. The largest optical depths are observed for Saharan dust and smoke aerosol particles. For local and continental polluted aerosols the measurements indicate high aerosol loads. However, measurements associated with the local path indicate enhanced aerosol load within the Planetary Boundary Layer. The lowest value of aerosol optical depth is observed for continental aerosols, from West directions with less free troposp

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23

Xiao, Da, Tianfen Zhong, Xue Shen, et al. "Retrieval of Aerosol Optical Properties Based on High Spectral Resolution Lidar." EPJ Web of Conferences 237 (2020): 08018. http://dx.doi.org/10.1051/epjconf/202023708018.

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The detection of clouds and aerosols is important for climate research. Lidar has been widely used in atmospheric remote sensing research because of its high spatial and temporal resolution and ability to detect profiles. High spectral resolution lidar (HSRL) accurately calculates the optical properties of aerosols and clouds without relying on any assumptions. Based on the 532nm iodine HSRL system, the lidar ratio of the urban aerosol in Hangzhou is 40-50sr, and the average lidar ratio of the cirrus is 24.79sr, demonstrating that the HSRL system and retrieval algorithms accurately obtain the

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24

Giannakaki, E., D. S. Balis, V. Amiridis, and C. Zerefos. "Optical properties of different aerosol types: seven years of combined Raman- elastic backscatter lidar measurements in Thessaloniki, Greece." Atmospheric Measurement Techniques Discussions 2, no. 6 (2009): 3027–54. http://dx.doi.org/10.5194/amtd-2-3027-2009.

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Abstract. We present our combined Raman/elastic backscatter lidar observations which were carried out at the EARLINET station of Thessaloniki, Greece, during the period 2001–2007. The largest optical depths are observed for Saharan dust and smoke aerosol loads. For "local" and "continental polluted" aerosols the measurements indicate moderate aerosol loads. However, measurements associated with the "local" path show lower values of free tropospheric contribution (37% versus 46% for "continental polluted") and thus, enhanced aerosol load within the Planetary Boundary Layer. The lowest value of

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25

Giannakaki, Elina, Pieter G. van Zyl, Detlef Müller, Dimitris Balis, and Mika Komppula. "Optical and microphysical characterization of aerosol layers over South Africa by means of multi-wavelength depolarization and Raman lidar measurements." Atmospheric Chemistry and Physics 16, no. 13 (2016): 8109–23. http://dx.doi.org/10.5194/acp-16-8109-2016.

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Abstract. Optical and microphysical properties of different aerosol types over South Africa measured with a multi-wavelength polarization Raman lidar are presented. This study could assist in bridging existing gaps relating to aerosol properties over South Africa, since limited long-term data of this type are available for this region. The observations were performed under the framework of the EUCAARI campaign in Elandsfontein. The multi-wavelength PollyXT Raman lidar system was used to determine vertical profiles of the aerosol optical properties, i.e. extinction and backscatter coefficients,

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26

Liu, Y., J. Huang, G. Shi, et al. "Aerosol optical properties determined from sky-radiometer over Loess Plateau of Northwest China." Atmospheric Chemistry and Physics Discussions 11, no. 8 (2011): 23883–910. http://dx.doi.org/10.5194/acpd-11-23883-2011.

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Abstract. The aerosol optical properties and their associated radiative forcing are retrieved from sky-radiometer and surface solar radiation data collected over the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) for the period of March to May (MAM) 2009. The result shows that the seasonal mean aerosol optical depth (AOD) at 500 nm in MAM is 0.4. The single scattering albedo (SSA) at 500 nm in MAM at SACOL fluctuates significantly ranging from 0.82 to 0.97. The averaged value of SSA there for background aerosol is 0.92 in MAM, while it is smaller (0.89) during the

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27

Liu, Yushan, and Bingqi Yi. "Aerosols over East and South Asia: Type Identification, Optical Properties, and Implications for Radiative Forcing." Remote Sensing 14, no. 9 (2022): 2058. http://dx.doi.org/10.3390/rs14092058.

