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Dissertations / Theses on the topic 'Arctic clouds'

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Published: 30 June 2021

Last updated: 29 July 2025

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1

Beesley, John Anthony. "The climatic effects and requirements of arctic clouds /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/10056.

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2

Garrett, Timothy J. "Radiative properties of arctic clouds /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/10090.

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3

Zygmuntowska, Marta, Thorsten Mauritsen, Johannes Quaas, and Lars Kaleschke. "Arctic clouds and surface radiation." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-185357.

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Clouds regulate the Earth’s radiation budget, both by reflecting part of the incoming sunlight leading to cooling and by absorbing and emitting infrared radiation which tends to have a warming effect. Globally averaged, at the top of the atmosphere the cloud radiative effect is to cool the climate, while at the Arctic surface, clouds are thought to be warming. Here we compare a passive instrument, the AVHRR-based retrieval from CM-SAF, with recently launched active instruments onboard CloudSat and CALIPSO and the widely used ERA-Interim reanalysis. We find that in particular in winter months t

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4

Lampert, Astrid. "Airborne lidar observations of tropospheric arctic clouds." Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2010/4121/.

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Due to the unique environmental conditions and different feedback mechanisms, the Arctic region is especially sensitive to climate changes. The influence of clouds on the radiation budget is substantial, but difficult to quantify and parameterize in models. In the framework of the PhD, elastic backscatter and depolarization lidar observations of Arctic clouds were performed during the international Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) from Svalbard in March and April 2007. Clouds were probed above the inaccessible Arctic Ocean with a combination of airborne inst

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5

Pleavin, Thomas Daniel. "Large eddy simulations of Arctic stratus clouds." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/4934/.

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Mixed-phase Arctic stratocumulus clouds are ubiquitous to the region during the summer months. However, despite their prevalence, very little is known about the processes which maintain the cloud. Recent observations have shown that Arctic stratocumulus commonly extend into the temperature inversion which caps the Arctic boundary layer. This is atypical to sub-tropical stratocumulus where the cloud top is found in the vicinity of the inversion base, and unexpected as strong longwave radiative cooling would be expected to keep the cloud top and inversion base heights in equilibrium. Uniquely to

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6

Kanngießer, Franz, André Ehrlich, and Manfred Wendisch. "Observations of glories above arctic boundary layer clouds to identify cloud phase." Universität Leipzig, 2017. https://ul.qucosa.de/id/qucosa%3A16743.

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The glory is an optical phenomenon observed above liquid water clouds and consists of coloured rings around the anti-solar point. Since the glory is caused by scattering on spherical particles it can be used as a proxy to identify liquid water at the cloud top. Images taken with a CANON digital camera equipped with a fish-eye lens on board the research aircraft Polar 5 during the measurement campaign Radiation-Aerosol-Cloud Experiment in the Arctic Circle (RACEPAC) were analysed for glories. To identify glories an algorithm consisting of five criteria was developed by using simulations of the

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7

Poole, Lamont Rozelle. "Airborne lidar studies of Arctic polar stratospheric clouds." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184277.

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Airborne lidar measurements of Arctic polar stratospheric clouds (PSCs) in January 1984 and January 1986 are reported. The locales and altitudes of the clouds coincided in both years with very cold ambient temperatures. During the 1984 experiment, PSCs were observed on three flights north of Thule, Greenland; peak backscatter occurred near 20 km (at temperatures below 193 K). A single PSC formation was seen between Iceland and Scotland during the 1986 experiment, with beak backscatter occurring near 22 km (at temperatures from 188-191 K). A sequence of observations in this same area by the SAM

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8

Lampert, Astrid [Verfasser]. "Airborne lidar observations of tropospheric Arctic clouds / Astrid Lampert." Bremerhaven : AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung, 2010. http://d-nb.info/101019965X/34.

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9

Achtert, Peggy. "Lidar Measurements of Polar Stratospheric Clouds in the Arctic." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-88054.

