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Journal articles on the topic 'ANGSTROM EXPONENT (AE)'

Author: Grafiati
Published: 3 June 2025
Last updated: 1 August 2025

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1

Gharibzadeh, Maryam, Khan Alam, Yousefali Abedini, and Abbasali Aliakbari Bidokhti. "Classification of aerosols using multiple clustering techniques over Zanjan, Iran, during 2010-2014." E3S Web of Conferences 99 (2019): 02007. http://dx.doi.org/10.1051/e3sconf/20199902007.

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A more detailed study and identification of aerosol types can help to better understand the sources and effects of aerosols. In the present study, a number of optical properties of aerosols have been investigated seasonal for discrimination of aerosol types during 2010-2014 over Zanjan, Iran. Also using AERosol RObotic NETwork (AERONET) data, aerosol was classified by multiple clustering techniques. Both fine and coarse modes particles were seen in seasonal averaged of Aerosol Volume Size Distribution (AVSD). Single Scattering Albedo (SSA) variations indicate the presence of scattering aerosol
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2

Liaqut, Anum, Isma Younis, and Salman Tariq. "Seasonal Aerosol Classification Over South Asia by Satellite based Atmospheric Optical Data." International Journal of Economic and Environmental Geology 13, no. 3 (2022): 28–37. https://doi.org/10.46660/ijeeg.vol13.iss3.2022.741.

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Aerosol optical characteristics have been investigated to explore regional and seasonal inconsistencies of aerosols and to define the dominant type throughout South Asia from 2001 to 2021. MODIS aerosol products from collection 6.1 have been used in present study, that comprise daily values of Angstrom exponent (AE) and aerosol optical depth (AOD) data. MODIS-derived AODs are validated by using nine ground-based AERONET station data. Overall, an adequate correlation is found among the two datasets. However, an overestimation of the MODIS retrievals is found in one site named Jaipur and underes
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Liaqut, Anum, Isma Younes, and Salman Tariq. "Seasonal Aerosol Classification Over South Asia by Satellite based Atmospheric Optical Data." International Journal of Economic and Environmental Geology 13, no. 3 (2022): 28–37. http://dx.doi.org/10.46660/ijeeg.v13i3.40.

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Aerosol optical characteristics have been investigated to explore regional and seasonal inconsistencies of aerosols and to define the dominant type throughout South Asia from 2001 to 2021. MODIS aerosol products from collection 6.1 have been used in present study, that comprise daily values of Angstrom exponent (AE) and aerosol optical depth (AOD) data. MODIS-derived AODs are validated by using nine ground-based AERONET station data. Overall, an adequate correlation is found among the two datasets. However, an overestimation of the MODIS retrievals is found in one site named Jaipur and underes
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4

Wang, Yucheng, Guojie Xu, Liqi Chen, and Kui Chen. "Characteristics of Air Pollutant Distribution and Sources in the East China Sea and the Yellow Sea in Spring Based on Multiple Observation Methods." Remote Sensing 15, no. 13 (2023): 3262. http://dx.doi.org/10.3390/rs15133262.

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The composition of marine aerosol is quite complex, and its sources are diverse. Across the East China Sea (ECS) and the Yellow Sea (YS), multi-dimensional analysis of marine aerosols was conducted. The characteristics of carbonaceous aerosols and gaseous pollutants were explored through in situ ship-based observation, MERRA-2 reanalysis datasets and TROPOMI data from Sentinel-5P satellite. Black carbon (BC)’s average concentration is 1.35 ± 0.78 μg/m3, with high-value BC observed during the cruise. Through HYSPLIT trajectory analysis, sources of BC were from the northern Eurasian continent, t
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Kumar, Pradeep, Arti Choudhary, Abhay Kumar Singh, Rajendra Prasad, and Anuradha Shukla. "Aerosol Parameters During Winter and Summer Seasons and Meteorological Implications." EPJ Web of Conferences 237 (2020): 02003. http://dx.doi.org/10.1051/epjconf/202023702003.

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The MICROTOPS II aerosol optical depth (AOD) and Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua AOD and angstrom exponent (AE) were collected during December 2016 to May 2017. Higher AOD values were recorded during winter (December - February) and summer (March - May) Months. These values were observed by MICROTOPS II (0.35 - 1.279) and MODIS (0.222 - 1.904) during winter season. During summer AOD values were recorded by MICROTOPS II (0.272 – 1.744) and MODIS (0.227 – 1.33). Whereas MODIS AE (0.218 – 1.799) values were found high during winter season indicates about the dominance o
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6

H. Yaqub, I.Younes, K. Mahmood, and S. Mahmood. "A CASE STUDY OF DUST STORM EVENTS IN PAKISTAN USING NORMALIZED DUST DETECTION INDEX." Pakistan Journal of Science 75, no. 1 (2023): 78–87. http://dx.doi.org/10.57041/pjs.v75i1.825.

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Currently dust storms are among the most prevalent global environmental issues.They are the early warning indicators for desertification and climate change. The study intends toanalyse dust event in Pakistan using normalized dust detection index (NDDI), brightness temperature(BT) and MODIS data of aerosol optical depth (AOD), deep blue angstrom exponent (AE), aerosolindex (AI) and HYSPLIT mass trajectory methods. It also highlighted the relationship between NDDI,BT and AOD. The threshold value of NDDI was 0.19 - 0.36 and BT ≤ 310.5 K. Data from CALIPSO,NCEP/NCAR reanalysis datasets were used t
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7

Guirado, C., E. Cuevas, V. E. Cachorro, et al. "Aerosol characterization at the Saharan AERONET site Tamanrasset." Atmospheric Chemistry and Physics Discussions 14, no. 11 (2014): 16641–90. http://dx.doi.org/10.5194/acpd-14-16641-2014.

