Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes
The potential mechanisms underlying the observed increasing trend in Antarctic summertime sea ice cover for the 1979-2017 period have been investigated using a relatively novel method called the self-organizing map (SOM). Among the nine nodes generated to explain the variability of Antarctic sea ice...
Published in: | Journal of Climate |
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Language: | English |
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2018
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Online Access: | https://doi.org/10.1175/JCLI-D-17-0739.1 |
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ftncar:oai:drupal-site.org:articles_21607 2023-09-05T13:12:33+02:00 Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes Yu, Lejiang (author) Zhong, Shiyuan (author) Zhou, Mingyu (author) Sun, Bo (author) Lenschow, Donald H. (author) 2018-05-01 https://doi.org/10.1175/JCLI-D-17-0739.1 en eng Journal of Climate--J. Climate--0894-8755--1520-0442 Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1--10.5067/8GQ8LZQVL0VL articles:21607 ark:/85065/d77h1n9r doi:10.1175/JCLI-D-17-0739.1 Copyright 2018 American Meteorological Society (AMS). article Text 2018 ftncar https://doi.org/10.1175/JCLI-D-17-0739.1 2023-08-14T18:48:56Z The potential mechanisms underlying the observed increasing trend in Antarctic summertime sea ice cover for the 1979-2017 period have been investigated using a relatively novel method called the self-organizing map (SOM). Among the nine nodes generated to explain the variability of Antarctic sea ice cover, two (nodes 3 and 7) exhibit a statistically significant linear trend in the time series of the frequency of the SOM pattern occurrence that together explain 40% of the total trend in the sea ice cover. These two nodes have completely opposite spatial patterns and directions of trend and are associated with different atmospheric circulation patterns. Node 3, which represents an increase in sea ice over the Weddell Sea and the eastern Ross Sea and a decrease over the other coastal seas of West Antarctica, appears to be related to the positive phase of the southern annular mode (SAM) linked with the La Nina pattern of sea surface temperature (SST) over the tropical Pacific Ocean. The opposite spatial pattern and trend represented by node 7 is associated with a wave train originating over northern Australia. The anomalous wind field, surface downward longwave radiation, and surface air temperature generated by these circulation patterns are consistent with the spatial pattern and overall trends in the Antarctic sea ice cover. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ross Sea Sea ice Weddell Sea West Antarctica OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Pacific Ross Sea The Antarctic Weddell Weddell Sea West Antarctica Journal of Climate 31 10 3909 3920 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
language |
English |
description |
The potential mechanisms underlying the observed increasing trend in Antarctic summertime sea ice cover for the 1979-2017 period have been investigated using a relatively novel method called the self-organizing map (SOM). Among the nine nodes generated to explain the variability of Antarctic sea ice cover, two (nodes 3 and 7) exhibit a statistically significant linear trend in the time series of the frequency of the SOM pattern occurrence that together explain 40% of the total trend in the sea ice cover. These two nodes have completely opposite spatial patterns and directions of trend and are associated with different atmospheric circulation patterns. Node 3, which represents an increase in sea ice over the Weddell Sea and the eastern Ross Sea and a decrease over the other coastal seas of West Antarctica, appears to be related to the positive phase of the southern annular mode (SAM) linked with the La Nina pattern of sea surface temperature (SST) over the tropical Pacific Ocean. The opposite spatial pattern and trend represented by node 7 is associated with a wave train originating over northern Australia. The anomalous wind field, surface downward longwave radiation, and surface air temperature generated by these circulation patterns are consistent with the spatial pattern and overall trends in the Antarctic sea ice cover. |
author2 |
Yu, Lejiang (author) Zhong, Shiyuan (author) Zhou, Mingyu (author) Sun, Bo (author) Lenschow, Donald H. (author) |
format |
Article in Journal/Newspaper |
title |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
spellingShingle |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
title_short |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
title_full |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
title_fullStr |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
title_full_unstemmed |
Antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
title_sort |
antarctic summer sea ice trend in the context of high-latitude atmospheric circulation changes |
publishDate |
2018 |
url |
https://doi.org/10.1175/JCLI-D-17-0739.1 |
geographic |
Antarctic Pacific Ross Sea The Antarctic Weddell Weddell Sea West Antarctica |
geographic_facet |
Antarctic Pacific Ross Sea The Antarctic Weddell Weddell Sea West Antarctica |
genre |
Antarc* Antarctic Antarctica Ross Sea Sea ice Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ross Sea Sea ice Weddell Sea West Antarctica |
op_relation |
Journal of Climate--J. Climate--0894-8755--1520-0442 Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 1--10.5067/8GQ8LZQVL0VL articles:21607 ark:/85065/d77h1n9r doi:10.1175/JCLI-D-17-0739.1 |
op_rights |
Copyright 2018 American Meteorological Society (AMS). |
op_doi |
https://doi.org/10.1175/JCLI-D-17-0739.1 |
container_title |
Journal of Climate |
container_volume |
31 |
container_issue |
10 |
container_start_page |
3909 |
op_container_end_page |
3920 |
_version_ |
1776200747072880640 |