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Dissertations / Theses on the topic 'Aerosol microphysical properties'

Author: Grafiati

Published: 22 June 2024

Last updated: 31 July 2025

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1

Hamburger, Thomas. "Aerosol microphysical properties during anticyclonic flow conditions over Europe." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-127766.

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2

Wurl, Daniela. "Optimal Estimation Retrieval of Aerosol Microphysical Properties in the Lower Stratosphere from SAGE II Satellite Observations." Thesis, University of Canterbury. Physics and Astronomy, 2007. http://hdl.handle.net/10092/1533.

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A new retrieval algorithm has been developed based on the Optimal Estimation (OE) approach, which retrieves lognormal aerosol size distribution parameters from multiwavelength aerosol extinction data, as measured by the Stratospheric Aerosol and Gas Experiment (SAGE) II in the lower stratosphere. Retrieving these aerosol properties becomes increasingly more difficult under aerosol background conditions, when tiny particles (« 0.1 µm) prevail, to which the experiment is nearly or entirely insensitive. A successful retrieval algorithm must then be able (a) to fill the 'blind spot' with suitable

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3

Wagner, Janet. "Microphysical aerosol properties retrieved from combined lidar and sun photometer measurements." Master's thesis, Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-99830.

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To assess information about the optical, microphysical, and radiative properties of aerosol particles the lidar technique and sun photometers are commonly used. Information that result from both lidar and sun photometer data can provide a distinct image of the vertical aerosol properties. The algorithm developed at the Institute of Physics of the National Academy of Science of Belarus (IPNASB) uses lidar measurements at the three wavelengths 355, 532, and 1064 nm and mean backscatter and extinction coefficients retrieved from radiometric data to obtain profiles of fine-mode and coarse-mode con

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4

Schmidt, Jörg. "Dual-field-of-view Raman lidar measurements of cloud microphysical properties." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-150408.

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Im Rahmen der vorliegenden Arbeit wurde eine neuartige Lidartechnik in ein leistungsstarkes Lidar-System implementiert. Mit Hilfe des realisierten Aufbaus wurden Aerosol-Wolken-Wechselwirkungen in Flüssigwasserwolken über Leipzig untersucht. Die angewandte Messmethode beruht auf der Detektion von Licht, das an Wolkentröpfchen mehrfach in Vorwärtsrichtung gestreut und an Stickstoffmolekülen inelastisch zurückgestreut wurde. Dabei werden zwei Gesichtsfelder unterschiedlicher Größe verwendet. Ein Vorwärtsiterations-Algorithmus nutzt die gewonnenen Informationen zur Ermittlung von Profilen wolkenm

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5

Nichman, Leonid. "Optical measurements of the microphysical properties of aerosol and small cloud particles in the CLOUD project." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/optical-measurements-of-the-microphysical-properties-of-aerosol-and-small-cloud-particles-in-the-cloud-project(ad792d0c-90d1-4704-b666-b75d284b40fe).html.

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Clouds play an important role in precipitation, solar radiation budget and electrification of Earth's atmosphere. The presence of small ice crystals in clouds and their morphology can complicate parametrisation and climate modelling, consequently leading to a net cooling feedback on climate. In situ airborne measurements provide single particle characterisation with high temporal and spatial resolution allowing better understanding of atmosphericprocesses of ice nucleation and growth. Simulations of the preindustrial clouds and accurate characterisation and comparison of the instruments requir

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6

Ditas, Florian. "Microphysical properties of aerosol particles in the trade wind regime and their influence on the number concentration of activated particles in trade wind cumulus clouds." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-151594.

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Im Rahmen dieser Dissertation wurden die mikrophysikalischen Eigenschaften von Aerosolpartikeln im Passatklima und deren Einfluss auf Passatwolken untersucht. Die Arbeit basiert auf Messungen mit der hubschrauber-getragenen Messplattform ACTOS. Es wurden zwei Intensivmesskampagnen im November 2010 und April 2011 durchgeführt, welche 31 Forschungsflüge in der Nähe der östlichsten Karibik-Insel Barbados umfassen. Die gemessenen Partikel-Anzahl-Größenverteilungen weisen meist eine bimodale Verteilung auf, welche typisch für marines Aerosol ist. Im Vergleich zu kontinentalen Verhältnissen ist die

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7

Schmidt, Jörg [Verfasser], Andreas [Akademischer Betreuer] Macke, Andreas [Gutachter] Macke, and Herman [Gutachter] Russchenberg. "Dual-field-of-view Raman lidar measurements of cloud microphysical properties : Investigation of aerosol-cloud interactions / Jörg Schmidt ; Gutachter: Andreas Macke, Herman Russchenberg ; Betreuer: Andreas Macke." Leipzig : Universitätsbibliothek Leipzig, 2014. http://d-nb.info/123878867X/34.