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Identification of aerosol types has long been a difficult problem over East and South Asia due to various limitations. In this study, we use 2-dimensional (2-D) and multi-dimensional Mahalanobis distance (MD) clustering algorithms to identify aerosol characteristics based on the data from the Aerosol Robotic Network from March 1998 to February 2018 over the South and East Asian region (10°N~50°N, 70°E~135°E). The single scattering albedo (SSA), absorption Angstrom exponent (AAE), extinction Angstrom exponent (EAE), real index of refraction (RRI), and imaginary index of refraction (IRI) are uti

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28

Liu, Yushan, and Bingqi Yi. "Aerosols over East and South Asia: Type Identification, Optical Properties, and Implications for Radiative Forcing." Remote Sensing 14, no. 9 (2022): 2058. http://dx.doi.org/10.3390/rs14092058.

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Identification of aerosol types has long been a difficult problem over East and South Asia due to various limitations. In this study, we use 2-dimensional (2-D) and multi-dimensional Mahalanobis distance (MD) clustering algorithms to identify aerosol characteristics based on the data from the Aerosol Robotic Network from March 1998 to February 2018 over the South and East Asian region (10°N~50°N, 70°E~135°E). The single scattering albedo (SSA), absorption Angstrom exponent (AAE), extinction Angstrom exponent (EAE), real index of refraction (RRI), and imaginary index of refraction (IRI) are uti

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29

Chand, D., P. Guyon, P. Artaxo, et al. "Optical and physical properties of aerosols in the boundary layer and free troposphere over the Amazon Basin during the biomass burning season." Atmospheric Chemistry and Physics 6, no. 10 (2006): 2911–25. http://dx.doi.org/10.5194/acp-6-2911-2006.

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Abstract. As part of the Large Scale Biosphere-Atmosphere Experiment in Amazonia – Smoke, Aerosols, Clouds, Rainfall and Climate (LBA-SMOCC) campaign, detailed surface and airborne aerosol measurements were performed over the Amazon Basin during the dry to wet season from 16 September to 14 November 2002. Optical and physical properties of aerosols at the surface, and in the boundary layer (BL) and free troposphere (FT) during the dry season are discussed in this article. Carbon monoxide (CO) is used as a tracer for biomass burning emissions. At the surface, good correlation among the light sc

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30

Trainic, M., A. Abo Riziq, A. Lavi, J. M. Flores, and Y. Rudich. "The optical, physical and chemical properties of the products of glyoxal uptake on ammonium sulfate seed aerosols." Atmospheric Chemistry and Physics 11, no. 18 (2011): 9697–707. http://dx.doi.org/10.5194/acp-11-9697-2011.

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Abstract. The heterogeneous reaction between gas phase glyoxal and ammonium sulfate (AS) aerosols, a proxy for inorganic atmospheric aerosol, was studied in terms of the dependence of the optical, physical and chemical properties of the product aerosols on initial particle size and ambient relative humidity (RH). Our experiments imitate an atmospheric scenario of a dry particle hydration at ambient RH conditions in the presence of glyoxal gas followed by efflorescence due to decrease of the ambient RH. The reactions were studied under different RH conditions, starting from dry conditions (~20%

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31

Stromatas, S., S. Turquety, L. Menut, et al. "Lidar signal simulation for the evaluation of aerosols in chemistry transport models." Geoscientific Model Development 5, no. 6 (2012): 1543–64. http://dx.doi.org/10.5194/gmd-5-1543-2012.

