| DOI: | 10.1002/2015GL065463
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| 论文题名: | Evidence for weakening of the Walker circulation from cloud observations |
| 作者: | Bellomo K.; Clement A.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9490
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| EISSN: | 1944-9221
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| 出版年: | 2015
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| 卷: | 42, 期:18 | | 起始页码: | 7758
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| 结束页码: | 7766
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| 语种: | 英语
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| 英文关键词: | cloud cover
; Walker circulation
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| Scopus关键词: | Atmospheric temperature
; Greenhouse gases
; Oceanography
; Sea level
; Surface waters
; Atmospheric circulation
; Atmospheric model intercomparison projects
; Cloud cover
; Direct measurement
; Indirect measurements
; Overturning circulation
; Sea surface temperature (SST)
; Walker circulation
; Climate models
; air-sea interaction
; atmospheric circulation
; atmospheric modeling
; climate modeling
; cloud cover
; estimation method
; greenhouse gas
; observational method
; sea level pressure
; sea surface temperature
; troposphere
; velocity
; Walker circulation
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| 英文摘要: | Climate models simulate a weakening of the Walker circulation in response to increased greenhouse gases, but it has not been possible to detect this weakening with observations because there are not direct measurements of atmospheric circulation strength. Indirect measurements, such as equatorial gradients in sea level pressure (SLP), exhibit trends of inconsistent sign. In this study we estimate the change in midtropospheric velocity (ω500) from observed change in cloud cover, which we argue is more closely tied to the overturning circulation than indirect measurements of SLP at the surface. Our estimates suggest a weakening and eastward shift of the Walker circulation over the last century. Because changes in cloud cover in Atmospheric Model Intercomparison Project simulations forced with increased sea surface temperature are remarkably similar in pattern, sign, and magnitude, we assert that the observed changes in cloud cover and the associated weakening of Walker circulation are at least in part externally forced. © 2015 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945208046&doi=10.1002%2f2015GL065463&partnerID=40&md5=b48c54674bcf10f418bca0deec26f65f
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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/9105
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
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| Recommended Citation: | |
Bellomo K.,Clement A.C.. Evidence for weakening of the Walker circulation from cloud observations[J]. Geophysical Research Letters,2015-01-01,42(18).
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