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Abstract. More than two years of columnar atmospheric aerosol measurements (2006–2009) at Tamanrasset site, in the heart of the Sahara desert, are analysed. AERONET level 2.0 data were used. The KCICLO method was applied to a part of level 1.5 data series to improve the quality of the results. The annual variability of aerosol optical depth (AOD) and Angstrom exponent (AE) has been found to be strongly linked to the Convective Boundary Layer (CBL) thermodynamic features. The dry-cool season (autumn and winter time) is characterized by a shallow CBL and very low mean turbidity (AOD ~ 0.09 at 44
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8

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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9

Vijayakumar, Katta, Panuganti China Sattilingam Devara, and Saurabh Yadav. "Investigations on Stubble-Burning Aerosols over a Rural Location Using Ground-Based, Model, and Spaceborne Data." Atmosphere 15, no. 11 (2024): 1383. http://dx.doi.org/10.3390/atmos15111383.

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Agriculture crop residue burning has become a major environmental problem facing the Indo-Gangetic plain, as well as contributing to global warming. This paper reports the results of a comprehensive study, examining the variations in aerosol optical, microphysical, and radiative properties that occur during biomass-burning events at Amity University Haryana (AUH), at a rural station in Gurugram (Latitude: 28.31° N, Longitude: 76.90° E, 285 m AMSL), employing ground-based observations of AERONET and Aethalometer, as well as satellite and model simulations during 7–16 November 2021. The smoke em
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10

Yu, Xinyu, Janet Nichol, Kwon Ho Lee, Jing Li, and Man Sing Wong. "Analysis of Long-Term Aerosol Optical Properties Combining AERONET Sunphotometer and Satellite-Based Observations in Hong Kong." Remote Sensing 14, no. 20 (2022): 5220. http://dx.doi.org/10.3390/rs14205220.

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This study analyzes seasonal characteristics and long-term variations in aerosol optical parameters in Hong Kong from 2006 to 2021 using AERONET data and satellite-based observations based on the extreme-point symmetric mode decomposition (ESMD) model. The dominant aerosol types in Hong Kong are mixed aerosols and urban/industrial aerosols with fine-mode sizes, and slightly absorbing or non-absorbing properties. Aerosol optical depth (AOD), Angstrom exponent (AE) and single scattering albedo (SSA) varied seasonally with a lower AOD but higher AE and SSA in summer, and elevated AOD but lower AE
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11

Dundar, Cihan, Ayse Gokcen Isik, and Kahraman Oguz. "Temporal analysis of Sand and Dust Storms (SDS) between the years 2003 and 2017 in the Central Asia." E3S Web of Conferences 99 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/20199902004.

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Mineral dust particles play a vital role in climate and the Earth's energy budget and can have impact on weather systems. It has both direct (dust-radiation effect) and indirect (dust-microphysical effect) impacts on the energy budget effect. The most important sources of dust aerosols are located in the Northern Hemisphere, primarily over the Sahara in North Africa, the Middle East, Central and South Asia respectively and Central Asia is under the influence of mineral dust. The objective of this study to carry out intensity and frequency analysis of sand and dust storm in Central Asia for the
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12

Scarlatti, Francesco, José L. Gómez-Amo, Pedro C. Valdelomar, Víctor Estellés, and María Pilar Utrillas. "A Machine Learning Approach to Derive Aerosol Properties from All-Sky Camera Imagery." Remote Sensing 15, no. 6 (2023): 1676. http://dx.doi.org/10.3390/rs15061676.

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We propose a methodology to derive the aerosol optical depth (AOD) and Angstrom exponent (AE) from calibrated images of an all-sky camera. It is based on a machine learning (ML) approach that establishes a relationship between AERONET measurements of AOD and AE and different signals derived from the principal plane radiance measured by an all-sky camera at three RGB channels. Gaussian process regression (GPR) has been chosen as machine learning method and applied to four models that differ in the input choice: RGB individual signals to predict spectral AOD; red signal only to predict spectral
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13

Sandeep, Varpe1* Mahesh Waghmare1 Swati Kolet1 Rupali Varpe2 Mandar Datar1 &. Sachin Alhat3. "TEMPORAL VARIABILITY OF AEROSOLS PARAMETERS OVER A RURAL AERONET OBSERVING SITE AT GANDHI COLLEGE." GLOBAL JOURNAL OF ENGINEERING SCIENCE AND RESEARCHES 5, no. 10 (2018): 151–55. https://doi.org/10.5281/zenodo.1472142.

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A compressive measurement of aerosol optical depth (AOD), a particulate matter (PM) and black carbon mass concentration have been carried out over Gandhi College. The measured aerosol data was incorporated in an aerosol optical model to estimate various aerosol optical parameters which were subsequently used for radiative forcing estimation. The impact of aerosol on the global climate system is considered as a medium to low. The effect of atmospheric aerosol particle depends on the spatial and vertical distribution of aerosol. This paper aims on a metropolitan AERONET observing site at Gandhi
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14

Liu, Jiemei, Wenxiang Shen, Yuan Yuan, and Shikui Dong. "Optical Characteristics and Radiative Properties of Aerosols in Harbin, Heilongjiang Province during 2017." Atmosphere 12, no. 4 (2021): 463. http://dx.doi.org/10.3390/atmos12040463.

