The effects of warm-air intrusions in the high Arctic on cirrus clouds
Warm-air intrusions (WAIs) are responsible for the transportation of warm and moist air masses from the mid-latitudes into the high Arctic (> 70° N). In this work, we study cirrus clouds that form during WAI events (WAI cirrus) and during undisturbed Arctic conditions (AC cirrus) and investigate...
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Copernicus Publications
2024
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00073817 2024-06-23T07:49:44+00:00 The effects of warm-air intrusions in the high Arctic on cirrus clouds Dekoutsidis, Georgios Wirth, Martin Groß, Silke 2024-05 electronic https://doi.org/10.5194/acp-24-5971-2024 https://noa.gwlb.de/receive/cop_mods_00073817 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071960/acp-24-5971-2024.pdf https://acp.copernicus.org/articles/24/5971/2024/acp-24-5971-2024.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-24-5971-2024 https://noa.gwlb.de/receive/cop_mods_00073817 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071960/acp-24-5971-2024.pdf https://acp.copernicus.org/articles/24/5971/2024/acp-24-5971-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/acp-24-5971-2024 2024-05-27T23:38:26Z Warm-air intrusions (WAIs) are responsible for the transportation of warm and moist air masses from the mid-latitudes into the high Arctic (> 70° N). In this work, we study cirrus clouds that form during WAI events (WAI cirrus) and during undisturbed Arctic conditions (AC cirrus) and investigate possible differences between the two cloud types based on their macrophysical and optical properties with a focus on relative humidity over ice (RHi). We use airborne measurements from the combined high-spectral-resolution and differential-absorption lidar, WALES, performed during the HALO-(AC)3 campaign. We classify each research flight and the measured clouds as either AC or WAI, based on the ambient conditions, and study the macrophysical, geometrical and optical characteristics for each cirrus group. As our main parameter we choose the relative humidity over ice (RHi), which we calculate RHi by combining the lidar water vapor measurements with model temperatures. Ice formation occurs at certain RHi values depending on the dominant nucleation process taking place. RHi can thus be used as an indication of the nucleation process and the structure of cirrus clouds. We find that during WAI events the Arctic is warmer and moister and WAI cirrus clouds are both geometrically and optically thicker compared to AC cirrus. WAI cirrus clouds and the layer directly surrounding them are more frequently supersaturated, also at high supersaturations over the threshold for homogeneous ice nucleation (HOM). AC cirrus clouds have a supersaturation-dominated cloud top and a subsaturated cloud base. WAI cirrus clouds also have high supersaturations at cloud top but also at cloud base. Article in Journal/Newspaper Arctic Niedersächsisches Online-Archiv NOA Arctic Atmospheric Chemistry and Physics 24 10 5971 5987 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Dekoutsidis, Georgios Wirth, Martin Groß, Silke The effects of warm-air intrusions in the high Arctic on cirrus clouds |
topic_facet |
article Verlagsveröffentlichung |
description |
Warm-air intrusions (WAIs) are responsible for the transportation of warm and moist air masses from the mid-latitudes into the high Arctic (> 70° N). In this work, we study cirrus clouds that form during WAI events (WAI cirrus) and during undisturbed Arctic conditions (AC cirrus) and investigate possible differences between the two cloud types based on their macrophysical and optical properties with a focus on relative humidity over ice (RHi). We use airborne measurements from the combined high-spectral-resolution and differential-absorption lidar, WALES, performed during the HALO-(AC)3 campaign. We classify each research flight and the measured clouds as either AC or WAI, based on the ambient conditions, and study the macrophysical, geometrical and optical characteristics for each cirrus group. As our main parameter we choose the relative humidity over ice (RHi), which we calculate RHi by combining the lidar water vapor measurements with model temperatures. Ice formation occurs at certain RHi values depending on the dominant nucleation process taking place. RHi can thus be used as an indication of the nucleation process and the structure of cirrus clouds. We find that during WAI events the Arctic is warmer and moister and WAI cirrus clouds are both geometrically and optically thicker compared to AC cirrus. WAI cirrus clouds and the layer directly surrounding them are more frequently supersaturated, also at high supersaturations over the threshold for homogeneous ice nucleation (HOM). AC cirrus clouds have a supersaturation-dominated cloud top and a subsaturated cloud base. WAI cirrus clouds also have high supersaturations at cloud top but also at cloud base. |
format |
Article in Journal/Newspaper |
author |
Dekoutsidis, Georgios Wirth, Martin Groß, Silke |
author_facet |
Dekoutsidis, Georgios Wirth, Martin Groß, Silke |
author_sort |
Dekoutsidis, Georgios |
title |
The effects of warm-air intrusions in the high Arctic on cirrus clouds |
title_short |
The effects of warm-air intrusions in the high Arctic on cirrus clouds |
title_full |
The effects of warm-air intrusions in the high Arctic on cirrus clouds |
title_fullStr |
The effects of warm-air intrusions in the high Arctic on cirrus clouds |
title_full_unstemmed |
The effects of warm-air intrusions in the high Arctic on cirrus clouds |
title_sort |
effects of warm-air intrusions in the high arctic on cirrus clouds |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-5971-2024 https://noa.gwlb.de/receive/cop_mods_00073817 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071960/acp-24-5971-2024.pdf https://acp.copernicus.org/articles/24/5971/2024/acp-24-5971-2024.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
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-24-5971-2024 https://noa.gwlb.de/receive/cop_mods_00073817 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00071960/acp-24-5971-2024.pdf https://acp.copernicus.org/articles/24/5971/2024/acp-24-5971-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-24-5971-2024 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
24 |
container_issue |
10 |
container_start_page |
5971 |
op_container_end_page |
5987 |
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1802640407205511168 |