| DOI: | 10.1175/JCLI-D-15-0301.1
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| Scopus记录号: | 2-s2.0-84957799861
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| 论文题名: | Antarctic sea ice response to weather and climate modes of variability |
| 作者: | Kohyama T.; Hartmann D.L.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2016
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| 卷: | 29, 期:2 | | 起始页码: | 721
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| 结束页码: | 741
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| 语种: | 英语
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| Scopus关键词: | Atmospheric pressure
; Atmospheric structure
; Climatology
; Mechanical waves
; Meteorology
; Sea ice
; Spectrum analysis
; Time measurement
; Annular mode
; Antarctic oscillation
; ENSO
; Planetary Waves
; Rossby wave
; Stationary waves
; Ice
; Antarctic Oscillation
; atmospheric circulation
; atmospheric dynamics
; climate variation
; El Nino-Southern Oscillation
; planetary wave
; Rossby wave
; sea ice
; standing wave
; Antarctica
; Indian Ocean
; Ross Sea
; Southern Ocean
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| 英文摘要: | The relationship between climate modes and Antarctic sea ice is explored by separating the variability into intraseasonal, interannual, and decadal time scales. Cross-spectral analysis shows that geopotential height and Antarctic sea ice extent are most coherent at periods between about 20 and 40 days (the intraseasonal time scale). In this period range, where the atmospheric circulation and the sea ice extent are most tightly coupled, sea ice variability responds strongly to Rossby waves with the structure of the Pacific-South American (PSA) pattern. The PSA pattern in this time scale is not directly related to El Niño-Southern Oscillation (ENSO) or the southern annular mode (SAM), which have received much attention for explaining Antarctic sea ice variability. On the interannual time scale, ENSO and SAM are important, but a large fraction of sea ice variance can also be explained by Rossby wave-like structures in the Drake Passage region. After regressing out the sea ice extent variability associated with ENSO, the observed positive sea ice trends in Ross Sea and Indian Ocean during the satellite era become statistically insignificant. Regressing outSAMmakes the sea ice trend in the Indian Ocean insignificant. Thus, the positive trends in sea ice in the Ross Sea and the Indian Ocean sectors may be explained by the variability and decadal trends of known interannual climate modes. © 2016 American Meteorological Society. |
| 资助项目: | NSF, National Science Foundation
; NSF, National Science Foundation
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/50220
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
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| Recommended Citation: | |
Kohyama T.,Hartmann D.L.. Antarctic sea ice response to weather and climate modes of variability[J]. Journal of Climate,2016-01-01,29(2)
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