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Abstract. We present an adaptable tool, the OPTSIM (OPTical properties SIMulation) software, for the simulation of optical properties and lidar attenuated backscattered profiles (β') from aerosol concentrations calculated by chemistry transport models (CTM). It was developed to model both Level 1 observations and Level 2 aerosol lidar retrievals in order to compare model results to measurements: the level 2 enables to estimate the main properties of aerosols plume structures, but may be limited due to specific assumptions. The level 1, originally developed for this tool, gives access to more i

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32

Léon, J. F., P. Augustin, M. Mallet, et al. "Aerosol vertical distribution, optical properties and transport over Corsica (western Mediterranean)." Atmospheric Chemistry and Physics Discussions 15, no. 6 (2015): 9507–40. http://dx.doi.org/10.5194/acpd-15-9507-2015.

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Abstract. This paper presents the aerosol vertical distribution observed in the western Mediterranean between February and April 2011 and between February 2012 and August 2013. An elastic backscattering lidar was continuously operated at a coastal site in the northern part of Corsica Island (Cap Corse) for a total of more than 14 000 h of observations. The aerosol extinction coefficient retrieved from cloud-free lidar profiles are analyzed along with the SEVIRI satellite aerosol optical depth (AOD). The SEVIRI AOD was used to constrain the retrieval of the aerosol extinction profiles from the

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Box, Gail P., and Taleb Hallal. "Optical properties of Sydney aerosols." Journal of Southern Hemisphere Earth Systems Science 69, no. 1 (2019): 65. http://dx.doi.org/10.1071/es19001.

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Aerosol chemistry for PM2.5 and PM10 (particulate matter less than 2.5- and 10-μm aerodynamic diameter) samples collected in the Sydney region between November 2002 and December 2003 had been used to estimate size-resolved refractive index for Sydney. Seasonal PM10–2.5 chemistry was obtained by subtracting seasonal PM2.5 from seasonal PM10 chemical composition. The chemical compounds present were determined from the elemental composition using two methods: the SCAPE 2 chemical thermodynamic model and aerosol types based on marker elements. Refractive index was then calculated using a mass frac

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Galytska, E., V. Danylevsky, and S. Snizhko. "Aerosols dynamics in the atmosphere over Eastern Europe by means of AERONET according to weather conditions during summer 2010." Ukrainian hydrometeorological journal, no. 17 (October 29, 2017): 5–16. http://dx.doi.org/10.31481/uhmj.17.2016.01.

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Introduction. Aerosols in the Earth's atmosphere are not only air pollutants but also a factor that affects the climate. The study of the dynamics of aerosol layer properties and aerosol particles properties, and revealing sources of the atmosphere pollution by aerosols is one of the urgent problems of modern environmental sciences. Monitoring of the air pollution caused by aerosols contributes to the determination of its effects on the climate and to the reduction of its negative impacts on the health of the population. The purpose of this paper is to present the analysis of the dynamic

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Nee, Janbai. "Asian Dust properties investigated by multi-instruments." E3S Web of Conferences 99 (2019): 02003. http://dx.doi.org/10.1051/e3sconf/20199902003.

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Dust and many types of aerosols are major pollutants significantly affecting the environment in the East Asia. To identify and classify various types of aerosols is a challenge. In Taiwan and nearby areas, Asian Dust mainly arrive in spring with an average of about 5 dust storms each year. They usually come with some other aerosol sources, therefore it is important to identify these aerosols and their properties. In this paper, we report studying of dust aerosols by using several ground-based and remote sensing measurements. The AERONET data is used to find optical properties of aerosols in 20

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Tian, Pengfei, Xianjie Cao, Lei Zhang, et al. "Aerosol vertical distribution and optical properties over China from long-term satellite and ground-based remote sensing." Atmospheric Chemistry and Physics 17, no. 4 (2017): 2509–23. http://dx.doi.org/10.5194/acp-17-2509-2017.

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Abstract. The seasonal and spatial variations of vertical distribution and optical properties of aerosols over China are studied using long-term satellite observations from the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) and ground-based lidar observations and Aerosol Robotic Network (AERONET) data. The CALIOP products are validated using the ground-based lidar measurements at the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL). The Taklamakan Desert and Tibetan Plateau regions exhibit the highest depolarization and color ratios because of the natural

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A, Scagliotti. "Overview of Optical Technology for Aerosols Characterization." Physical Science & Biophysics Journal 6, no. 2 (2022): 1–7. http://dx.doi.org/10.23880/psbj-16000222.