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This study considers aerosol optical properties and direct radiative forcing over Harbin (126.63° E, 45.75° N), the highest latitude city in Northeast China, during 2017. Observations based on the CE-318 sun-photometer show that the annual mean values of the aerosol optical depth (AOD) at 500 nm and the Angstrom exponent (AE) at 440–870 nm over Harbin are respectively 0.26 ± 0.20 and 1.36 ± 0.26. Aerosol loading is the highest in the spring followed by winter, and the lowest loading is in autumn. AE440–870 is the highest in summer, second highest in winter, and lowest in autumn. The Santa Barb
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15

Rupakheti, D., S. Kang, Z. Cong, et al. "STUDY OF AEROSOL OPTICAL PROPERTIES OVER TWO SITES IN THE FOOTHILLS OF THE CENTRAL HIMALAYAS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 1493–97. http://dx.doi.org/10.5194/isprs-archives-xlii-3-1493-2018.

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Atmospheric aerosol possesses impacts on climate system and ecological environments, human health and agricultural productivity. The environment over Himalayas and Tibetan Plateau region are continuously degraded due to the transport of pollution from the foothills of the Himalayas; mostly the Indo-Gangetic Plain (IGP). Thus, analysis of aerosol optical properties over two sites; Lumbini and Kathmandu (the southern slope of central Himalayas) using AERONET’s CIMEL sun photometer were conducted in this study. Aerosol optical depth (AOD at 500 nm), angstrom exponent (α or AE), vol
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16

Bencherif, Hassan, Aziza Bounhir, Nelson Bègue, et al. "Aerosol Distributions and Sahara Dust Transport in Southern Morocco, from Ground-Based and Satellite Observations." Remote Sensing 14, no. 10 (2022): 2454. http://dx.doi.org/10.3390/rs14102454.

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The present study investigates aerosols distributions and a strong Sahara dust-storm event that occurred by early August 2018, in the South of Morocco. We used columnar aerosol optical depth (AOD), Angstrom Exponent (AE) and volume size distributions (VSD) as derived from ground-based observations by 2 AERONET (AErosol RObotic NETwork) sun-photometers at Saada (31.63°N, 8.16°W) and Ouarzazate (30.93°N, 6.91°W) sites, over the periods 2004–2019 and 2012–2015, respectively. The monthly seasonal distributions of AOD, AE, and VSD showed a seasonal trend dominated by the annual cycle, with a maximu
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17

Euphrasie-Clotilde, Lovely, Thomas Plocoste, France-Nor Brute, Cristian Velasco-Merino, Davis Mateos, and Carlos Toledano. "Identification of Aerosols’ Optical Properties in the Caribbean Area Using Ascending Hierarchical Clustering Analysis." Sustainability 17, no. 1 (2024): 177. https://doi.org/10.3390/su17010177.

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Atmospheric aerosols significantly impact air quality, human health, and regional climate, with regions like the Caribbean Basin affected by various aerosol types, including marine, anthropogenic, and desert dust particles. This study utilizes Agglomerative Hierarchical Clustering (AHC) to analyze more than a decade of Aerosol Robotic Network (AERONET) data (2007–2023) from four Caribbean islands: Barbados, Guadeloupe, Puerto Rico, and Cuba. We examined sixteen physical parameters, including Aerosol Optical Depth (AOD), Angstrom Exponent (AE), and Volume Particle Size Distribution (VPSD), to i
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18

Ou, Yang, Zhengqiang Li, Cheng Chen, et al. "Evaluation of MERRA-2 Aerosol Optical and Component Properties over China Using SONET and PARASOL/GRASP Data." Remote Sensing 14, no. 4 (2022): 821. http://dx.doi.org/10.3390/rs14040821.

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The Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) is widely used as an advanced model dataset for the understanding of global climate change. However, independent validation and comparison of MERRA-2 are both insufficient and always desired. Therefore, in this study, the quantitative evaluation of MERRA-2 aerosol products was conducted over China for Aerosol Optical Depth (AOD), Angstrom exponent (AE), absorbing AOD (AAOD) and chemical components (black carbon (BC) and dust (DU)) using Sun sky radiometer Observation NETwork (SONET) ground-based measuremen
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19

Srivastava, A. K., S. Tiwari, P. C. S. Devara, et al. "Pre-monsoon aerosol characteristics over the Indo-Gangetic Basin: implications to climatic impact." Annales Geophysicae 29, no. 5 (2011): 789–804. http://dx.doi.org/10.5194/angeo-29-789-2011.

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Abstract. Sun/sky radiometer observations over the Indo-Gangetic Basin (IGB) region during pre-monsoon (from April–June 2009) have been processed to analyze various aerosol characteristics in the central and eastern IGB region, represented by Kanpur and Gandhi College, respectively, and their impacts on climate in terms of radiative forcing. Monthly mean aerosol optical depth (AOD at 500 nm) and corresponding Angstrom Exponent (AE at 440–870 nm, given within the brackets) was observed to be about 0.50 (0.49) and 0.51 (0.65) in April, 0.65 (0.74) and 0.67 (0.91) in May and 0.69 (0.45) and 0.77
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20

Zeki, Khawla N., Ali M. Al-Salihi, and Alaa M. Al-Lami. "Classification of Aerosols Types Over Iraq, using MODIS Date." IOP Conference Series: Earth and Environmental Science 1262, no. 2 (2023): 022016. http://dx.doi.org/10.1088/1755-1315/1262/2/022016.