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Polar Stratospheric Clouds (PSCs) play a key role for ozone depletion in the polar stratosphere. Its magnitude depends on the type of PSC and its lifetime and extent. This thesis presents PSC observations conducted with the Esrange lidar and the space-borne CALIPSO lidar. PSCs are separated into three types according to their optical properties. The occurrence rate of the different types which are often observed simultaneously as well as their interaction and connection is not well understood. To better understand the processes that govern PSC formation, observations need to be combined with a

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10

Cremer, Roxana, Johannes Quaas, and Johannes Mülmenstädt. "Interactions between clouds and sea ice in the Arctic." Universität Leipzig, 2017. https://ul.qucosa.de/id/qucosa%3A16773.

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The feedback between clouds and sea ice got more importance in the last years, because of the declining Arctic sea ice extent. Previous observations show the formation of low clouds over newly formed open water. These low clouds are very important for the Arctic Energy Budget, because they warm the surface. This leads to increasing temperatures and stronger sea ice loss. To assess the relationship between sea ice cover and cloudiness, satellite observations by DARDAR were compared with both global climate reanalyses ERA–Interim and MACC. The analysis focuses on 2007 – 2010 and the relationship

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11

Young, Gillian. "Understanding the nucleation of ice particles in polar clouds." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/understanding-the-nucleation-of-ice-particles-in-polar-clouds(4f80f81b-ed06-480a-944b-6e3594ba8471).html.

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Arctic clouds are poorly represented in numerical models due to the complex, small-scale interactions which occur within them. Modelled cloud fractions are often significantly less than observed in this region; therefore, the radiative budget is not accurately simulated and forecasts of the melting cryosphere are fraught with uncertainty. Our ability to accurately model Arctic clouds can be improved through observational studies. Recent in situ airborne measurements from the springtime Aerosol-Cloud Coupling and Climate Interactions in the Arctic (ACCACIA) campaign are presented in this thesis

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12

Ehrlich, André, Eike Bierwirth, and Manfred Wendisch. "Airborne remote sensing of Arctic boundary-layer mixed-phase clouds." Universität Leipzig, 2010. https://ul.qucosa.de/id/qucosa%3A16357.

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This article gives an overview on the investigations on Artic boundary-layer mixed-phase clouds conducted within the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) in spring 2007. In particular the horizontal and vertical disribution of ice crystals within the clouds was determined by three independent airborne instruments (lidar, in situ and solar radiation measurements). Spectral measurements of cloud top reflectivity have been utilized to retrieve information on the ice phase by analyzing the spectral pattern of the cloud top reflectance in the wavelength range dominated

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13

Sotiropoulou, Georgia. "The Arctic Atmosphere : Interactions between clouds, boundary-layer turbulence and large-scale circulation." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-134525.

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Arctic climate is changing fast, but weather forecast and climate models have serious deficiencies in representing the Arctic atmosphere, because of the special conditions that occur in this region. The cold ice surface and the advection of warm air aloft from the south result in a semi-continuous presence of a temperature inversion, known as the “Arctic inversion”, which is governed by interacting large-scale and local processes, such as surface fluxes and cloud formation. In this thesis these poorly understood interactions are investigated using observations from field campaigns on the Swedi

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14

Kripchak, Kristopher J. "Cloud phase and the surface energy balance of the arctic an investigation of mixed-phase clouds." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FKripchak.pdf.

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Thesis (M.S. in Meterology)--Naval Postgraduate School, March 2008.<br>Thesis Advisor(s): Guest, Peter. "March 2008." Description based on title screen as viewed on May 1, 2008. Includes bibliographical references (p. 59-61). Also available in print.

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15

Schäfer, Michael, Eike Bierwirth, André Ehrlich, Evi Jäkel, and Manfred Wendisch. "Three-dimensional radiative effects in Arctic boundary layer clouds above ice edges." Universität Leipzig, 2015. https://ul.qucosa.de/id/qucosa%3A16651.

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Based on airborne spectral imaging observations, three-dimensional (3-D) radiative effects between Arctic boundary layer clouds and highly variable Arctic surfaces have been identified and quantified. A method is presented to discriminate sea ice and open water in cloudy conditions based on airborne upward radiance measurements in the visible spectral range. This separation simultaneously reveals that the transition of radiance between open water and sea ice is not instantaneous in cloudy conditions but horizontally smoothed. In general, clouds reduce the nadir radiance above bright surfaces i

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16

Lauermann, Felix, Fanny Finger, André Ehrlich, and Manfred Wendisch. "Analysis of Water Content Profiles in Arctic Mixed-Phase Clouds during VERDI." Universität Leipzig, 2016. https://ul.qucosa.de/id/qucosa%3A16700.

