Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets

In this study, warm and moist air intrusions (WaMAIs) over the Arctic Ocean sectors of Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea in 40 recent winters (from 1979 to 2018) are identified from the ERA5 reanalysis using both Eulerian and Lagrangian views. The an...

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Published in:Atmospheric Chemistry and Physics
Main Authors: You, Cheng, Tjernström, Michael, Devasthale, Abhay
Format: Text
Language:English
Published: 2022
Subjects:
Online Access:https://doi.org/10.5194/acp-22-8037-2022
https://acp.copernicus.org/articles/22/8037/2022/
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spelling ftcopernicus:oai:publications.copernicus.org:acp96404 2023-05-15T14:53:10+02:00 Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets You, Cheng Tjernström, Michael Devasthale, Abhay 2022-06-21 application/pdf https://doi.org/10.5194/acp-22-8037-2022 https://acp.copernicus.org/articles/22/8037/2022/ eng eng doi:10.5194/acp-22-8037-2022 https://acp.copernicus.org/articles/22/8037/2022/ eISSN: 1680-7324 Text 2022 ftcopernicus https://doi.org/10.5194/acp-22-8037-2022 2022-06-27T16:22:42Z In this study, warm and moist air intrusions (WaMAIs) over the Arctic Ocean sectors of Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea in 40 recent winters (from 1979 to 2018) are identified from the ERA5 reanalysis using both Eulerian and Lagrangian views. The analysis shows that WaMAIs, fueled by Arctic blocking, cause a relative surface warming and hence a sea-ice reduction by exerting positive anomalies of net thermal irradiances and turbulent fluxes on the surface. Over Arctic Ocean sectors with land-locked sea ice in winter, such as Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea, the total surface energy-budget is dominated by net thermal irradiance. From a Lagrangian perspective, total water path (TWP) increases linearly with the downstream distance from the sea-ice edge over the completely ice-covered sectors, inducing almost linearly increasing net thermal irradiance and total surface energy-budget. However, over the Barents Sea, with an open ocean to the south, total net surface energy-budget is dominated by the surface turbulent flux. With the energy in the warm-and-moist air continuously transported to the surface, net surface turbulent flux gradually decreases with distance, especially within the first 2 ∘ north of the ice edge, inducing a decreasing but still positive total surface energy-budget. The boundary-layer energy-budget patterns over the Barents Sea can be categorized into three classes: radiation-dominated, turbulence-dominated, and turbulence-dominated with cold dome, comprising about 52 %, 40 %, and 8 % of all WaMAIs, respectively. Statistically, turbulence-dominated cases with or without cold dome occur along with 1 order of magnitude larger large-scale subsidence than the radiation-dominated cases. For the turbulence-dominated category, larger turbulent fluxes are exerted to the surface, probably because of stronger wind shear. In radiation-dominated WaMAIs, stratocumulus develops more strongly and triggers intensive cloud-top ... Text Arctic Arctic Ocean Barents Sea Beaufort Sea Chukchi Chukchi Sea East Siberian Sea Kara Sea laptev Laptev Sea Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Barents Sea Chukchi Sea East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) Kara Sea Laptev Sea Atmospheric Chemistry and Physics 22 12 8037 8057
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description In this study, warm and moist air intrusions (WaMAIs) over the Arctic Ocean sectors of Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea in 40 recent winters (from 1979 to 2018) are identified from the ERA5 reanalysis using both Eulerian and Lagrangian views. The analysis shows that WaMAIs, fueled by Arctic blocking, cause a relative surface warming and hence a sea-ice reduction by exerting positive anomalies of net thermal irradiances and turbulent fluxes on the surface. Over Arctic Ocean sectors with land-locked sea ice in winter, such as Laptev Sea, East Siberian Sea, Chukchi Sea, and Beaufort Sea, the total surface energy-budget is dominated by net thermal irradiance. From a Lagrangian perspective, total water path (TWP) increases linearly with the downstream distance from the sea-ice edge over the completely ice-covered sectors, inducing almost linearly increasing net thermal irradiance and total surface energy-budget. However, over the Barents Sea, with an open ocean to the south, total net surface energy-budget is dominated by the surface turbulent flux. With the energy in the warm-and-moist air continuously transported to the surface, net surface turbulent flux gradually decreases with distance, especially within the first 2 ∘ north of the ice edge, inducing a decreasing but still positive total surface energy-budget. The boundary-layer energy-budget patterns over the Barents Sea can be categorized into three classes: radiation-dominated, turbulence-dominated, and turbulence-dominated with cold dome, comprising about 52 %, 40 %, and 8 % of all WaMAIs, respectively. Statistically, turbulence-dominated cases with or without cold dome occur along with 1 order of magnitude larger large-scale subsidence than the radiation-dominated cases. For the turbulence-dominated category, larger turbulent fluxes are exerted to the surface, probably because of stronger wind shear. In radiation-dominated WaMAIs, stratocumulus develops more strongly and triggers intensive cloud-top ...
format Text
author You, Cheng
Tjernström, Michael
Devasthale, Abhay
spellingShingle You, Cheng
Tjernström, Michael
Devasthale, Abhay
Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
author_facet You, Cheng
Tjernström, Michael
Devasthale, Abhay
author_sort You, Cheng
title Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
title_short Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
title_full Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
title_fullStr Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
title_full_unstemmed Warm and moist air intrusions into the winter Arctic: a Lagrangian view on the near-surface energy budgets
title_sort warm and moist air intrusions into the winter arctic: a lagrangian view on the near-surface energy budgets
publishDate 2022
url https://doi.org/10.5194/acp-22-8037-2022
https://acp.copernicus.org/articles/22/8037/2022/
long_lat ENVELOPE(166.000,166.000,74.000,74.000)
geographic Arctic
Arctic Ocean
Barents Sea
Chukchi Sea
East Siberian Sea
Kara Sea
Laptev Sea
geographic_facet Arctic
Arctic Ocean
Barents Sea
Chukchi Sea
East Siberian Sea
Kara Sea
Laptev Sea
genre Arctic
Arctic Ocean
Barents Sea
Beaufort Sea
Chukchi
Chukchi Sea
East Siberian Sea
Kara Sea
laptev
Laptev Sea
Sea ice
genre_facet Arctic
Arctic Ocean
Barents Sea
Beaufort Sea
Chukchi
Chukchi Sea
East Siberian Sea
Kara Sea
laptev
Laptev Sea
Sea ice
op_source eISSN: 1680-7324
op_relation doi:10.5194/acp-22-8037-2022
https://acp.copernicus.org/articles/22/8037/2022/
op_doi https://doi.org/10.5194/acp-22-8037-2022
container_title Atmospheric Chemistry and Physics
container_volume 22
container_issue 12
container_start_page 8037
op_container_end_page 8057
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