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Abstract The optical properties of aerosols are derived from Moderate Resolution Imaging Spectroradiometer (MODIS) observations for the period 2003–2021 at seventeen regions in Iraq, which were used to determine the different types of aerosols using threshold values based on Aerosols Optical Depth (AOD) and Angstrom Exponent (AE), seasonal aerosol classification was performed. This approach was verified and used in the detection process. Six aerosols categories: maritime, dust, mixture, urban, dust desert, and biomass burning were examined in this study. The result indicates that dust is most
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21

Falah, Somaya, Alaa Mhawish, Ali H. Omar, et al. "Intercomparison of Aerosol Types Reported as Part of Aerosol Product Retrieval over Diverse Geographic Regions." Remote Sensing 14, no. 15 (2022): 3667. http://dx.doi.org/10.3390/rs14153667.

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This study examines uncertainties in the retrieval of the Aerosol Optical Depth (AOD) for different aerosol types, which are obtained from different satellite-borne aerosol retrieval products over North Africa, California, Germany, and India and Pakistan in the years 2007–2019. In particular, we compared the aerosol types reported as part of the AOD retrieval from MODIS/MAIAC and CALIOP, with the latter reporting richer aerosol types than the former, and from the Ozone Monitoring Instrument (OMI) and MODIS Deep Blue (DB), which retrieve aerosol products at a lower spatial resolution than MODIS
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22

Li, Jing. "Pollution Trends in China from 2000 to 2017: A Multi-Sensor View from Space." Remote Sensing 12, no. 2 (2020): 208. http://dx.doi.org/10.3390/rs12020208.

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Satellite sensors can provide unique views of global pollution information from space. In particular, a series of aerosol and trace gas monitoring instruments have been operating for more than a decade, providing the opportunity to analyze temporal trends of major pollutants on a large scale. In this study, we integrate aerosol products from MODIS (MODIS Resolution Imaging Spectroradiometer, all abbreviations and their definitions are listed alphabetically in Abbreviations) and MISR (Multi-angle Imaging Spectroradiometer), the AAI (Absorbing Aerosol Index) product from OMI (Ozone Monitoring In
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23

Vaghmaria, Nisha, James ME, Alok Sagar Gautam, and Sneha Gautam. "Impact of Lockdown on Column and Surface Aerosol Content over Ahmedabad and a Comparison with the Indo-Gangetic Plain." Earth 4, no. 2 (2023): 278–95. http://dx.doi.org/10.3390/earth4020015.

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Changes in vertical column concentration, size distribution, and surface concentration of aerosol associated with the lockdown imposed by the COVID-19 pandemic in 2020 over the Ahmedabad region in Gujarat State, India, were analyzed. The results are compared with changes over selected Indo-Gangetic Plain (IGP) regions. On 25 March 2020, the prime minister of India declared a complete lockdown throughout the country and later lifted restrictions in a phased manner. Aerosol optical depth (AOD) over the Ahmedabad region on 29 March dropped to as low as 0.11, and in the first two weeks of lockdown
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24

Zhuang, B. L., T. J. Wang, J. Liu, et al. "Absorption coefficient of urban aerosol in Nanjing, west Yangtze River Delta of China." Atmospheric Chemistry and Physics Discussions 15, no. 12 (2015): 16175–213. http://dx.doi.org/10.5194/acpd-15-16175-2015.

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Abstract. Absorbing aerosols can significantly modulate shortwave solar radiation in the atmosphere, affecting regional and global climate. Aerosol absorption coefficient (AAC) is an indicator to assess the impact of absorbing aerosols on radiative forcing. In this study, the near-surface AAC and absorption angstrom exponent (AAE) in urban Nanjing, China, are characterized on the basis of measurements in 2012 and 2013 using the 7-channel Aethalometer (model AE-31, Magee Scientific, USA). The AAC is estimated with direct and indirect corrections, which show consistent temporal variations and ma
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Choi, M., J. Kim, J. Lee, et al. "GOCI Yonsei Aerosol Retrieval (YAER) algorithm and validation during DRAGON-NE Asia 2012 campaign." Atmospheric Measurement Techniques Discussions 8, no. 9 (2015): 9565–609. http://dx.doi.org/10.5194/amtd-8-9565-2015.

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Abstract. The Geostationary Ocean Color Imager (GOCI) onboard the Communication, Ocean, and Meteorology Satellites (COMS) is the first multi-channel ocean color imager in geostationary orbit. Hourly GOCI top-of-atmosphere radiance has been available for the retrieval of aerosol optical properties over East Asia since March 2011. This study presents improvements to the GOCI Yonsei Aerosol Retrieval (YAER) algorithm over ocean and land together with validation results during the DRAGON-NE Asia 2012 campaign. Optical properties of aerosol are retrieved from the GOCI YAER algorithm including aeros
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26

Puthukkudy, Anin, J. Vanderlei Martins, Lorraine A. Remer, et al. "Retrieval of aerosol properties from Airborne Hyper-Angular Rainbow Polarimeter (AirHARP) observations during ACEPOL 2017." Atmospheric Measurement Techniques 13, no. 10 (2020): 5207–36. http://dx.doi.org/10.5194/amt-13-5207-2020.