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Airborne measurements of liquid water content (LWC) and ice water content (IWC) were performed in mixed-phase clouds during the field campaign VERDI in Canada in April and May 2012. In single-layer and multi-layer clouds different vertical profiles of LWC and IWC could be observed. For single layer clouds the maximum LWC occurred in the upper half of the clouds while the IWC had a maximum near the cloud base. This pattern was attributed to the sedimentation of ice particles. In the lowest cloud layer of a multi-layer system both LWC and IWC reached a maximum near cloud top. Together with measu

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17

Stachlewska, Iwona Sylwia. "Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2006/698/.

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An Airborne Mobile Aerosol Lidar (AMALi) was constructed and built at Alfred-Wegener-Institute for Polar and Marine Research (AWI) in Potsdam, Germany for the lower tropospheric aerosol and cloud research under tough arctic conditions. The system was successfully used during two AWI airborne field campaigns, ASTAR 2004 and SVALEX 2005, performed in vicinity of Spitsbergen in the Arctic. The novel evaluation schemes, the Two-Stream Inversion and the Iterative Airborne Inversion, were applied to the obtained lidar data. Thereby, calculation of the particle extinction and backscatter coefficient

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18

Loewe, Katharina [Verfasser]. "Arctic mixed-phase clouds : Macro- and microphysical insights with a numerical model / Katharina Loewe." Karlsruhe : KIT Scientific Publishing, 2017. http://www.ksp.kit.edu.

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19

Zygmuntowska, Marta, Thorsten Mauritsen, Johannes Quaas, and Lars Kaleschke. "Arctic clouds and surface radiation: a critical comparison of satellite retrievals and the ERA-Interim reanalysis." Atmospheric chemistry and physics (2012) 12, S. 6667-6677, 2012. https://ul.qucosa.de/id/qucosa%3A13793.

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Clouds regulate the Earth’s radiation budget, both by reflecting part of the incoming sunlight leading to cooling and by absorbing and emitting infrared radiation which tends to have a warming effect. Globally averaged, at the top of the atmosphere the cloud radiative effect is to cool the climate, while at the Arctic surface, clouds are thought to be warming. Here we compare a passive instrument, the AVHRR-based retrieval from CM-SAF, with recently launched active instruments onboard CloudSat and CALIPSO and the widely used ERA-Interim reanalysis. We find that in particular in winter months t

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20

Humpage, Neil. "Observing and modelling the impact of arctic and tropical cirrus clouds on far-infrared radiance spectra." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5652.

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The work described in this thesis concerns the effect of cirrus clouds on far-infrared (FIR) radiance spectra. Though the importance of both FIR radiation and cirrus clouds to the Earth’s energy budget is well recognised, few high spectral resolution measurements have been made at FIR wavelengths to date. Observations taken during two diverse field campaigns, along with spectra simulated using a radiative transfer model, are used here to investi- gate the FIR signature of cirrus. The FIR observations presented are made using the TAFTS spectrometer, which measures spectral radiances from ei- th

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21

Guyot, Gwennolé. "Caractérisation des propriétés microphysiques des nuages et de l'interaction aérosol-nuage en Arctique à partir de mesures in-situ au sol pendant la campagne CLIMSLIP-NyA, Svalbard." Thesis, Clermont-Ferrand 2, 2016. http://www.theses.fr/2016CLF22699/document.

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La région arctique est particulièrement sensible au changement climatique. Aux latitudes polaires, les nuages arctiques ont un effet important sur le bilan radiatif à la surface. La première partie de ce travail est constitué de l’intercomparaison instrumentale au sol à la station PUY en Mai 2013. Les mesures ont montré une bonne corrélation entre les diamètres effectifs et les distributions en taille des gouttelettes d’eau obtenus par les instruments, mais avec des biais systématiques sur les concentrations. Ces biais ont été reliés à l’estimation du volume d’échantillonnage et nous avons don

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22

Schäfer, Michael, Katharina Loewe, André Ehrlich, Corinna Hoose, and Manfred Wendisch. "Comparison of simulated and observed horizontal inhomogeneities of optical thickness of Arctic stratus." Universität Leipzig, 2019. https://ul.qucosa.de/id/qucosa%3A74176.

