Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models
In this study the mechanisms for low-frequency variability of summer Arctic sea ice are analyzed using long control simulations from three coupled models (GFDL CM2.1, GFDL CM3, and NCAR CESM). Despite different Arctic sea ice mean states, there are many robust features in the response of low-frequen...
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ftosti:oai:osti.gov:1565700 2023-07-30T04:00:17+02:00 Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models Li, Dawei Zhang, Rong Knutson, Thomas 2021-08-02 application/pdf http://www.osti.gov/servlets/purl/1565700 https://www.osti.gov/biblio/1565700 https://doi.org/10.1175/jcli-d-16-0617.1 unknown http://www.osti.gov/servlets/purl/1565700 https://www.osti.gov/biblio/1565700 https://doi.org/10.1175/jcli-d-16-0617.1 doi:10.1175/jcli-d-16-0617.1 54 ENVIRONMENTAL SCIENCES 2021 ftosti https://doi.org/10.1175/jcli-d-16-0617.1 2023-07-11T09:37:06Z In this study the mechanisms for low-frequency variability of summer Arctic sea ice are analyzed using long control simulations from three coupled models (GFDL CM2.1, GFDL CM3, and NCAR CESM). Despite different Arctic sea ice mean states, there are many robust features in the response of low-frequency summer Arctic sea ice variability to the three key predictors (Atlantic and Pacific oceanic heat transport into the Arctic and the Arctic dipole) across all three models. In all three models, an enhanced Atlantic (Pacific) heat transport into the Arctic induces summer Arctic sea ice decline and surface warming, especially over the Atlantic (Pacific) sector of the Arctic. A positive phase of the Arctic dipole induces summer Arctic sea ice decline and surface warming on the Pacific side, and opposite changes on the Atlantic side. There is robust Bjerknes compensation at low frequency, so the northward atmospheric heat transport provides a negative feedback to summer Arctic sea ice variations. The influence of the Arctic dipole on summer Arctic sea ice extent is more (less) effective in simulations with less (excessive) climatological summer sea ice in the Atlantic sector. Finally, the response of Arctic sea ice thickness to the three key predictors is stronger in models that have thicker climatological Arctic sea ice. Other/Unknown Material Arctic Sea ice SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Pacific Journal of Climate 31 3 1205 1226 |
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Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
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topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Li, Dawei Zhang, Rong Knutson, Thomas Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
In this study the mechanisms for low-frequency variability of summer Arctic sea ice are analyzed using long control simulations from three coupled models (GFDL CM2.1, GFDL CM3, and NCAR CESM). Despite different Arctic sea ice mean states, there are many robust features in the response of low-frequency summer Arctic sea ice variability to the three key predictors (Atlantic and Pacific oceanic heat transport into the Arctic and the Arctic dipole) across all three models. In all three models, an enhanced Atlantic (Pacific) heat transport into the Arctic induces summer Arctic sea ice decline and surface warming, especially over the Atlantic (Pacific) sector of the Arctic. A positive phase of the Arctic dipole induces summer Arctic sea ice decline and surface warming on the Pacific side, and opposite changes on the Atlantic side. There is robust Bjerknes compensation at low frequency, so the northward atmospheric heat transport provides a negative feedback to summer Arctic sea ice variations. The influence of the Arctic dipole on summer Arctic sea ice extent is more (less) effective in simulations with less (excessive) climatological summer sea ice in the Atlantic sector. Finally, the response of Arctic sea ice thickness to the three key predictors is stronger in models that have thicker climatological Arctic sea ice. |
author |
Li, Dawei Zhang, Rong Knutson, Thomas |
author_facet |
Li, Dawei Zhang, Rong Knutson, Thomas |
author_sort |
Li, Dawei |
title |
Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
title_short |
Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
title_full |
Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
title_fullStr |
Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
title_full_unstemmed |
Comparison of Mechanisms for Low-Frequency Variability of Summer Arctic Sea Ice in Three Coupled Models |
title_sort |
comparison of mechanisms for low-frequency variability of summer arctic sea ice in three coupled models |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1565700 https://www.osti.gov/biblio/1565700 https://doi.org/10.1175/jcli-d-16-0617.1 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
http://www.osti.gov/servlets/purl/1565700 https://www.osti.gov/biblio/1565700 https://doi.org/10.1175/jcli-d-16-0617.1 doi:10.1175/jcli-d-16-0617.1 |
op_doi |
https://doi.org/10.1175/jcli-d-16-0617.1 |
container_title |
Journal of Climate |
container_volume |
31 |
container_issue |
3 |
container_start_page |
1205 |
op_container_end_page |
1226 |
_version_ |
1772810799186706432 |