DOI: 10.1007/s00382-017-3978-1
Scopus记录号: 2-s2.0-85032375069
论文题名: Importance of positive cloud feedback for tropical Atlantic interhemispheric climate variability
作者: Myers T.A. ; Mechoso C.R. ; DeFlorio M.J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-05-06 起始页码: 1707
结束页码: 1717
语种: 英语
Scopus关键词: annual variation
; boundary layer
; climate variation
; cloud cover
; sea level pressure
; sea surface temperature
; surface wind
; temperature anomaly
; Atlantic Ocean
; Atlantic Ocean (Tropical)
英文摘要: Over the tropical Atlantic during boreal spring, average interhemispheric differences in sea-surface temperature (SST) coincide with a coherent pattern of interannual climate variability often referred to as the Atlantic Meridional Mode. This includes anomalous SST and sea-level pressure roughly anti-symmetric about the equator, as well as cross-equatorial near-surface winds directed toward the warmer hemisphere. Within subtropical marine boundary layer cloud regions in both hemispheres, enhanced cloudiness associated with this variability is co-located with cool SST, a strong temperature inversion, and cold horizontal surface temperature advection, while reduced cloudiness is associated with the opposite meteorological conditions. This is indicative a positive cloud feedback that reinforces the underlying SST anomalies. The simulation of this feedback varies widely among models participating in phase 5 of the Coupled Model Intercomparison Project. Models that fail to simulate this feedback substantially underestimate the amplitudes of typical tropical Atlantic interhemispheric variability in cloudiness off of the equator, SST, and atmospheric circulation. Models that correctly reproduce a positive cloud feedback generally produce higher and more realistic amplitudes of variability, but with substantial scatter. Marine boundary layer clouds therefore appear to be a key element of springtime coupled atmosphere–ocean variability over the tropical Atlantic. A markedly more successful simulation of this variability in climate models may be obtained by better representing boundary layer cloud processes. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109121
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, 520 Portola Plaza, 7127 Math Sciences Building, Los Angeles, CA 90095, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Myers T.A.,Mechoso C.R.,DeFlorio M.J.. Importance of positive cloud feedback for tropical Atlantic interhemispheric climate variability[J]. Climate Dynamics,2018-01-01,51(2018-05-06)