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The study of the optical properties of particles in micro and macro environments is a field that collects valuable information on the chemistry and microphysics of aerosols (referring to particles and gases). Constant improvements in instrument and detector designs and mechanisms enable measurements with ever-increasing precision and resolution. Moreover, in recent years low-cost open-source technology has emerged as a massive offer, with very good features, which has allowed low-income laboratories and institutions to carry out their own optical measurements on samples and systems of differen

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Irshad, R., R. G. Grainger, D. M. Peters, R. A. McPheat, K. M. Smith, and G. Thomas. "Laboratory measurements of the optical properties of sea salt aerosol." Atmospheric Chemistry and Physics 9, no. 1 (2009): 221–30. http://dx.doi.org/10.5194/acp-9-221-2009.

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Abstract. The extinction spectra of laboratory generated sea salt aerosols have been measured from 1 μm to 20 μm using a Bruker 66v/S FTIR spectrometer. Concomitant measurements include temperature, pressure, relative humidity and the aerosol size distribution. The refractive indices of the sea salt aerosol have been determined using a simple harmonic oscillator band model (Thomas et al., 2004) for aerosol with relative humidities at eight different values between 0.4% to 86%. The resulting refractive index spectra show significant discrepancies when compared to existing sea salt refractive in

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Zhao, Dapeng, Yan Yin, Min Zhang, et al. "The Optical Properties of Aerosols at the Summit of Mount Tai in May and June and the Retrieval of the Complex Refractive Index." Atmosphere 11, no. 6 (2020): 655. http://dx.doi.org/10.3390/atmos11060655.

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To study the optical properties of background atmospheric aerosols in East China, we carried out observations of the physical, chemical and optical properties of atmospheric aerosols at the summit of Mount Tai (Mt. Tai, 1533.7 m above sea level) from 13 May to 25 June 2017. The results show that the average scattering coefficient ( σ sca , 550 ) at 550 nm of the aerosols at the summit of Mt. Tai is 40.3 Mm−1, and the average absorption coefficient ( σ abs , 550 ) at 550 nm is 16.0 Mm−1. The complex refractive index of aerosols is a key parameter for aerosol retrieval and modeling. There are fe

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Raptis, Ioannis-Panagiotis, Stelios Kazadzis, Vassilis Amiridis, Antonis Gkikas, Evangelos Gerasopoulos, and Nikolaos Mihalopoulos. "A Decade of Aerosol Optical Properties Measurements over Athens, Greece." Atmosphere 11, no. 2 (2020): 154. http://dx.doi.org/10.3390/atmos11020154.

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Long-term ground-based measurements of aerosol optical properties in Athens, Greece, for the period 2008–2018 performed by the National Observatory of Athens are used in order to investigate the aerosol climatology of the area. In this study, we utilize quality-assured measurements of the aerosol optical depth (AOD), Single Scattering Albedo (SSA) and Ångström exponent obtained by CIMEL photometers in the framework of the Aerosol Robotic Network (AERONET) to extract the seasonality and the trends of aerosols in the region. Higher aerosol loads are found during spring and summer months. A 1.1%

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Zhuang, Bingliang, Tijian Wang, Jane Liu, et al. "The surface aerosol optical properties in the urban area of Nanjing, west Yangtze River Delta, China." Atmospheric Chemistry and Physics 17, no. 2 (2017): 1143–60. http://dx.doi.org/10.5194/acp-17-1143-2017.

