| DOI: | 10.1007/s00382-016-3329-7
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| Scopus记录号: | 2-s2.0-84983470140
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| 论文题名: | Relationship between eastern tropical Pacific cooling and recent trends in the Southern Hemisphere zonal-mean circulation |
| 作者: | Clem K.R.; Renwick J.A.; McGregor J.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2017
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| 卷: | 49, 期:2017-01-02 | | 起始页码: | 113
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| 结束页码: | 129
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| 语种: | 英语
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| 英文关键词: | El Nino-Southern oscillation
; Hadley cell
; Mid-latitude jet
; Southern annular mode
; Tropical teleconnections
; Walker circulation
; Zonal circulation
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| 英文摘要: | During 1979–2014, eastern tropical Pacific sea surface temperatures significantly cooled, which has generally been attributed to the transition of the Pacific Decadal Oscillation to its negative phase after 1999. We find the eastern tropical Pacific cooling to be associated with: (1) an intensified Walker Circulation during austral summer (December–February, DJF) and autumn (March–May, MAM); (2) a weakened South Pacific Hadley cell and subtropical jet during MAM; and (3) a strengthening of the circumpolar westerlies between 50 and 60°S during DJF and MAM. Observed cooling in the eastern tropical Pacific is linearly congruent with 60–80 % of the observed Southern Hemisphere positive zonal-mean zonal wind trend between 50 and 60°S during DJF (~35 % of the interannual variability), and around half of the observed positive zonal-mean zonal wind trend during MAM (~15 % of the interannual variability). Although previous studies have linked the strengthened DJF and MAM circumpolar westerlies to stratospheric ozone depletion and increasing greenhouse gases, we note that the continuation of the positive SAM trends into the twenty-first century is partially associated with eastern tropical Pacific cooling, especially during MAM when zonal wind anomalies associated with eastern tropical Pacific cooling project strongly onto the observed trends. Outside of DJF and MAM, eastern tropical Pacific cooling is associated with opposing zonal wind anomalies over the Pacific and Indian sectors, which we infer is the reason for the absence of significant positive SAM trends outside of DJF and MAM despite significant eastern tropical Pacific cooling seen during all seasons. © 2016, Springer-Verlag Berlin Heidelberg. |
| 资助项目: | Royal Society of New Zealand
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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/53185
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Cotton Building, Room 311, Wellington, New Zealand
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| Recommended Citation: | |
Clem K.R.,Renwick J.A.,McGregor J.. Relationship between eastern tropical Pacific cooling and recent trends in the Southern Hemisphere zonal-mean circulation[J]. Climate Dynamics,2017-01-01,49(2017-01-02)
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