North Pacific Climate Variability and Arctic Sea Ice
Boreal winter North Pacific climate variability strongly influences North American hydroclimate and Arctic sea ice distribution in the marginal Arctic seas. Two modes of atmospheric variability explaining 53% of the variance in the Pacific Ocean sea level pressure (SLP) field are extracted and ident...
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ftunivmaryland:oai:drum.lib.umd.edu:1903/8476 2023-05-15T14:44:27+02:00 North Pacific Climate Variability and Arctic Sea Ice Linkin, Megan Elizabeth Nigam, Sumant Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Atmospheric and Oceanic Sciences 2008-05-27 10676027 bytes application/pdf http://hdl.handle.net/1903/8476 en_US eng http://hdl.handle.net/1903/8476 Atmospheric Sciences North Pacific Oscillation teleconnection Arctic sea ice climate variability weekly analysis hydroclimate Dissertation 2008 ftunivmaryland 2022-11-11T11:13:36Z Boreal winter North Pacific climate variability strongly influences North American hydroclimate and Arctic sea ice distribution in the marginal Arctic seas. Two modes of atmospheric variability explaining 53% of the variance in the Pacific Ocean sea level pressure (SLP) field are extracted and identified: the Pacific-North American (PNA) teleconnection and the North Pacific Oscillation/West Pacific (NPO/WP) teleconnection. The NPO/WP, a dipole in North Pacific SLP and geopotential heights, is affiliated with latitudinal displacements of the Asian Pacific jet and an intensification of the Pacific stormtrack. The North American hydroclimate impacts of the NPO/WP are substantial; its impact on Alaska, Pacific Northwest and Great Plains precipitation is more influential than both the PNA and the El Niño-Southern Oscillation (ENSO). The NPO/WP is also strongly associated with a contemporaneous extension of the marginal ice zone (MIZ) in the western Bering Sea and Sea of Okhotsk and MIZ retreat in the eastern Bering Sea. Wintertime climate variability also significantly impacts the distribution of Arctic sea ice during the subsequent summer months, due to the hysteretic nature of the ice cap. The North Atlantic Oscillation (NAO) is known for its effects on summer sea ice distribution; this study extends into the Pacific and finds that circulation anomalies related to Pacific sea surface temperature (SST) variability also strongly impact summer Arctic sea ice. The NAO and ENSO are related to sea ice decline in the Eastern Siberian Sea, where the linear trend since 1979 is 25% per decade. PDV affects sea ice in the eastern Arctic, a region which displays no linear trend since 1979. The low frequency of PDV variability and the persistent positive NAO during the 1980s and 1990s results in natural variability being aliased into the total linear trend in summer sea ice calculated from satellite-based sea ice concentration. Since 1979, natural variability accounts for 30% of the negative trend in the Pacific marginal sea and ... Doctoral or Postdoctoral Thesis Arctic Bering Sea Ice cap North Atlantic North Atlantic oscillation Sea ice Alaska University of Maryland: Digital Repository (DRUM) Arctic Bering Sea Okhotsk Pacific |
institution |
Open Polar |
collection |
University of Maryland: Digital Repository (DRUM) |
op_collection_id |
ftunivmaryland |
language |
English |
topic |
Atmospheric Sciences North Pacific Oscillation teleconnection Arctic sea ice climate variability weekly analysis hydroclimate |
spellingShingle |
Atmospheric Sciences North Pacific Oscillation teleconnection Arctic sea ice climate variability weekly analysis hydroclimate Linkin, Megan Elizabeth North Pacific Climate Variability and Arctic Sea Ice |
topic_facet |
Atmospheric Sciences North Pacific Oscillation teleconnection Arctic sea ice climate variability weekly analysis hydroclimate |
description |
Boreal winter North Pacific climate variability strongly influences North American hydroclimate and Arctic sea ice distribution in the marginal Arctic seas. Two modes of atmospheric variability explaining 53% of the variance in the Pacific Ocean sea level pressure (SLP) field are extracted and identified: the Pacific-North American (PNA) teleconnection and the North Pacific Oscillation/West Pacific (NPO/WP) teleconnection. The NPO/WP, a dipole in North Pacific SLP and geopotential heights, is affiliated with latitudinal displacements of the Asian Pacific jet and an intensification of the Pacific stormtrack. The North American hydroclimate impacts of the NPO/WP are substantial; its impact on Alaska, Pacific Northwest and Great Plains precipitation is more influential than both the PNA and the El Niño-Southern Oscillation (ENSO). The NPO/WP is also strongly associated with a contemporaneous extension of the marginal ice zone (MIZ) in the western Bering Sea and Sea of Okhotsk and MIZ retreat in the eastern Bering Sea. Wintertime climate variability also significantly impacts the distribution of Arctic sea ice during the subsequent summer months, due to the hysteretic nature of the ice cap. The North Atlantic Oscillation (NAO) is known for its effects on summer sea ice distribution; this study extends into the Pacific and finds that circulation anomalies related to Pacific sea surface temperature (SST) variability also strongly impact summer Arctic sea ice. The NAO and ENSO are related to sea ice decline in the Eastern Siberian Sea, where the linear trend since 1979 is 25% per decade. PDV affects sea ice in the eastern Arctic, a region which displays no linear trend since 1979. The low frequency of PDV variability and the persistent positive NAO during the 1980s and 1990s results in natural variability being aliased into the total linear trend in summer sea ice calculated from satellite-based sea ice concentration. Since 1979, natural variability accounts for 30% of the negative trend in the Pacific marginal sea and ... |
author2 |
Nigam, Sumant Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Atmospheric and Oceanic Sciences |
format |
Doctoral or Postdoctoral Thesis |
author |
Linkin, Megan Elizabeth |
author_facet |
Linkin, Megan Elizabeth |
author_sort |
Linkin, Megan Elizabeth |
title |
North Pacific Climate Variability and Arctic Sea Ice |
title_short |
North Pacific Climate Variability and Arctic Sea Ice |
title_full |
North Pacific Climate Variability and Arctic Sea Ice |
title_fullStr |
North Pacific Climate Variability and Arctic Sea Ice |
title_full_unstemmed |
North Pacific Climate Variability and Arctic Sea Ice |
title_sort |
north pacific climate variability and arctic sea ice |
publishDate |
2008 |
url |
http://hdl.handle.net/1903/8476 |
geographic |
Arctic Bering Sea Okhotsk Pacific |
geographic_facet |
Arctic Bering Sea Okhotsk Pacific |
genre |
Arctic Bering Sea Ice cap North Atlantic North Atlantic oscillation Sea ice Alaska |
genre_facet |
Arctic Bering Sea Ice cap North Atlantic North Atlantic oscillation Sea ice Alaska |
op_relation |
http://hdl.handle.net/1903/8476 |
_version_ |
1766315945459974144 |