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Abstract. Observational studies of aerosol optical properties are useful for reducing uncertainties in estimations of aerosol radiative forcing and forecasting visibility. In this study, the observed near-surface aerosol optical properties in urban Nanjing are analysed from March 2014 to February 2016. Results show that near-surface urban aerosols in Nanjing are mainly from local emissions and the surrounding regions. They have lower loadings but are more scattering than aerosols in most cities in China. The annual mean aerosol extinction coefficient (EC), single-scattering albedo (SSA) and as

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Adler, G., J. M. Flores, A. Abo Riziq, S. Borrmann, and Y. Rudich. "Chemical, physical, and optical evolution of biomass burning aerosols: a case study." Atmospheric Chemistry and Physics Discussions 10, no. 10 (2010): 24371–407. http://dx.doi.org/10.5194/acpd-10-24371-2010.

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Abstract. In-situ chemical composition measurements of ambient aerosols have been used for characterizing the evolution of submicron aerosols from a large anthropogenic biomass burning (BB) event in Israel. A high resolution Time of Flight Aerosol Mass Spectrometer (Hi-RES-TOF-AMS) was used to follow the chemical evolution of BB aerosols during a night-long, extensive nationwide wood burning event and during the following day. While extensive BB is not common in this region, burning of agricultural waste is a common practice. The aging process of the BB aerosols was followed through their chem

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Adler, G., J. M. Flores, A. Abo Riziq, S. Borrmann, and Y. Rudich. "Chemical, physical, and optical evolution of biomass burning aerosols: a case study." Atmospheric Chemistry and Physics 11, no. 4 (2011): 1491–503. http://dx.doi.org/10.5194/acp-11-1491-2011.

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Abstract. In-situ chemical composition measurements of ambient aerosols have been used for characterizing the evolution of submicron aerosols from a large anthropogenic biomass burning (BB) event in Israel. A high resolution Time of Flight Aerosol Mass Spectrometer (HR-RES-TOF-AMS) was used to follow the chemical evolution of BB aerosols during a night-long, extensive nationwide wood burning event and during the following day. While these types of extensive BB events are not common in this region, burning of agricultural waste is a common practice. The aging process of the BB aerosols was foll

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Su, Yueyuan, Yong Han, Hao Luo, Yuan Zhang, Shiyong Shao, and Xinxin Xie. "Physical-Optical Properties of Marine Aerosols over the South China Sea: Shipboard Measurements and MERRA-2 Reanalysis." Remote Sensing 14, no. 10 (2022): 2453. http://dx.doi.org/10.3390/rs14102453.

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Aerosols play an important role in the Earth–atmosphere system. Their impacts on the weather and climate are highly dependent on spatiotemporal distributions as well as physical-optical properties. Physical-optical properties of the aerosols over the Asian continent have been widely investigated, but there are relatively few observations in maritime locations, especially the South China Sea (SCS). Here, with the combination of in situ ship-based observations from June and July 2019 as well as long-term MERRA-2 reanalysis datasets from January 2012 to December 2021, the physical and optical pro

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Ocko, Ilissa B., and Paul A. Ginoux. "Comparing multiple model-derived aerosol optical properties to spatially collocated ground-based and satellite measurements." Atmospheric Chemistry and Physics 17, no. 7 (2017): 4451–75. http://dx.doi.org/10.5194/acp-17-4451-2017.

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Abstract. Anthropogenic aerosols are a key factor governing Earth's climate and play a central role in human-caused climate change. However, because of aerosols' complex physical, optical, and dynamical properties, aerosols are one of the most uncertain aspects of climate modeling. Fortunately, aerosol measurement networks over the past few decades have led to the establishment of long-term observations for numerous locations worldwide. Further, the availability of datasets from several different measurement techniques (such as ground-based and satellite instruments) can help scientists increa

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Abo Riziq, A., C. Erlick, E. Dinar, and Y. Rudich. "Optical properties of absorbing and non-absorbing aerosols retrieved by cavity ring down (CRD) spectroscopy." Atmospheric Chemistry and Physics 7, no. 6 (2007): 1523–36. http://dx.doi.org/10.5194/acp-7-1523-2007.