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Two-dimensional horizontal fields of cloud optical thickness derived from airborne measurements of solar spectral, reflected radiance are compared with semiidealized large eddy simulations (LESs) of Arctic stratus performed with the Consortium for Small-scale Modeling (COSMO) atmospheric model. The measurements were collected during the Vertical Distribution of Ice in Arctic Clouds (VERDI) campaign carried out in Inuvik, Canada, in April/May 2012. The input for the LESs is obtained from collocated dropsonde observations of a persistent Arctic stratus above the sea-icefree Beaufort Sea. Simulat

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23

Shupe, Matthew David. "An intricate balance of liquid and ice: The properties, processes, and significance of Arctic stratiform mixed-phase clouds." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3284464.

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24

Lloyd, Gary James. "Observations of the origin and distribution of primary and secondary ice in clouds." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/observations-of-the-origin-and-distribution-of-primary-and-secondary-ice-in-clouds(fbe41932-ddf0-49c2-b634-89575e919037).html.

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A detailed understanding of cloud microphysical processes is crucial for a large range of scientific disciplines that require knowledge of cloud particles for accurate climate and weather prediction. This thesis focuses on 3 measurement campaigns, encompassing both airborne and ground based measurements of the microphysical structures observed in cold, warm and occluded frontal systems around the United Kingdom, stratocumulus clouds in the Arctic and many different clouds observed over a 6 week period at a high-alpine site in the Swiss Alps. Particular attention was paid to the origin and dist

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25

Mariage, Vincent. "Développement et mise en oeuvre de LiDAR embarqués sur bouées dérivantes pour l'étude des propriétés des aérosols et des nuages en Arctique et des forçages radiatifs induits." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066580/document.

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Afin de mieux comprendre les processus et les interactions entre l'atmosphère, la glace de mer et l'océan en arctique, un financement EQUIPEX a permis de développer et déployer le projet IAOOS (Ice-Atmosphere-Ocean-Observing-System) de réseau de bouées multi-instrumentées. Pour la partie atmosphère un LiDAR rétrodiffusion innovant a été développé pour répondre aux contraintes du projet et de l'environnement arctique. Un modèle analytique du rapport signal sur bruit en air clair a permis de préciser les paramètres clés de la conception. Des simulations numériques ont ensuite permis d'affiner le

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26

Maillard, Julia. "Boundary layer processes impacting the surface energy balance in the Arctic." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS515.pdf.

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L'Arctique se réchauffe deux à trois fois plus vite que le reste de la Terre, et c'est donc une zone d'étude cruciale des sciences de l'atmosphère. Cette thèse a pour but d'étudier deux caractéristiques de la couche limite de l'Arctique (les nuages et les inversions de température en surface) et de déterminer leur impact sur le bilan d'énergie de surface en combinant observations et modélisation. Tout d'abord, une nouvelle statistique des caractéristiques nuageuses au-dessus de la banquise a été dérivée d'un ensemble de 1777 profils lidar obtenus au cours de la campagne Ice, Atmosphere, Ocean

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27

Guest, Peter Staples. "A numerical, analytical and observational study of the effect of clouds on surface wind and wind stress during the central Arctic winter." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23734.

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28

Mariage, Vincent. "Développement et mise en oeuvre de LiDAR embarqués sur bouées dérivantes pour l'étude des propriétés des aérosols et des nuages en Arctique et des forçages radiatifs induits." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066580.

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Afin de mieux comprendre les processus et les interactions entre l'atmosphère, la glace de mer et l'océan en arctique, un financement EQUIPEX a permis de développer et déployer le projet IAOOS (Ice-Atmosphere-Ocean-Observing-System) de réseau de bouées multi-instrumentées. Pour la partie atmosphère un LiDAR rétrodiffusion innovant a été développé pour répondre aux contraintes du projet et de l'environnement arctique. Un modèle analytique du rapport signal sur bruit en air clair a permis de préciser les paramètres clés de la conception. Des simulations numériques ont ensuite permis d'affiner le

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29

Petersson, Sofie. "Arktiska molns påverkan på havsisens utbredning och minskning." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-326014.

