The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades
Arctic sea ice decrease in extent in recent decades has been linked to sea surface temperature (SST) anomalies in the North Pacific Ocean. In this study, we assess the relative contributions of the two leading modes in North Pacific SST anomalies representing external forcing related to global warmi...
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ftcopernicus:oai:publications.copernicus.org:tcd74803 2023-05-15T14:39:36+02:00 The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades Yu, Lejiang Zhong, Shiyuan Vihma, Timo 2019-04-30 application/pdf https://doi.org/10.5194/tc-2019-38 https://tc.copernicus.org/preprints/tc-2019-38/ eng eng doi:10.5194/tc-2019-38 https://tc.copernicus.org/preprints/tc-2019-38/ eISSN: 1994-0424 Text 2019 ftcopernicus https://doi.org/10.5194/tc-2019-38 2020-07-20T16:22:51Z Arctic sea ice decrease in extent in recent decades has been linked to sea surface temperature (SST) anomalies in the North Pacific Ocean. In this study, we assess the relative contributions of the two leading modes in North Pacific SST anomalies representing external forcing related to global warming and internal forcing related to Pacific Decadal Oscillation (PDO) to the Arctic sea ice loss in boreal summer and autumn. For the 1979–2017 period, the time series of the global warming and PDO modes show significant positive and negative trends, respectively. The global warming mode accounts for 44.9 % and 50.1 % of the Arctic sea ice loss in boreal summer and autumn during this period, compared to the 20.0 % and 22.2 % from the PDO mode. There is also a seasonal difference in the response of atmospheric circulations to the two modes. The PDO mode excites a wavetrain from North Pacific to the Arctic; the wavetrain is not seen in the response of atmospheric circulation to the global warming mode. Both dynamic and thermodynamic forcings work in the relationship of atmospheric circulation and sea ice anomalies. Text Arctic Global warming Sea ice Copernicus Publications: E-Journals Arctic Pacific |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Arctic sea ice decrease in extent in recent decades has been linked to sea surface temperature (SST) anomalies in the North Pacific Ocean. In this study, we assess the relative contributions of the two leading modes in North Pacific SST anomalies representing external forcing related to global warming and internal forcing related to Pacific Decadal Oscillation (PDO) to the Arctic sea ice loss in boreal summer and autumn. For the 1979–2017 period, the time series of the global warming and PDO modes show significant positive and negative trends, respectively. The global warming mode accounts for 44.9 % and 50.1 % of the Arctic sea ice loss in boreal summer and autumn during this period, compared to the 20.0 % and 22.2 % from the PDO mode. There is also a seasonal difference in the response of atmospheric circulations to the two modes. The PDO mode excites a wavetrain from North Pacific to the Arctic; the wavetrain is not seen in the response of atmospheric circulation to the global warming mode. Both dynamic and thermodynamic forcings work in the relationship of atmospheric circulation and sea ice anomalies. |
format |
Text |
author |
Yu, Lejiang Zhong, Shiyuan Vihma, Timo |
spellingShingle |
Yu, Lejiang Zhong, Shiyuan Vihma, Timo The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
author_facet |
Yu, Lejiang Zhong, Shiyuan Vihma, Timo |
author_sort |
Yu, Lejiang |
title |
The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
title_short |
The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
title_full |
The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
title_fullStr |
The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
title_full_unstemmed |
The contributions of the leading modes of the North Pacific sea surface temperature variability to the Arctic sea ice depletion in recent decades |
title_sort |
contributions of the leading modes of the north pacific sea surface temperature variability to the arctic sea ice depletion in recent decades |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-2019-38 https://tc.copernicus.org/preprints/tc-2019-38/ |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Arctic Global warming Sea ice |
genre_facet |
Arctic Global warming Sea ice |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2019-38 https://tc.copernicus.org/preprints/tc-2019-38/ |
op_doi |
https://doi.org/10.5194/tc-2019-38 |
_version_ |
1766311571153223680 |