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8

Ditas, Florian [Verfasser], Alfred [Gutachter] Wiedensohler, and Alfons [Gutachter] Schwarzenböck. "Microphysical properties of aerosol particles in the trade wind regime and their influence on the number concentration of activated particles in trade wind cumulus clouds / Florian Ditas ; Gutachter: Alfred Wiedensohler, Alfons Schwarzenböck." Leipzig : Universitätsbibliothek Leipzig, 2014. http://d-nb.info/1238789293/34.

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9

Chang, Yuyang. "Développement d'un nouvelle technique de mesure du profil atmosphérique en aérosols à l'aide d'un lidar Raman-dépolarisation-fluorescence." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDSMRE/2023/2023ULILR060.pdf.

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La connaissance de la répartition verticale des propriétés optiques et microphysiques des aérosols est cruciale pour étudier l'évolution et le transport des aérosols, ainsi que leurs impacts sur la santé humaine, l'environnement local et le climat mondial. Dans ce travail nous avons développé un algorithme BOREAL pour restituer les propriétés microphysiques des aérosols à partir de combinaisons de mesures lidar d'extinction, de rétrodiffusion et de dépolarisation spectrales. Basé sur une estimation de vraisemblance maximale, l'algorithme de restitution utilise une approche d'itération non liné

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10

Ridley, David A. "Aerosol Radiative Properties Analysed using Global Models of Aerosol Microphysics." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494262.

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11

Karol, Yana. "Determination of optical and microphysical properties of atmospheric aerosols from multi-wavelength airborne sun photometer." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10137/document.

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Les aérosols atmosphériques constituent l’une des plus grandes incertitudes dans l’étude des processus de changement climatique. La diversité des leurs sources et mécanismes de formation rendent la distribution spatiale des aérosols très inhomogène ce qui nécessite la mise en place d’une instrumentation et de méthodes d’observation sophistiquées. Un nouveau photomètre solaire aéroporté PLASMA permet d’effectuer des mesures d’épaisseur optique des aérosols sur une large gamme spectrale (0.34−2.25 μm) et à différentes altitudes. La détermination de la distribution verticale des propriétés optiqu

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12

Karol, Yana. "Determination of optical and microphysical properties of atmospheric aerosols from multi-wavelength airborne sun photometer." Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10137.

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Les aérosols atmosphériques constituent l’une des plus grandes incertitudes dans l’étude des processus de changement climatique. La diversité des leurs sources et mécanismes de formation rendent la distribution spatiale des aérosols très inhomogène ce qui nécessite la mise en place d’une instrumentation et de méthodes d’observation sophistiquées. Un nouveau photomètre solaire aéroporté PLASMA permet d’effectuer des mesures d’épaisseur optique des aérosols sur une large gamme spectrale (0.34−2.25 μm) et à différentes altitudes. La détermination de la distribution verticale des propriétés optiqu

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13

Gasteiger, Josef Konrad. "Retrieval of microphysical properties of desert dust and volcanic ash aerosols from ground-based remote sensing." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-137867.

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14

Morales, Betancourt Ricardo. "On the representation of sub-grid scale phenomena and its impact on clouds properties and climate." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50373.

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This thesis addresses a series of questions related to the problem of achieving reliable and physically consistent representations of aerosol-cloud interaction in global circulation models (GCM). In-situ data and modeling tools are used to develop and evaluate novel parameterization schemes for the process of aerosol activation for applications in GCM simulations. Atmospheric models of different complexity were utilized, ranging from detailed Lagrangian parcel model simulations of the condensational growth of droplets, to one-dimensional single column model with aerosol and cloud microphysics

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15

Targino, Admir Créso. "Regional studies of the optical, chemical and microphysical properties of atmospheric aerosols : Radiative impacts and cloud formation." Doctoral thesis, Stockholm University, Department of Meteorology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-740.

