Airborne lidar observations of tropospheric arctic clouds
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 backs...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:3940 2023-05-15T13:15:46+02:00 Airborne lidar observations of tropospheric arctic clouds Flugzeuggetragene Lidar-Beobachtung von troposphärischen arktischen Wolken Lampert, Astrid 2010-02-11 application/pdf https://publishup.uni-potsdam.de/frontdoor/index/index/docId/3940 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-41211 https://publishup.uni-potsdam.de/files/3940/lampert_diss.pdf eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/3940 urn:nbn:de:kobv:517-opus-41211 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-41211 https://publishup.uni-potsdam.de/files/3940/lampert_diss.pdf https://creativecommons.org/licenses/by-nc-sa/3.0/de/ info:eu-repo/semantics/openAccess CC-BY-NC-SA ddc:530 Institut für Physik und Astronomie doctoralthesis doc-type:doctoralThesis 2010 ftubpotsdam 2022-08-28T22:31:51Z 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 instruments: The Airborne Mobile Aerosol Lidar (AMALi) of the Alfred Wegener Institute for Polar and Marine Research provided information on the vertical and horizontal extent of clouds along the flight track, optical properties (backscatter coefficient), and cloud thermodynamic phase. From the data obtained by the spectral albedometer (University of Mainz), the cloud phase and cloud optical thickness was deduced. Furthermore, in situ observations with the Polar Nephelometer, Cloud Particle Imager and Forward Scattering Spectrometer Probe (Laboratoire de Météorologie Physique, France) provided information on the microphysical properties, cloud particle size and shape, concentration, extinction, liquid and ice water content. In the thesis, a data set of four flights is analyzed and interpreted. The lidar observations served to detect atmospheric structures of interest, which were then probed by in situ technique. With this method, an optically subvisible ice cloud was characterized by the ensemble of instruments (10 April 2007). Radiative transfer simulations based on the lidar, radiation and in situ measurements allowed the calculation of the cloud forcing, amounting to -0.4 W m-2. This slight surface cooling is negligible on a local scale. However, thin Arctic clouds have been reported more frequently in winter time, when the clouds' effect on longwave radiation (a surface warming of 2.8 W m-2) is not balanced by the reduced ... Doctoral or Postdoctoral Thesis Alfred Wegener Institute Arctic Arctic Ocean Arktis* Svalbard University of Potsdam: publish.UP Arctic Arctic Ocean Svalbard |
institution |
Open Polar |
collection |
University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
ddc:530 Institut für Physik und Astronomie |
spellingShingle |
ddc:530 Institut für Physik und Astronomie Lampert, Astrid Airborne lidar observations of tropospheric arctic clouds |
topic_facet |
ddc:530 Institut für Physik und Astronomie |
description |
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 instruments: The Airborne Mobile Aerosol Lidar (AMALi) of the Alfred Wegener Institute for Polar and Marine Research provided information on the vertical and horizontal extent of clouds along the flight track, optical properties (backscatter coefficient), and cloud thermodynamic phase. From the data obtained by the spectral albedometer (University of Mainz), the cloud phase and cloud optical thickness was deduced. Furthermore, in situ observations with the Polar Nephelometer, Cloud Particle Imager and Forward Scattering Spectrometer Probe (Laboratoire de Météorologie Physique, France) provided information on the microphysical properties, cloud particle size and shape, concentration, extinction, liquid and ice water content. In the thesis, a data set of four flights is analyzed and interpreted. The lidar observations served to detect atmospheric structures of interest, which were then probed by in situ technique. With this method, an optically subvisible ice cloud was characterized by the ensemble of instruments (10 April 2007). Radiative transfer simulations based on the lidar, radiation and in situ measurements allowed the calculation of the cloud forcing, amounting to -0.4 W m-2. This slight surface cooling is negligible on a local scale. However, thin Arctic clouds have been reported more frequently in winter time, when the clouds' effect on longwave radiation (a surface warming of 2.8 W m-2) is not balanced by the reduced ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Lampert, Astrid |
author_facet |
Lampert, Astrid |
author_sort |
Lampert, Astrid |
title |
Airborne lidar observations of tropospheric arctic clouds |
title_short |
Airborne lidar observations of tropospheric arctic clouds |
title_full |
Airborne lidar observations of tropospheric arctic clouds |
title_fullStr |
Airborne lidar observations of tropospheric arctic clouds |
title_full_unstemmed |
Airborne lidar observations of tropospheric arctic clouds |
title_sort |
airborne lidar observations of tropospheric arctic clouds |
publishDate |
2010 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/3940 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-41211 https://publishup.uni-potsdam.de/files/3940/lampert_diss.pdf |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Alfred Wegener Institute Arctic Arctic Ocean Arktis* Svalbard |
genre_facet |
Alfred Wegener Institute Arctic Arctic Ocean Arktis* Svalbard |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/3940 urn:nbn:de:kobv:517-opus-41211 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus-41211 https://publishup.uni-potsdam.de/files/3940/lampert_diss.pdf |
op_rights |
https://creativecommons.org/licenses/by-nc-sa/3.0/de/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-SA |
_version_ |
1766270923633065984 |