| DOI: | 10.1007/s00382-012-1645-0
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| Scopus记录号: | 2-s2.0-84878112547
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| 论文题名: | Changes in the cloud properties in response to El Niño: A bivariate approach |
| 作者: | Lacagnina C.; Selten F.
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| 刊名: | Climate Dynamics
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| ISSN: | 9307575
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| 出版年: | 2013
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| 卷: | 40, 期:2017-11-12 | | 起始页码: | 2973
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| 结束页码: | 2991
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| 语种: | 英语
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| 英文关键词: | Cloud controlling factors
; Cloud feedbacks in ENSO phases
; Cloud radiative effect
; ENSO
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| 英文摘要: | We analyse the dependence of the cloud radiative effect (CRE) and cloud amount on mid-tropospheric pressure velocity (ω 500) and sea surface temperature (SST) and point out the shortcomings of using these two proxies separately as means to separate cloud regimes. A bivariate approach is proposed to overcome these shortcomings and it is used to systematically investigate marine cloud properties at different spatial and time scales in the present-day (1985-2001) tropical climate. During the 1997-1998 El Niño, the greatest regional change in CRE and cloud cover coincides with the greatest local change in circulation and SST. In addition, we find that the cooling effect of the stratiform low clouds reduces at the rate of approximately 1 W/m2 per percent of cloudiness reduction in the subsident cold pools of the Pacific ocean. During El Niño, the transition between different cloud regimes gives rise to opposing cloud feedbacks. The sign of the total feedback is controlled by the cloud optical thickness. More generally, we find that the largest part of the cloud response to El Niño, when averaged over the tropical Pacific, is not directly associated with ω 500 and SST changes, so other factors must play a role as well. © 2013 Springer-Verlag Berlin Heidelberg. |
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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/54910
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| Appears in Collections: | 过去全球变化的重建
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作者单位: | KNMI, Royal Netherlands Meteorological Institute, De Bilt, Netherlands
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| Recommended Citation: | |
Lacagnina C.,Selten F.. Changes in the cloud properties in response to El Niño: A bivariate approach[J]. Climate Dynamics,2013-01-01,40(2017-11-12)
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