Influence of Arctic sea-ice variability on Pacific trade winds.
A conceptual model connecting seasonal loss of Arctic sea ice to midlatitude extreme weather events is applied to the 21st-century intensification of Central Pacific trade winds, emergence of Central Pacific El Nino events, and weakening of the North Pacific Aleutian Low Circulation. According to th...
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ftcdlib:oai:escholarship.org/ark:/13030/qt6cx0g7js 2023-05-15T13:14:51+02:00 Influence of Arctic sea-ice variability on Pacific trade winds. Kennel, Charles F Yulaeva, Elena 2824 - 2834 2020-02-01 application/pdf https://escholarship.org/uc/item/6cx0g7js unknown eScholarship, University of California qt6cx0g7js https://escholarship.org/uc/item/6cx0g7js public Proceedings of the National Academy of Sciences of the United States of America, vol 117, iss 6 Aleutian Low Arctic sea ice Central Pacific El Nino Pacific trade winds decadal variability article 2020 ftcdlib 2021-01-01T18:59:02Z A conceptual model connecting seasonal loss of Arctic sea ice to midlatitude extreme weather events is applied to the 21st-century intensification of Central Pacific trade winds, emergence of Central Pacific El Nino events, and weakening of the North Pacific Aleutian Low Circulation. According to the model, Arctic Ocean warming following the summer sea-ice melt drives vertical convection that perturbs the upper troposphere. Static stability calculations show that upward convection occurs in annual 40- to 45-d episodes over the seasonally ice-free areas of the Beaufort-to-Kara Sea arc. The episodes generate planetary waves and higher-frequency wave trains that transport momentum and heat southward in the upper troposphere. Regression of upper tropospheric circulation data on September sea-ice area indicates that convection episodes produce wave-mediated teleconnections between the maximum ice-loss region north of the Siberian Arctic coast and the Intertropical Convergence Zone (ITCZ). These teleconnections generate oppositely directed trade-wind anomalies in the Central and Eastern Pacific during boreal winter. The interaction of upper troposphere waves with the ITCZ air-sea column may also trigger Central Pacific El Nino events. Finally, waves reflected northward from the ITCZ air column and/or generated by triggered El Nino events may be responsible for the late winter weakening of the Aleutian Low Circulation in recent years. Article in Journal/Newspaper aleutian low Arctic Arctic Ocean Kara Sea Sea ice University of California: eScholarship Arctic Arctic Ocean Kara Sea Pacific |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Aleutian Low Arctic sea ice Central Pacific El Nino Pacific trade winds decadal variability |
spellingShingle |
Aleutian Low Arctic sea ice Central Pacific El Nino Pacific trade winds decadal variability Kennel, Charles F Yulaeva, Elena Influence of Arctic sea-ice variability on Pacific trade winds. |
topic_facet |
Aleutian Low Arctic sea ice Central Pacific El Nino Pacific trade winds decadal variability |
description |
A conceptual model connecting seasonal loss of Arctic sea ice to midlatitude extreme weather events is applied to the 21st-century intensification of Central Pacific trade winds, emergence of Central Pacific El Nino events, and weakening of the North Pacific Aleutian Low Circulation. According to the model, Arctic Ocean warming following the summer sea-ice melt drives vertical convection that perturbs the upper troposphere. Static stability calculations show that upward convection occurs in annual 40- to 45-d episodes over the seasonally ice-free areas of the Beaufort-to-Kara Sea arc. The episodes generate planetary waves and higher-frequency wave trains that transport momentum and heat southward in the upper troposphere. Regression of upper tropospheric circulation data on September sea-ice area indicates that convection episodes produce wave-mediated teleconnections between the maximum ice-loss region north of the Siberian Arctic coast and the Intertropical Convergence Zone (ITCZ). These teleconnections generate oppositely directed trade-wind anomalies in the Central and Eastern Pacific during boreal winter. The interaction of upper troposphere waves with the ITCZ air-sea column may also trigger Central Pacific El Nino events. Finally, waves reflected northward from the ITCZ air column and/or generated by triggered El Nino events may be responsible for the late winter weakening of the Aleutian Low Circulation in recent years. |
format |
Article in Journal/Newspaper |
author |
Kennel, Charles F Yulaeva, Elena |
author_facet |
Kennel, Charles F Yulaeva, Elena |
author_sort |
Kennel, Charles F |
title |
Influence of Arctic sea-ice variability on Pacific trade winds. |
title_short |
Influence of Arctic sea-ice variability on Pacific trade winds. |
title_full |
Influence of Arctic sea-ice variability on Pacific trade winds. |
title_fullStr |
Influence of Arctic sea-ice variability on Pacific trade winds. |
title_full_unstemmed |
Influence of Arctic sea-ice variability on Pacific trade winds. |
title_sort |
influence of arctic sea-ice variability on pacific trade winds. |
publisher |
eScholarship, University of California |
publishDate |
2020 |
url |
https://escholarship.org/uc/item/6cx0g7js |
op_coverage |
2824 - 2834 |
geographic |
Arctic Arctic Ocean Kara Sea Pacific |
geographic_facet |
Arctic Arctic Ocean Kara Sea Pacific |
genre |
aleutian low Arctic Arctic Ocean Kara Sea Sea ice |
genre_facet |
aleutian low Arctic Arctic Ocean Kara Sea Sea ice |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, vol 117, iss 6 |
op_relation |
qt6cx0g7js https://escholarship.org/uc/item/6cx0g7js |
op_rights |
public |
_version_ |
1766265795222962176 |