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Abstract. Multi-angle polarimetric (MAP) imaging of Earth scenes can be used for the retrieval of microphysical and optical parameters of aerosols and clouds. The Airborne Hyper-Angular Rainbow Polarimeter (AirHARP) is an aircraft MAP instrument with a hyper-angular imaging capability of 60 along-track viewing angles at 670 nm and 20 along-track viewing angles at other wavelengths – 440, 550, and 870 nm – across the full 114∘ (94∘) along-track (cross-track) field of view. Here we report the retrieval of aerosol properties using the Generalized Retrieval of Aerosols and Surface Properties (GRAS
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27

Cao, Zhaoxiang, Kuifeng Luan, Peng Zhou, et al. "Evaluation and Comparison of Multi-Satellite Aerosol Optical Depth Products over East Asia Ocean." Toxics 11, no. 10 (2023): 813. http://dx.doi.org/10.3390/toxics11100813.

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The atmosphere over the ocean is an important research field that involves multiple aspects such as climate change, atmospheric pollution, weather forecasting, and marine ecosystems. It is of great significance for global sustainable development. Satellites provide a wide range of measurements of marine aerosol optical properties and are very important to the study of aerosol characteristics over the ocean. In this study, aerosol optical depth (AOD) data from seventeen AERONET (Aerosol Robotic Network) stations were used as benchmark data to comprehensively evaluate the data accuracy of six ae
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Regmi, Jeevan, Khem N. Poudyal, Amod Pokhrel, Madhu Gyawali, Anthony Barinelli, and Rudra Aryal. "Analysis of Aerosol Optical Depth and Angstrom Exponents over an AERONET site at Pokhara, Nepal." BIBECHANA 18, no. 1 (2021): 118–27. http://dx.doi.org/10.3126/bibechana.v18i1.29448.

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The monthly variability of Aerosol Optical Depth at 0.50 μm (AOD0.50) and Ångström exponents (AE) based on spectral AODs over an Aerosol Robotic Network (AERONET) site Pokhara, are analyzed by using aerosol data of the year 2017. The AOD0.50 are characterized by low average values (0.21± 0.12) in monsoon, and highest values in pre-monsoon (0.67± 0.14) followed by winter (0.46± 0.28) and post-monsoon (0.33±.02) with an overall mean of 0.43 ± 0.02. The average AE obtained by using AODs at 0.44 μm and 0.87 μm is 1.20± 0.04 in pre-monsoon, 1.37± 0.05 in monsoon, 1.41±.01 in post-monsoon, and 1.37±
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Schutgens, N. A. J., T. Miyoshi, T. Takemura, and T. Nakajima. "Applying an ensemble Kalman filter to the assimilation of AERONET observations in a global aerosol transport model." Atmospheric Chemistry and Physics Discussions 9, no. 6 (2009): 23835–73. http://dx.doi.org/10.5194/acpd-9-23835-2009.

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Abstract. We present a global aerosol assimilation system based on an ensemble Kalman filter, which we believe leads to a significant improvement in aerosol fields. The ensemble allows realistic, spatially and temporally variable model covariances (unlike other assimilation schemes). As the analyzed variables are mixing ratios (prognostic variables of the aerosol transport model), there is no need for the extra assumptions required by previous assimilation schemes analyzing aerosol optical thickness (AOT). We describe the implementation of this assimilation system and in particular the constru
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Schutgens, N. A. J., T. Miyoshi, T. Takemura, and T. Nakajima. "Applying an ensemble Kalman filter to the assimilation of AERONET observations in a global aerosol transport model." Atmospheric Chemistry and Physics 10, no. 5 (2010): 2561–76. http://dx.doi.org/10.5194/acp-10-2561-2010.

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Abstract. We present a global aerosol assimilation system based on an Ensemble Kalman filter, which we believe leads to a significant improvement in aerosol fields. The ensemble allows realistic, spatially and temporally variable model covariances (unlike other assimilation schemes). As the analyzed variables are mixing ratios (prognostic variables of the aerosol transport model), there is no need for the extra assumptions required by previous assimilation schemes analyzing aerosol optical thickness (AOT). We describe the implementation of this assimilation system and in particular the constru
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31

Sogacheva, Larisa, Matthieu Denisselle, Pekka Kolmonen, et al. "Extended validation and evaluation of the OLCI–SLSTR SYNERGY aerosol product (SY_2_AOD) on Sentinel-3." Atmospheric Measurement Techniques 15, no. 18 (2022): 5289–322. http://dx.doi.org/10.5194/amt-15-5289-2022.

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Abstract. We present the first extended validation of a new SYNERGY global aerosol product (SY_2_AOD), which is based on synergistic use of data from the Ocean and Land Color Instrument (OLCI) and the Sea and Land Surface Temperature Radiometer (SLSTR) sensors aboard the Copernicus Sentinel-3A (S3A) and Sentinel-3B (S3B) satellites. Validation covers period from 14 January 2020 to 30 September 2021. Several approaches, including statistical analysis, time series analysis, and comparison with similar aerosol products from the other spaceborne sensor, the Moderate Resolution Imaging Spectroradio
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Huneeus, N., M. Schulz, Y. Balkanski, et al. "Global dust model intercomparison in AeroCom phase I." Atmospheric Chemistry and Physics 11, no. 15 (2011): 7781–816. http://dx.doi.org/10.5194/acp-11-7781-2011.