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Klimatförändringarna i Arktis sker i en snabbare takt än någon annanstans på jorden. I regionen är det framförallt havsisens utbredning som drabbas, vilken har minskat med 3.8 % av medelstorleken per decennium under åren 1979-2012. För att klimatmodellerna ska kunna göra så bra beräkningar som möjligt av det framtida klimatet behövs mer observationsdata och bättre förståelse av Arktis klimatsystem. Det arktiska klimatet är komplext, svåråtkomligt för observationer och därför mindre utforskat än klimatsystemen på resten av jorden. Detta gör att klimatmodellerna i nulä

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30

Loyer, Lilian. "Étude de processus-clés de la couche limite nuageuse en Arctique." Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS251.

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L’étude de l’atmosphère arctique présente un intérêt scientifique grandissant, la température de sa surface augmentant deux à trois plus fois rapidement que dans le reste du monde. Par la modulation qu’ils exercent sur le rayonnement, les nuages apparaissent comme un élément crucial du bilan d’énergie du système océan-glace-atmosphère en Arctique. Pourtant, la formation et la persistance de ces nuages sont toujours mal représentées dans les modèles atmosphériques, de même que la couche limite où ils se forment et résident. Dans le cadre du projet innovant IAOOS, un système d’observation intégr

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31

Maroon, Elizabeth A. "The impact of Arctic cloud water and ice on cloud radiative forcing during the Arctic Summer Cloud-Ocean Study in August 2008." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/114379.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 49-52).<br>The Arctic atmosphere is especially sensitive to changes in climate forcing; however, Arctic processes and feedbacks are not understood well enough to accurately predict how the Arctic environment might change under anthropogenic forcing. Further study of the basic atmospheric processes is needed, especially due to uncertainties in modeling cloud feedbacks. August and September are

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32

Fargey, Shannon. "Characterization of orographic cloud and precipitation features over southern Baffin Island and surrounding area." Taylor & Francis Publishing, 2014. http://hdl.handle.net/1993/23730.

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Improved characterization of cloud and precipitation features are required to understand the impact of a changing climate in high latitude regions and accurately represent these features in models. The importance of cold season precipitation to regional moisture cycling and our limited understanding of orographic cloud and precipitation processes in the Arctic provide the motivation for this research. Using high-resolution datasets collected during the Storm Studies in the Arctic (STAR) field project this thesis examines cloud and precipitation features over southern Baffin Island in Nunavut.

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Jouan, Caroline. "Les nuages de glace en arctique : mécanismes de formation." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00843520.

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Les mécanismes de formation des nuages de glace arctiques durant la nuit polaire sont encore mal définis en raison de l'absence d'observations et de l'éloignement de cette région. Pourtant, leur influence sur les conditions météorologiques et sur le climat dans l'hémisphère nord est d'une importance primordiale ; et les connaissances sur la modification de leurs propriétés, liées à des processus d'interaction aérosol-nuage, doivent être améliorées. Les fortes concentrations d'aérosols en Arctique durant la nuit polaire sont associées au transport des aérosols anthropiques des latitudes moyenne

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Barron, John P. "An objective technique for Arctic cloud analysis using multispectral AVHRR satellite imagery." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23335.

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Approved for public release; distribution is unlimited.<br>An established cloud analysis routine has been modified for use in the Arctic. The separation of clouds from the snow and sea ice backgrounds is accomplished through a multispectral technique which utilizes VHRR channel 2 (visible), channel 3 (near infrared) and channel 4 (infrared) data. The primary means of cloud identification is based on a derived channel 3 reflectance image. At this wavelength, a significant contrast exists between liquid clouds and the arctic backgrounds, unlike in the standard visible and infrared images. The ch

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35

Salvato, Gregory. "Comparison between Arctic and subtropic ship exaust [i.e. exhaust] effects on cloud properties." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23838.

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36

Huang, Yiyi, Xiquan Dong, Baike Xi, Erica K. Dolinar, Ryan E. Stanfield, and Shaoyue Qiu. "Quantifying the Uncertainties of Reanalyzed Arctic Cloud and Radiation Properties Using Satellite Surface Observations." AMER METEOROLOGICAL SOC, 2017. http://hdl.handle.net/10150/625985.