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<p>Atmospheric particles are ubiquitous in the Earth’s atmosphere and have potential to influence atmospheric chemistry, visibility, global climate and human health, particularly downwind from major pollution sources. The main objective of this thesis was to investigate questions pertaining to the microphysical, chemical and optical properties of aerosol particles by using in situ data collected during four experiments carried out in different regions of the Northern Hemisphere.</p><p>The first two papers of this thesis reports on airborne measurements of the aerosol optical properties perform

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16

Targino, Admir Creso. "Regional studies of the optical, chemical and microphysical properties of atmospheric aerosols : radiative impacts and cloud formation /." Stockholm : Dept. of meteorology, Stockholm university, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-740.

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17

Chen, Wei-Ting Wennberg Paul O. Seinfeld John H. "I. Global simulations of interactions between aerosols and future climate and ; II. Sensitivity of multiangle imaging to the optical and microphysical properties of biomass burning aerosols /." Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-12182008-174607.

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18

Lafrique, Pierre. "Lidar multispectral pour la caractérisation des aérosols." Thesis, Toulouse, ISAE, 2015. http://www.theses.fr/2015ESAE0033/document.

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Cette thèse vise à montrer rapport d'un lidar multispectral, en particulier en ajoutant des longueurs d'onde dans le proche infrarouge proche, pour la caractérisation des aérosols. En effet par rapport à un lidar mono-longueur d'onde, l'information contenue dans les profils multispectraux permet de remonter aux propriétés microphysiques des aérosols (distribution en aille et composition). Pour cela un simulateur de signaux lidar multispectraux a été adapté à notre étude afin de pouvoir développer et tester deux méthodes permettant de retrouver les propriétés microphysiques des aérosols le long

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19

Gasteiger, Josef Konrad [Verfasser], and Bernhard [Akademischer Betreuer] Mayer. "Retrieval of microphysical properties of desert dust and volcanic ash aerosols from ground-based remote sensing / Josef Konrad Gasteiger. Betreuer: Bernhard Mayer." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2011. http://d-nb.info/1018847170/34.

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20

Korgo, Bruno. "Caractérisation optique et microphysique des aérosols atmosphériques en zone urbaine ouest africaine : application aux calculs du forçage radiatif à Ouagadougou." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22509/document.

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Dans cette thèse, nous analysons les principales caractéristiques des aérosols atmosphériques sur un site urbain en Afrique de l’Ouest : la ville de Ouagadougou. Cette analyse est suivie de l’évaluation du forçage radiatif produit par cette population d’aérosols au sommet de l’atmosphère, dans la couche atmosphérique ainsi qu’à la surface terrestre. Une étude climatologique des propriétés optiques (épaisseurs optiques, exposant d’Angström, albédo de simple diffusion, facteur d’asymétrie) et microphysiques (distribution granulométrique, indice complexe de réfraction) a été effectuée sur la base

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21

Hamburger, Thomas [Verfasser]. "Aerosol microphysical properties during anticyclonic flow conditions over Europe / vorgelegt von Thomas Hamburger." 2010. http://d-nb.info/1011054582/34.

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22

Lee, Keun-Hee. "Modeling the Direct and Indirect Effects of Atmospheric Aerosols on Tropical Cyclones." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10390.

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The direct and indirect effects of aerosols on the hurricane ‘Katrina’ have been investigated using the WRF model with a two-moment bulk microphysical scheme and modified Goddard shortwave radiation scheme. Simulations of the hurricane ‘Katrina’ are conducted under the three aerosol scenarios: 1) the clean case with an aerosol number concentration of 200 cm-1, 2) the polluted case with a number concentration of 1000 cm-1, and 3) the aerosol radiative effects (AR) case with same aerosol concentration as polluted case but with a modified shortwave radiation scheme. The polluted and AR cases ha

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23

Chen, Wei-Ting. "I. Global Simulations of Interactions between Aerosols and Future Climate and II. Sensitivity of Multiangle Imaging to the Optical and Microphysical Properties of Biomass Burning Aerosols." Thesis, 2009. https://thesis.library.caltech.edu/5060/1/Thesis_2side.pdf.

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To understand the interaction between aerosols and climate, equilibrium simulations with a general circulation model are carried out in Part I to study the effects of future climate change on aerosol distributions, as well as the climate responses to future aerosol changes. The predicted warmer climate induced by carbon dioxide modifies the climate-sensitive emissions, alters the thermodynamic partitioning, and enhances wet removal of the aerosols. The direct radiative perturbations of aerosols, and the modification of clouds by aerosols can potentially change the temperature distribution, the

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