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Abstract. This study presents the results of a broad intercomparison of a total of 15 global aerosol models within the AeroCom project. Each model is compared to observations related to desert dust aerosols, their direct radiative effect, and their impact on the biogeochemical cycle, i.e., aerosol optical depth (AOD) and dust deposition. Additional comparisons to Angström exponent (AE), coarse mode AOD and dust surface concentrations are included to extend the assessment of model performance and to identify common biases present in models. These data comprise a benchmark dataset that is propos
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Millet, Tristan, Hassan Bencherif, Aziza Bounhir, et al. "Aerosol Distributions and Transport over Southern Morocco from Ground-Based and Satellite Observations (2004–2020)." Atmosphere 13, no. 6 (2022): 923. http://dx.doi.org/10.3390/atmos13060923.

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The present study investigates the optical properties of aerosols on daily and seasonal scales with the use of the aerosol optical depth (AOD) and Angström exponent (AE) data retrieved from AErosol RObotic NETwork (AERONET) and collected at four stations in Southern Morocco—Saada (31.63° N; 8.16° W), Ouarzazate (30.93° N; 6.91° W), Oukaïmeden (31.21° N; 7.86° W) and Ras-El-Aïn (31.67° N; 7.60° W). An evaluation of the aerosol volumetric size distribution (AVSD) is also obtained for Saada and Ouarzazate. An AOD inter-comparison is performed between AERONET data and satellite sensors (MODerate r
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Millet, Tristan, Hassan Bencherif, Aziza Bounhir, et al. "Aerosol Distributions and Transport over Southern Morocco from Ground-Based and Satellite Observations (2004–2020)." Atmosphere 13, no. 6 (2022): 923. http://dx.doi.org/10.3390/atmos13060923.

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The present study investigates the optical properties of aerosols on daily and seasonal scales with the use of the aerosol optical depth (AOD) and Angström exponent (AE) data retrieved from AErosol RObotic NETwork (AERONET) and collected at four stations in Southern Morocco—Saada (31.63° N; 8.16° W), Ouarzazate (30.93° N; 6.91° W), Oukaïmeden (31.21° N; 7.86° W) and Ras-El-Aïn (31.67° N; 7.60° W). An evaluation of the aerosol volumetric size distribution (AVSD) is also obtained for Saada and Ouarzazate. An AOD inter-comparison is performed between AERONET data and satellite sensors (MODerate r
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de Oliveira, Aline M., Cristina T. Souza, Nara P. M. de Oliveira, et al. "Analysis of Atmospheric Aerosol Optical Properties in the Northeast Brazilian Atmosphere with Remote Sensing Data from MODIS and CALIOP/CALIPSO Satellites, AERONET Photometers and a Ground-Based Lidar." Atmosphere 10, no. 10 (2019): 594. http://dx.doi.org/10.3390/atmos10100594.

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A 12-year analysis, from 2005 to 2016, of atmospheric aerosol optical properties focusing for the first time on Northeast Brazil (NEB) was performed based on four different remote sensing datasets: the Moderate Resolution Imaging Spectroradiometer (MODIS), the Aerosol Robotic Network (AERONET), the Cloud-Aerosol LIDAR with Orthogonal Polarization (CALIOP) and a ground-based Lidar from Natal. We evaluated and identified distinct aerosol types, considering Aerosol Optical Depth (AOD) and Angström Exponent (AE). All analyses show that over the NEB, a low aerosol scenario prevails, while there are
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Huang, Xiaocan, Jianhua Zhu, Bing Han, et al. "Evaluation of Four Atmospheric Correction Algorithms for GOCI Images over the Yellow Sea." Remote Sensing 11, no. 14 (2019): 1631. http://dx.doi.org/10.3390/rs11141631.

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Atmospheric correction (AC) for coastal waters is an important issue in ocean color remote sensing. AC performance is fundamental in retrieving reliable water-leaving radiances and then bio-optical parameters. Unlike polar-orbiting satellites, geostationary ocean color sensors allow high-frequency (15–60 min) monitoring of ocean color over the same area. The first geostationary ocean color sensor, i.e., the Geostationary Ocean Color Imager (GOCI), was launched in 2010. Using GOCI data acquired over the Yellow Sea in summer 2017 at three principal overpass times (02:16, 03:16, 04:16 UTC) with ±
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Papayannis, A., R. E. Mamouri, V. Amiridis, et al. "Systematic lidar observations of Saharan dust layers over Athens, Greece in the frame of EARLINET project (2004–2006)." Annales Geophysicae 27, no. 9 (2009): 3611–20. http://dx.doi.org/10.5194/angeo-27-3611-2009.

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Abstract. In this paper we present a statistical analysis on the geometrical and optical properties of Saharan dust layers observed over Athens, Greece, in a three-year period from 1 January 2004 up to 31 December 2006. The observations of the vertical aerosol profile were performed by the multi-wavelength (355-532-1064-387-607 nm) Raman lidar system of the National Technical University of Athens (NTUA) operated in the city of Athens (37°98' N, 23°77' E), Greece, in the frame of the European Aerosol Research Lidar Network (EARLINET-ASOS) project. The number of dust events was greatest in late
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38

Huneeus, N., M. Schulz, Y. Balkanski, et al. "Global dust model intercomparison in AeroCom phase I." Atmospheric Chemistry and Physics Discussions 10, no. 10 (2010): 23781–864. http://dx.doi.org/10.5194/acpd-10-23781-2010.

