Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard
Multilayer clouds (MLCs) occur more often in the Arctic than globally. In this study we present the results of a detection algorithm applied to radiosonde and radar data from an 1-year time period in Ny-Ålesund, Svalbard. Multilayer cloud occurrence is found on 29 % of the investigated days. These m...
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Copernicus Publications
2019
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00002657 2023-05-15T15:00:41+02:00 Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard Vassel, Maiken Ickes, Luisa Maturilli, Marion Hoose, Corinna 2019-04 electronic https://doi.org/10.5194/acp-19-5111-2019 https://noa.gwlb.de/receive/cop_mods_00002657 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00002615/acp-19-5111-2019.pdf https://acp.copernicus.org/articles/19/5111/2019/acp-19-5111-2019.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-19-5111-2019 https://noa.gwlb.de/receive/cop_mods_00002657 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00002615/acp-19-5111-2019.pdf https://acp.copernicus.org/articles/19/5111/2019/acp-19-5111-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/acp-19-5111-2019 2022-02-08T23:00:59Z Multilayer clouds (MLCs) occur more often in the Arctic than globally. In this study we present the results of a detection algorithm applied to radiosonde and radar data from an 1-year time period in Ny-Ålesund, Svalbard. Multilayer cloud occurrence is found on 29 % of the investigated days. These multilayer cloud cases are further analysed regarding the possibility of ice crystal seeding, meaning that an ice crystal can survive sublimation in a subsaturated layer between two cloud layers when falling through this layer. For this we analyse profiles of relative humidity with respect to ice to identify super- and subsaturated air layers. Then the sublimation of an ice crystal of an assumed initial size of r=400 µm on its way through the subsaturated layer is calculated. If the ice crystal still exists when reaching a lower supersaturated layer, ice crystal seeding can potentially take place. Seeding cases are found often, in 23 % of the investigated days (100 % includes all days, as well as non-cloudy days). The identification of seeding cases is limited by the radar signal inside the subsaturated layer. Clearly separated multilayer clouds, defined by a clear interstice in the radar image, do not interact through seeding (9 % of the investigated days). There are various deviations between the relative humidity profiles and the radar images, e.g. due to the lack of ice-nucleating particles (INPs) and cloud condensation nuclei (CCN). Additionally, horizontal wind drift of the radiosonde and time restriction when comparing radiosonde and radar data cause further deviations. In order to account for some of these deviations, an evaluation by manual visual inspection is done for the non-seeding cases. Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Svalbard Niedersächsisches Online-Archiv NOA Arctic Ny-Ålesund Svalbard Atmospheric Chemistry and Physics 19 7 5111 5126 |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Vassel, Maiken Ickes, Luisa Maturilli, Marion Hoose, Corinna Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
topic_facet |
article Verlagsveröffentlichung |
description |
Multilayer clouds (MLCs) occur more often in the Arctic than globally. In this study we present the results of a detection algorithm applied to radiosonde and radar data from an 1-year time period in Ny-Ålesund, Svalbard. Multilayer cloud occurrence is found on 29 % of the investigated days. These multilayer cloud cases are further analysed regarding the possibility of ice crystal seeding, meaning that an ice crystal can survive sublimation in a subsaturated layer between two cloud layers when falling through this layer. For this we analyse profiles of relative humidity with respect to ice to identify super- and subsaturated air layers. Then the sublimation of an ice crystal of an assumed initial size of r=400 µm on its way through the subsaturated layer is calculated. If the ice crystal still exists when reaching a lower supersaturated layer, ice crystal seeding can potentially take place. Seeding cases are found often, in 23 % of the investigated days (100 % includes all days, as well as non-cloudy days). The identification of seeding cases is limited by the radar signal inside the subsaturated layer. Clearly separated multilayer clouds, defined by a clear interstice in the radar image, do not interact through seeding (9 % of the investigated days). There are various deviations between the relative humidity profiles and the radar images, e.g. due to the lack of ice-nucleating particles (INPs) and cloud condensation nuclei (CCN). Additionally, horizontal wind drift of the radiosonde and time restriction when comparing radiosonde and radar data cause further deviations. In order to account for some of these deviations, an evaluation by manual visual inspection is done for the non-seeding cases. |
format |
Article in Journal/Newspaper |
author |
Vassel, Maiken Ickes, Luisa Maturilli, Marion Hoose, Corinna |
author_facet |
Vassel, Maiken Ickes, Luisa Maturilli, Marion Hoose, Corinna |
author_sort |
Vassel, Maiken |
title |
Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
title_short |
Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
title_full |
Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
title_fullStr |
Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
title_full_unstemmed |
Classification of Arctic multilayer clouds using radiosonde and radar data in Svalbard |
title_sort |
classification of arctic multilayer clouds using radiosonde and radar data in svalbard |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-19-5111-2019 https://noa.gwlb.de/receive/cop_mods_00002657 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00002615/acp-19-5111-2019.pdf https://acp.copernicus.org/articles/19/5111/2019/acp-19-5111-2019.pdf |
geographic |
Arctic Ny-Ålesund Svalbard |
geographic_facet |
Arctic Ny-Ålesund Svalbard |
genre |
Arctic Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-19-5111-2019 https://noa.gwlb.de/receive/cop_mods_00002657 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00002615/acp-19-5111-2019.pdf https://acp.copernicus.org/articles/19/5111/2019/acp-19-5111-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-19-5111-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
7 |
container_start_page |
5111 |
op_container_end_page |
5126 |
_version_ |
1766332765565878272 |