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Abstract. Application of cavity ring down (CRD) spectrometry for measuring the optical properties of pure and mixed laboratory-generated aerosols is presented. The extinction coefficient (αext), extinction cross section (σext) and extinction efficiency (Qext) were measured for polystyrene spheres (PSS), ammonium sulphate ((NH4)2(SO4), sodium chloride (NaCl), glutaric acid (GA), and Rhodamine-590 aerosols. The refractive indices of the different aerosols were retrieved by comparing the measured extinction efficiency of each aerosol type to the extinction predicted by Mie theory. Aerosols compos

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Wang, Y., J. Xin, Z. Li, et al. "Seasonal variations in aerosol optical properties over China." Atmospheric Chemistry and Physics Discussions 8, no. 3 (2008): 8431–53. http://dx.doi.org/10.5194/acpd-8-8431-2008.

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Abstract. The seasonal variations in background aerosol optical depth (AOD) and aerosol type are investigated over various ecosystems in China based upon three years' worth of meteorological data and data collected by the Chinese Sun Hazemeter Network. In most parts of China, AODs are at a maximum in spring or summer and at a minimum in autumn or winter. Minimum values (0.10~0.20) of annual mean AOD at 500 nm are found in the Qinghai-Tibetan Plateau, which is located in the remote northeast corner of China, the northern forest ecosystems and Hainan Island. Annual mean AOD ranges from 0.25 to 0

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48

Satheesh, S. K., and J. Srinivasan. "A Method to Estimate Aerosol Radiative Forcing from Spectral Optical Depths." Journal of the Atmospheric Sciences 63, no. 3 (2006): 1082–92. http://dx.doi.org/10.1175/jas3663.1.

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Abstract Radiative forcing of aerosols is much more difficult to estimate than that of well-mixed gases due to the large spatial variability of aerosols and the lack of an adequate database on their radiative properties. Estimation of aerosol radiative forcing generally requires knowledge of its chemical composition, which is sparse. Ground-based sky radiance measurements [e.g., aerosol robotic network (AERONET)] can provide key parameters such as the single-scattering albedo, but in shipborne experiments over the ocean it is difficult to make sky radiance measurements and hence these experime

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Rontu, Laura, Emily Gleeson, Daniel Martin Perez, Kristian Pagh Nielsen, and Velle Toll. "Sensitivity of Radiative Fluxes to Aerosols in the ALADIN-HIRLAM Numerical Weather Prediction System." Atmosphere 11, no. 2 (2020): 205. http://dx.doi.org/10.3390/atmos11020205.

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The direct radiative effect of aerosols is taken into account in many limited-area numerical weather prediction models using wavelength-dependent aerosol optical depths of a range of aerosol species. We studied the impact of aerosol distribution and optical properties on radiative transfer, based on climatological and more realistic near real-time aerosol data. Sensitivity tests were carried out using the single-column version of the ALADIN-HIRLAM numerical weather prediction system, set up to use the HLRADIA simple broadband radiation scheme. The tests were restricted to clear-sky cases to av

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Liu, Y., J. Huang, G. Shi, et al. "Aerosol optical properties and radiative effect determined from sky-radiometer over Loess Plateau of Northwest China." Atmospheric Chemistry and Physics 11, no. 22 (2011): 11455–63. http://dx.doi.org/10.5194/acp-11-11455-2011.

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Abstract. The aerosol optical properties and their associated radiative effects are derived from sky-radiometer and surface solar radiation data collected over the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) for the period of March to May (MAM) 2009. The result shows that the seasonal mean aerosol optical depth (AOD) at 500 nm in MAM is 0.40. The single scattering albedo (SSA) at 500 nm in MAM at SACOL fluctuates significantly ranging from 0.82 to 0.98. The averaged value of SSA there for background aerosol is 0.90 in MAM, while it is smaller (0.87) during the d

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