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Abstract. Desert dust plays an important role in the climate system through its impact on Earth's radiative budget and its role in the biogeochemical cycle as a source of iron in high-nutrient-low-chlorophyll regions. A large degree of diversity exists between the many global models that simulate the dust cycle to estimate its impact on climate. We present the results of a broad intercomparison of a total of 15 global aerosol models within the AeroCom project. Each model is compared to observations focusing on variables responsible for the uncertainties in estimating the direct radiative effec
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Sinyuk, Alexander, Brent N. Holben, Thomas F. Eck, et al. "The AERONET Version 3 aerosol retrieval algorithm, associated uncertainties and comparisons to Version 2." Atmospheric Measurement Techniques 13, no. 6 (2020): 3375–411. http://dx.doi.org/10.5194/amt-13-3375-2020.

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Abstract. The Aerosol Robotic Network (AERONET) Version 3 (V3) aerosol retrieval algorithm is described, which is based on the Version 2 (V2) algorithm with numerous updates. Comparisons of V3 aerosol retrievals to those of V2 are presented, along with a new approach to estimate uncertainties in many of the retrieved aerosol parameters. Changes in the V3 aerosol retrieval algorithm include (1) a new polarized radiative transfer code (RTC), which replaced the scalar RTC of V2, (2) detailed characterization of gas absorption by adding NO2 and H2O to specify total gas absorption in the atmospheri
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Singh, Lakshman Sharan. "High Density Study of Vaporiser before Mansoon Weather for Density Dependent Parameter." Innovation The Research Concept 8, no. 7 (2023). https://doi.org/10.5281/zenodo.10113093.

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This paper has been published in Peer-reviewed International Journal "Innovation The Research Concept"    URL : https://www.socialresearchfoundation.com/new/publish-journal.php?editID=7627 Publisher : Social Research Foundation, Kanpur (SRF International)    Abstract : Aerosol characteristics over Mohania region during premonsoon (March - May) period were analyzed for year 2016. Aerosol optical properties and angstrom exponent were measured using MICROTOPS-II Sunphotometer. The mean AOD for the period of study was found to be 0.78 where as mean
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Gupta, Pratima, Ashok Jangid, and Ranjit Kumar. "Assessment of aerosol optical and physical properties and implications for radiative effects over the semiarid region of Indo‐Gangetic Basin." Geological Journal, September 28, 2023. http://dx.doi.org/10.1002/gj.4857.

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This study assesses the physical and optical properties and estimated the radiative forcing of aerosol at Agra over the Indo‐Gangetic Basin (IGB) during July 2016–December 2019 using black carbon (BC) mass concentration (AE‐33 aethalometer), data sets from satellite and model simulations. The optical properties of aerosol and radiative forcing have been measured by the Optical and Physical Properties of Aerosols and Clouds (OPAC) and Santa Barbara Discrete Ordinate Radiative Transfer Atmospheric Radiative Transfer (SBDART) model. The high BC mass concentration has been observed in November and
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Fu, Guangliang, Jeroen Rietjens, Raul Laasner, et al. "Aerosol Retrievals From SPEXone on the NASA PACE Mission: First Results and Validation." Geophysical Research Letters 52, no. 4 (2025). https://doi.org/10.1029/2024gl113525.

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AbstractWe present the first Spectropolarimeter for Planetary EXploration ‐ one (SPEXone) aerosol retrieval results over land and ocean using the Remote sensing of Trace gas and Aerosol Products algorithm, covering the period 23 February–31 August 2024. We validate the retrieved Aerosol Optical Depth (AOD), Angstrom Exponent (AE), and Single Scattering Albedo (SSA) with AErosol RObotic NETwork (AERONET) data. The validation results show that SPEXone provides products of good quality, with comparable performance over land and ocean. For AOD, the Root‐Mean‐Square Error (RMSE) is 0.053 over land
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Tumur-Uyal, Narangarav, Baatarchuluun Tsermaa, Tuvshinjargal Baldorj, Javzandolgor Bad, and Daariimaa Badarch. "Effect of coal type on aerosol optical properties at Ulaanbaatar city." Proceedings of the Mongolian Academy of Sciences, October 28, 2024, 44–52. http://dx.doi.org/10.5564/pmas.v64i02.3651.

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In this study, seasonal characteristics of aerosol optical properties at Ulaanbaatar station of the international network of SKYNET are investigated using ground-based skyradiometer from the years extending from 2017 to 2023. The aerosol optical thickness (AOT) at 500nm wavelength and Angstrom exponent (AE) were determined in winter to evaluate the decrease in air pollution in Ulaanbaatar since implementing the government's decision to use coal briquettes for household heating. During the study period, the monthly mean AOT at 500nm varied throughout the year, with the maximum value of 0.178±0.
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Dayanandan, Baiju, Nirmal Krishna, Ajay Parottil, et al. "Initial Study of Column-Integrated Aerosol Optical Properties over Birkat al Mouz, Sultanate of Oman." Aerosol and Air Quality Research 25, no. 5 (2025). https://doi.org/10.1007/s44408-025-00014-0.

