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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Environmental Science / Faculty of Environmental Earth Science >
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Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift
| Title: | Modulation in interannual sea ice patterns in the Southern Ocean in association with large-scale atmospheric mode shift |
| Authors: | Udagawa, Yusuke Browse this author | | Tachibana, Yoshihiro Browse this author | | Yamazaki, Koji Browse this author →KAKEN DB |
| Issue Date: | 6-Nov-2009 |
| Publisher: | American Geophysical Union |
| Journal Title: | Journal of Geophysical Research : Atmospheres |
| Volume: | 114 |
| Start Page: | D21103 |
| Publisher DOI: | 10.1029/2009JD011807 |
| Abstract: | 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. |
| Rights: | An edited version of this paper was published by AGU. Copyright 2009 American Geophysical Union. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/39939 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 山崎 孝治
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