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Reanalyses have proven to be convenient tools for studying the Arctic climate system, but their uncertainties should first be identified. In this study, five reanalyses (JRA-55, 20CRv2c, CFSR, ERA-Interim, and MERRA-2) are compared with NASA CERES-MODIS (CM)-derived cloud fractions (CFs), cloud water paths (CWPs), top-of-atmosphere (TOA) and surface longwave (LW) and shortwave (SW) radiative fluxes over the Arctic (70 degrees-90 degrees N) over the period of 2000-12, and CloudSat-CALIPSO (CC)-derived CFs from 2006 to 2010. The monthly mean CFs in all reanalyses except JRA-55 are close to or sl

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37

Arouf, Assia. "Surface longwave cloud radiative effect derived from space lidar observations : application in the Arctic." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS173.

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Les nuages jouent un rôle important dans la régulation du bilan énergétique à la surface de la Terre. Par exemple, ils absorbent le rayonnement tellurique émis par la surface de la Terre et le réémettent vers la surface, réchauffant ainsi cette dernière. Ce réchauffement peut être quantifié au travers de l’effet radiatif des nuages (Cloud Radiative Effect (CRE)) infrarouge (LongWave (LW)) à la surface. Cependant, il n’est pas bien connu en tout point du globe et sa variabilité instantané et interdécennale est mal connue. En effet, il dépend fortement de la distribution verticale des nuages qui

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Huang, Yiyi, Xiquan Dong, Baike Xi, Erica K. Dolinar, and Ryan E. Stanfield. "The footprints of 16 year trends of Arctic springtime cloud and radiation properties on September sea ice retreat." AMER GEOPHYSICAL UNION, 2017. http://hdl.handle.net/10150/623224.

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The most prominent September Arctic sea ice decline over the period of 2000-2015 occurs over the Siberian Sea, Laptev Sea, and Kara Sea. The satellite observed and retrieved sea ice concentration (SIC) and cloud/radiation properties over the Arctic (70 degrees-90 degrees N) have been used to investigate the impact of springtime cloud and radiation properties on September SIC variation. Positive trends of cloud fractions, cloud water paths, and surface downward longwave flux at the surface over the September sea ice retreat areas are found over the period of 1 March to 14 May, while negative tr

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Nomokonova, Tatiana [Verfasser], Ulrich [Gutachter] Löhnert, and Roel A. J. [Gutachter] Neggers. "Arctic cloud properties derived from ground-based sensor synergy at Ny-Ålesund / Tatiana Nomokonova ; Gutachter: Ulrich Löhnert, Roel A. J. Neggers." Köln : Universitäts- und Stadtbibliothek Köln, 2020. http://d-nb.info/1216241074/34.

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Gao, Qiuju. "Marine biogenic polysaccharides as a potential source of aerosol in the high Arctic : Towards a link between marine biology and cloud formation." Doctoral thesis, Stockholms universitet, Meteorologiska institutionen (MISU), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-72433.

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Primary marine aerosol particles containing biogenic polymer microgels play a potential role for cloud formation in the pristine high Arctic summer. One of the major sources of the polymer gels in Arctic aerosol was suggested to be the surface water and more specifically, the surface microlayer (SML) of the open leads within the perennial sea ice as a result of bubble bursting at the air-sea interface. Phytoplankton and/or ice algae are believed to be the main origins of the polymer gels. In this thesis, we examine the chemical composition of biogenic polymers, with focus on polysaccharides,

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Schäfer, Michael. "Optical Thickness Retrievals of Subtropical Cirrus and Arctic Stratus from Ground-Based and Airborne Radiance Observations Using Imaging Spectrometers." Doctoral thesis, Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-207395.

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The development and application of new cloud retrieval methods from ground–based and airborne measurements of spectral radiance fields above heteorogeneous surfaces is introduced. The potential of imaging spectrometers in remote–sensing applications is evaluated. The analyzed spectral radiance fields were measured during two international field campaigns in the visible wavelength range (400–970 nm) with high spatial (<10m) resolution. From ground–based measurements, high ice clouds were observed and from airborne measurements Arctic stratus. From the measurements, cloud optical thickness is

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Willig, Judith A. (Judith Ann) 1953. "Paleo-archaic broad spectrum adaptations at the Pleistocene-Holocene boundary in Far Western North America." Thesis, University of Oregon, 1989. http://hdl.handle.net/1794/9220.