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Abstract Purpose This study aims to provide the first analysis of aerosol optical properties, radiative forcing, and source identification over Birkat al Mouz, Oman, using Aerosol Robotic Network (AERONET) data from December 2022 to November 2024. Methods We analyzed Aerosol Optical Depth (AOD), Angstrom Exponent (AE), Single Scattering Albedo (SSA), aerosol radiative forcing (RF), and performed Concentration-Weighted Trajectory (CWT) analysis to identify aerosol transport pathways and sources. Results The highest aerosol loading (AOD = 0.49 ± 0.15) occurred in summer, with the lowest (0.17 ±
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Köse, Ali, Salman Tariq, Banu Numan Uyal, Muhammad Khan, Husam Rjoub, and Usman Mehmood. "Analysis of nighttime aerosols and relation to covariates over a highly polluted sub‐Saharan site using Mann–Kendall and wavelet coherence approach." Journal of Environmental Quality, January 31, 2024. http://dx.doi.org/10.1002/jeq2.20543.

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AbstractHigh emissions of aerosols and trace gases during nighttime can cause serious air quality, climate, and health issues, particularly in extremely polluted cities. In this paper, an effort has been made to examine the variations in aerosols and trace gases over a sub‐Saharan city of Ilorin (Nigeria) during nighttime. We have used Aerosol Robotic Network data of aerosol optical depth (AOD) at 500 nm, Angstrom exponent (AE) (440/870), and precipitable water (WVC). Both AE and WVC showed a decreasing trend of −0.0012% and −0.0010% per year, respectively. We also analyzed nighttime data of c
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Aladodo, Shehu Sarafadeen, Ibrahim Bolaji Balogun, and Ibrahim Tudunwada Yakub. "Variation, distribution and trends of aerosol optical properties in Africa during 2000-2022." Journal of the Nigerian Society of Physical Sciences, May 1, 2025, 2270. https://doi.org/10.46481/jnsps.2025.2270.

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Global anthropogenic emissions have been on the increase causing environmental and climatic concerns. To this end, aerosol properties influenced by these anthropogenic activities from satellite and ground remote sensing were examined for distribution, variation, and trends over Africa during 2000–2022. Furthermore, the response of temperature to the interaction of aerosols with solar radiation was investigated in the region. The spatial distribution of the aerosol properties were characterized as high (towards maximum values), moderate (around middle values), and low (towards least values) whi
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Tansey, Emily, Roger Marchand, and Duli Chand. "MODIS Aerosol and Low‐Cloud Retrievals: Orographic Effects in the Wake of Macquarie Island." Earth and Space Science 12, no. 5 (2025). https://doi.org/10.1029/2024ea004129.

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AbstractVisible/infrared imagery from passive satellites is commonly relied upon to study low cloud microphysics over oceanic regions, including for the Southern Ocean (SO), but relatively little validation has been undertaken for the SO. In this article, we compare low‐cloud effective radius (re), cloud droplet number concentration (Nd) and cloud liquid water path (LWP) retrievals from the NASA Moderate Imaging Spectroradiometer (MODIS) with surface measurements collected during the Macquarie Island Cloud and Radiation Experiment (MICRE). MODIS 3.7‐μm band retrievals show little bias and mode
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Zaman, Shahid Uz, Md Riad Sarkar Pavel, Rumana Islam Rani, et al. "Aerosol climatology characterization over Bangladesh using ground-based and remotely sensed satellite measurements." Elementa: Science of the Anthropocene 10, no. 1 (2022). http://dx.doi.org/10.1525/elementa.2021.000063.

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Atmospheric aerosols affect human health, alter cloud optical properties, influence the climate and radiative balance, and contribute to the cooling of the atmosphere. Aerosol climatology based on aerosol robotic network (AERONET) and ozone monitoring instrument (OMI) data from two locations (Urban Dhaka and coastal Bhola Island) over Bangladesh was conducted for 8 years (2012–2019), focusing on two characterization schemes. Four aerosol parameters, such as extinction angstrom exponent (EAE), absorption AE (AAE), single scattering albedo (SSA), and real refractive index (RRI), were exclusively
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Sapkota, Santosh, Sabin Gautam, Aayush Gautam, et al. "Comparison of aerosol optical properties over Lumbini, Pokhara and Langtang-Base Camp." Himalayan Physics, June 1, 2023, 58–65. http://dx.doi.org/10.3126/hp.v10i1.55280.

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 The comparative study of aerosol optical properties at different tourist places in Nepal has been performed. Lumbini, Pokhara and Langtang-Base Camp (BC) were the places chosen for observation. Aerosols are made up of a variety of airborne particles both fine and coarse and are most prevalent in urban industrial Areas. The data was collected from AERONET websites between 2017 and 2019 for each of the locations. The ranges of AOD over Pokhara and Langtang-BC were discovered to be lower (0.1 and 0.01) and the maximum and minimum values of AOD (675 nm) in Lumbini occur
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Li, Huaping, Ming Zhang, Lunche Wang, Xin Su, and Yunbo Lu. "Effects of Different Types of Aerosols on Diffuse Radiation Based on Global AERONET." Journal of Geophysical Research: Atmospheres 130, no. 5 (2025). https://doi.org/10.1029/2024jd042701.

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AbstractThis study analyses the characteristics of the diffuse radiation (DSR) in the region of different types of aerosols and assesses the effect of aerosols on the DSR based on the AERONET aerosol data for the years 2010–2020. The results are as follows: the interannual trends of DSR and diffuse radiation fraction (DSRF) for all aerosol types in this study tend to coincide with the interannual trends of aerosol optical depth (AOD). Both AOD and solar zenith angle (SZA) are assessed to have higher feature significance for both DSR and DSRF during the period of the study, which indicates that
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