Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements
The atmosphere over the Arctic Ocean is strongly influenced by the distribution of sea ice and open water. Leads in the sea ice produce strong convective fluxes of sensible and latent heat and release aerosol particles into the atmosphere. They increase the occurrence of clouds and modify the struct...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:7507 2023-05-15T13:15:52+02:00 Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements Aerosol und Grenzschichtstruktur über arktischem Meereis anhand von Flugzeuggetragenen Lidar- und Dropsonden- Messungen Schmidt, Lukas 2015-04-13 application/pdf https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/7507 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-75076 https://publishup.uni-potsdam.de/opus4-ubp/files/7507/schmidt_diss.pdf eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/7507 urn:nbn:de:kobv:517-opus4-75076 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-75076 https://publishup.uni-potsdam.de/opus4-ubp/files/7507/schmidt_diss.pdf https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess CC-BY ddc:530 Institut für Physik und Astronomie doctoralthesis doc-type:doctoralThesis 2015 ftubpotsdam 2022-08-21T22:34:08Z The atmosphere over the Arctic Ocean is strongly influenced by the distribution of sea ice and open water. Leads in the sea ice produce strong convective fluxes of sensible and latent heat and release aerosol particles into the atmosphere. They increase the occurrence of clouds and modify the structure and characteristics of the atmospheric boundary layer (ABL) and thereby influence the Arctic climate. In the course of this study aircraft measurements were performed over the western Arctic Ocean as part of the campaign PAMARCMIP 2012 of the Alfred Wegener Institute for Polar and Marine Research (AWI). Backscatter from aerosols and clouds within the lower troposphere and the ABL were measured with the nadir pointing Airborne Mobile Aerosol Lidar (AMALi) and dropsondes were launched to obtain profiles of meteorological variables. Furthermore, in situ measurements of aerosol properties, meteorological variables and turbulence were part of the campaign. The measurements covered a broad range of atmospheric and sea ice conditions. In this thesis, properties of the ABL over Arctic sea ice with a focus on the influence of open leads are studied based on the data from the PAMARCMIP campaign. The height of the ABL is determined by different methods that are applied to dropsonde and AMALi backscatter profiles. ABL heights are compared for different flights representing different conditions of the atmosphere and of sea ice and open water influence. The different criteria for ABL height that are applied show large variation in terms of agreement among each other, depending on the characteristics of the ABL and its history. It is shown that ABL height determination from lidar backscatter by methods commonly used under mid-latitude conditions is applicable to the Arctic ABL only under certain conditions. Aerosol or clouds within the ABL are needed as a tracer for ABL height detection from backscatter. Hence an aerosol source close to the surface is necessary, that is typically found under the present influence of open water ... Doctoral or Postdoctoral Thesis Alfred Wegener Institute Arctic Arctic Ocean Arktis* Sea ice University of Potsdam: publish.UP Arctic Arctic Ocean |
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Open Polar |
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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 Schmidt, Lukas Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
topic_facet |
ddc:530 Institut für Physik und Astronomie |
description |
The atmosphere over the Arctic Ocean is strongly influenced by the distribution of sea ice and open water. Leads in the sea ice produce strong convective fluxes of sensible and latent heat and release aerosol particles into the atmosphere. They increase the occurrence of clouds and modify the structure and characteristics of the atmospheric boundary layer (ABL) and thereby influence the Arctic climate. In the course of this study aircraft measurements were performed over the western Arctic Ocean as part of the campaign PAMARCMIP 2012 of the Alfred Wegener Institute for Polar and Marine Research (AWI). Backscatter from aerosols and clouds within the lower troposphere and the ABL were measured with the nadir pointing Airborne Mobile Aerosol Lidar (AMALi) and dropsondes were launched to obtain profiles of meteorological variables. Furthermore, in situ measurements of aerosol properties, meteorological variables and turbulence were part of the campaign. The measurements covered a broad range of atmospheric and sea ice conditions. In this thesis, properties of the ABL over Arctic sea ice with a focus on the influence of open leads are studied based on the data from the PAMARCMIP campaign. The height of the ABL is determined by different methods that are applied to dropsonde and AMALi backscatter profiles. ABL heights are compared for different flights representing different conditions of the atmosphere and of sea ice and open water influence. The different criteria for ABL height that are applied show large variation in terms of agreement among each other, depending on the characteristics of the ABL and its history. It is shown that ABL height determination from lidar backscatter by methods commonly used under mid-latitude conditions is applicable to the Arctic ABL only under certain conditions. Aerosol or clouds within the ABL are needed as a tracer for ABL height detection from backscatter. Hence an aerosol source close to the surface is necessary, that is typically found under the present influence of open water ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Schmidt, Lukas |
author_facet |
Schmidt, Lukas |
author_sort |
Schmidt, Lukas |
title |
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
title_short |
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
title_full |
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
title_fullStr |
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
title_full_unstemmed |
Aerosols and boundary layer structure over Arctic sea ice based on airborne lidar and dropsonde measurements |
title_sort |
aerosols and boundary layer structure over arctic sea ice based on airborne lidar and dropsonde measurements |
publishDate |
2015 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/7507 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-75076 https://publishup.uni-potsdam.de/opus4-ubp/files/7507/schmidt_diss.pdf |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Alfred Wegener Institute Arctic Arctic Ocean Arktis* Sea ice |
genre_facet |
Alfred Wegener Institute Arctic Arctic Ocean Arktis* Sea ice |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/7507 urn:nbn:de:kobv:517-opus4-75076 https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-75076 https://publishup.uni-potsdam.de/opus4-ubp/files/7507/schmidt_diss.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
_version_ |
1766271591618969600 |