Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea
ABSTRACT Cold air outbreaks ( CAOs ) are the dominant cause of intense wintertime upward heat fluxes in the Irminger Sea. In this study, the climatological pathways of Irminger Sea CAO airmasses and the evolution of airmass properties, as well as the large‐scale synoptic environments leading to CAO...
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crwiley:10.1002/joc.4991 2024-09-15T18:03:38+00:00 Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea Papritz, Lukas Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 2017 http://dx.doi.org/10.1002/joc.4991 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4991 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4991 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 37, issue S1, page 193-207 ISSN 0899-8418 1097-0088 journal-article 2017 crwiley https://doi.org/10.1002/joc.4991 2024-07-18T04:27:08Z ABSTRACT Cold air outbreaks ( CAOs ) are the dominant cause of intense wintertime upward heat fluxes in the Irminger Sea. In this study, the climatological pathways of Irminger Sea CAO airmasses and the evolution of airmass properties, as well as the large‐scale synoptic environments leading to CAO formation are examined for winter. To that end, a comprehensive, multi‐decadal climatology of Irminger Sea CAO airmasses using kinematic trajectories is presented, complemented by a composite analysis of the large‐scale synoptic environment for intense CAO events. The following three synoptic environments conducive for CAO formation are identified: (1) The westerly environment is characterized by an upper‐level trough crossing Greenland and inducing strong westerly winds at crest level, accompanied by either cyclogenesis or the intensification of an existing cyclone in the lee of Greenland. The associated CAO airmasses originate in the Canadian Arctic, overflow southern Greenland, and descend into the Irminger Sea with an according imprint in their thermodynamic evolution. (2) In the easterly cyclonic environment, one or multiple cyclones in the Nordic Seas induce northerly winds along Greenland's eastern coast that transport Arctic airmasses from Fram Strait to Denmark Strait. (3) The easterly anti‐cyclonic environment, finally, is dominated by an anti‐cyclone over Greenland with similar airmass origins and pathways as in the easterly cyclonic environment. The two easterly environments represent the limiting cases of an intermediate spectrum, whereas in contrast the westerly environment is clearly distinct. Katabatic drainage from northern Greenland contributes to the CAO airmasses in both easterly environments, whereas in the easterly cyclonic environment also marine airmasses from the Nordic Seas are involved. An important conclusion of this study is that the amount of heat extracted from the ocean by a CAO airmass depends critically on its pathway, and thus on the synoptic environment. Article in Journal/Newspaper Denmark Strait Fram Strait Greenland Nordic Seas Wiley Online Library International Journal of Climatology 37 S1 193 207 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Cold air outbreaks ( CAOs ) are the dominant cause of intense wintertime upward heat fluxes in the Irminger Sea. In this study, the climatological pathways of Irminger Sea CAO airmasses and the evolution of airmass properties, as well as the large‐scale synoptic environments leading to CAO formation are examined for winter. To that end, a comprehensive, multi‐decadal climatology of Irminger Sea CAO airmasses using kinematic trajectories is presented, complemented by a composite analysis of the large‐scale synoptic environment for intense CAO events. The following three synoptic environments conducive for CAO formation are identified: (1) The westerly environment is characterized by an upper‐level trough crossing Greenland and inducing strong westerly winds at crest level, accompanied by either cyclogenesis or the intensification of an existing cyclone in the lee of Greenland. The associated CAO airmasses originate in the Canadian Arctic, overflow southern Greenland, and descend into the Irminger Sea with an according imprint in their thermodynamic evolution. (2) In the easterly cyclonic environment, one or multiple cyclones in the Nordic Seas induce northerly winds along Greenland's eastern coast that transport Arctic airmasses from Fram Strait to Denmark Strait. (3) The easterly anti‐cyclonic environment, finally, is dominated by an anti‐cyclone over Greenland with similar airmass origins and pathways as in the easterly cyclonic environment. The two easterly environments represent the limiting cases of an intermediate spectrum, whereas in contrast the westerly environment is clearly distinct. Katabatic drainage from northern Greenland contributes to the CAO airmasses in both easterly environments, whereas in the easterly cyclonic environment also marine airmasses from the Nordic Seas are involved. An important conclusion of this study is that the amount of heat extracted from the ocean by a CAO airmass depends critically on its pathway, and thus on the synoptic environment. |
author2 |
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung |
format |
Article in Journal/Newspaper |
author |
Papritz, Lukas |
spellingShingle |
Papritz, Lukas Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
author_facet |
Papritz, Lukas |
author_sort |
Papritz, Lukas |
title |
Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
title_short |
Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
title_full |
Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
title_fullStr |
Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
title_full_unstemmed |
Synoptic environments and characteristics of cold air outbreaks in the Irminger Sea |
title_sort |
synoptic environments and characteristics of cold air outbreaks in the irminger sea |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/joc.4991 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.4991 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.4991 |
genre |
Denmark Strait Fram Strait Greenland Nordic Seas |
genre_facet |
Denmark Strait Fram Strait Greenland Nordic Seas |
op_source |
International Journal of Climatology volume 37, issue S1, page 193-207 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.4991 |
container_title |
International Journal of Climatology |
container_volume |
37 |
container_issue |
S1 |
container_start_page |
193 |
op_container_end_page |
207 |
_version_ |
1810441110393192448 |