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xx, 463 p. : ill., maps. Two print copies of this title are available through the UO Libraries under the call number: KNIGHT E61 .W72 1989<br>Western Clovis and Western Stemmed cultural traditions, archaeologically indexed by fluted (Clovis) and stemmed projectile point complexes, represent the earliest human occupation documented in Far Western North America. The temporal closeness of Western Clovis, dated roughly from 11,500 to 11,000 B.P., to Western Stemmed complexes known as early as 11,140 to 10,800 B.P., has generated debate over the age and historical relationship of these culture

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Whitman, Derek C. "Investigating Virtual Globes for a Prototype Community Archive of 3D Subsurface Data." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4105.

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Geoscience data sharing and processing is very advanced in terms of surface data. Subsurface data sharing has not received the attention that surface data sharing has received and so there are fewer applications or software packages which focus on it. This research is funded by the NSF EarthCube GEO Domain program in an effort to develop a continental-scale repository of 3D subsurface data to facilitate the sharing of complex 3D data and to enable the development of geoprocessing tools and workflows that operate on that data. The work in this thesis is a small part of the EarthCube project wit

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Lampert, Astrid [Verfasser]. "Airborne lidar observations of tropospheric arctic clouds / von Astrid Lampert." 2009. http://d-nb.info/1001474341/34.

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Candlish, Lauren. "An investigation of atmospheric temperature, humidity and cloud detection techniques over the Arctic marine cryosphere." 2011. http://hdl.handle.net/1993/4489.

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The veracity of a Radiometric Microwave Profiling Radiometer (MWRP) while mounted onboard a ship in the Arctic marine environment was assessed. The MWRP was validated against radiosonde data by calculating the RMS and bias for simultaneous measurements taken for temperature and absolute humidity profiles. The vertical resolution of the MWRP was calculated using the inter-level covariance method. Based on the comparisons, the MWRP provided reliable measurements of both temperature and absolute humidity while mounted on the CCGS Amundsen. Satellites CloudSat and Calipso were assessed over the

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Kretzschmar, Jan. "Improving the representation of Arctic clouds in atmospheric models across scales using observations." 2021. https://ul.qucosa.de/id/qucosa%3A75240.

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With a nearly twice as strongly pronounced temperature increase compared to that of the Northern Hemisphere, the Arctic is especially susceptible to global climate change. The effect of clouds on the Arctic warming is especially uncertain, which is caused by misrepresented cloud microphysical processes in atmospheric models. This thesis aims at employing a scale- and definition-aware comparison of models and observations and will propose changes how to better parameterize Arctic clouds in atmospheric models. In the first part of this thesis, ECHAM6, which is the atmospheric component of the MP

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Pike-Thackray, Colin. "RECONSTRUCTION OF HIGH ARCTIC WINTER SURFACE ENERGY FLUXES." 2011. http://hdl.handle.net/10222/14167.

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Throughout the late 20th and early 21st century, the global temperature has been on the rise, a process that has been accelerated in the Arctic. The Arctic surface temperatures have risen at a factor of 3 greater rate than the global average, leading to the term Arctic Amplification of climate change. In this study, the enhanced warming of the Arctic, and the enhancement at the Arctic surface in comparison to the warming of the atmosphere aloft, is investigated through a reconstruction of the past surface energy balance by a model driven by downwelling irradiance reconstructed using radiosonde

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Avramov, Alexander Elkov Harrington Jerry Y. "Simulations of aerosol, microphysical and coastal influences on Arctic mixed-phase clouds." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3672/index.html.

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Turner, David D. "Microphysical properties of single and mixed-phase arctic clouds derived from ground-based AERI observations /." 2003. http://www.library.wisc.edu/databases/connect/dissertations.html.

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Stachlewska, Iwona Sylwia [Verfasser]. "Investigation of tropospheric arctic aerosol and mixed-phase clouds using airborne lidar technique / von Iwona Sylwia Stachlewska." 2006. http://d-nb.info/979804183/34.

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