Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift
We verified that the synchronous propagations of the spatial patterns of sea ice concentration (SIC) of wavenumber 2 around the Antarctic occurred only for the period 1984 to 1994. An empirical orthogonal function (EOF) analysis of satellite data for 1979-2003 objectively demonstrates that the spati...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/39939 https://doi.org/10.1029/2009JD011807 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/39939 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/39939 2023-05-15T13:55:39+02:00 Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift Udagawa, Yusuke Tachibana, Yoshihiro Yamazaki, Koji http://hdl.handle.net/2115/39939 https://doi.org/10.1029/2009JD011807 eng eng American Geophysical Union http://hdl.handle.net/2115/39939 Journal of Geophysical Research : Atmospheres, 114: D21103 http://dx.doi.org/10.1029/2009JD011807 An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. 451 article (author version) fthokunivhus https://doi.org/10.1029/2009JD011807 2022-11-18T01:01:56Z We verified that the synchronous propagations of the spatial patterns of sea ice concentration (SIC) of wavenumber 2 around the Antarctic occurred only for the period 1984 to 1994. An empirical orthogonal function (EOF) analysis of satellite data for 1979-2003 objectively demonstrates that the spatial pattern of SIC propagated eastward only in 1984-1994, in other years, it did not. Our results show that interannual variations in SIC patterns are associated with differences in the dominant large-scale atmospheric patterns. In non-propagating years, variance of the tropospheric Antarctic oscillation (AAO) predominated. However, in propagating years, the AAO variance was subdominant to that of the Pacific South American (PSA) teleconnection pattern having a 4-year period. Such periodic PSA enables the SIC anomalies to propagate eastward with a periodically reinforced dipole pattern. The shift of large-scale atmospheric variability is one possible cause of the modulation in the SIC pattern. The switch of the atmospheric EOF leading mode from the PSA pattern to the AAO in the mid-1990s corresponded to the modulation in the SIC pattern and supports the presence of the atmospheric climate shifts. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Pacific Southern Ocean The Antarctic Journal of Geophysical Research 114 D21 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
451 |
spellingShingle |
451 Udagawa, Yusuke Tachibana, Yoshihiro Yamazaki, Koji Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
topic_facet |
451 |
description |
We verified that the synchronous propagations of the spatial patterns of sea ice concentration (SIC) of wavenumber 2 around the Antarctic occurred only for the period 1984 to 1994. An empirical orthogonal function (EOF) analysis of satellite data for 1979-2003 objectively demonstrates that the spatial pattern of SIC propagated eastward only in 1984-1994, in other years, it did not. Our results show that interannual variations in SIC patterns are associated with differences in the dominant large-scale atmospheric patterns. In non-propagating years, variance of the tropospheric Antarctic oscillation (AAO) predominated. However, in propagating years, the AAO variance was subdominant to that of the Pacific South American (PSA) teleconnection pattern having a 4-year period. Such periodic PSA enables the SIC anomalies to propagate eastward with a periodically reinforced dipole pattern. The shift of large-scale atmospheric variability is one possible cause of the modulation in the SIC pattern. The switch of the atmospheric EOF leading mode from the PSA pattern to the AAO in the mid-1990s corresponded to the modulation in the SIC pattern and supports the presence of the atmospheric climate shifts. |
format |
Article in Journal/Newspaper |
author |
Udagawa, Yusuke Tachibana, Yoshihiro Yamazaki, Koji |
author_facet |
Udagawa, Yusuke Tachibana, Yoshihiro Yamazaki, Koji |
author_sort |
Udagawa, Yusuke |
title |
Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
title_short |
Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
title_full |
Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
title_fullStr |
Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
title_full_unstemmed |
Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
title_sort |
modulation in interannual sea ice patterns in the southern ocean in association with large-scale atmospheric mode shift |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/2115/39939 https://doi.org/10.1029/2009JD011807 |
geographic |
Antarctic Pacific Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
http://hdl.handle.net/2115/39939 Journal of Geophysical Research : Atmospheres, 114: D21103 http://dx.doi.org/10.1029/2009JD011807 |
op_rights |
An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2009JD011807 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
D21 |
_version_ |
1766262439644495872 |