| DOI: | 10.1175/JCLI-D-11-00104.1
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| Scopus记录号: | 2-s2.0-84857000944
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| 论文题名: | Extratropical forcing of tropical atlantic variability during boreal summer and fall |
| 作者: | Smirnov D.; Vimont D.J.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2012
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| 卷: | 25, 期:6 | | 起始页码: | 2056
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| 结束页码: | 2076
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| 语种: | 英语
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| Scopus关键词: | Atlantic basin
; Atlantic sea
; Atmosphere-ocean interactions
; Boreal Spring
; Coupled general circulation models
; Extratropical
; General circulation model
; Inverse modeling
; Lead time
; Midlatitudes
; Nonlinear interactions
; North Atlantic oscillations
; Observational study
; Seasonal dependence
; Slab ocean
; SST anomalies
; Teleconnections
; Tropical atlantic
; Atmospheric pressure
; Climate change
; Climate models
; Feedback
; Inverse problems
; Optimization
; Tropics
; air-sea interaction
; atmospheric forcing
; climate feedback
; climate modeling
; general circulation model
; North Atlantic Oscillation
; numerical model
; sea surface temperature
; summer
; teleconnection
; temperature anomaly
; Atlantic Ocean
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| 英文摘要: | The connection between midlatitude Atlantic sea surface temperature (SST) anomalies and tropical SST variations during boreal summer and fall are investigated using a coupled general circulation model (GCM). This research follows on an observational study that finds that, using linear inverse modeling (LIM), predictions of boreal summer tropical Atlantic Meridional Mode (AMM) variations can be made with skill exceeding persistence with lead times of about one year. The LIM framework identified extratropical Atlantic SST anomalies as important precursors to the AMM variations. The authors have corroborated this finding using a general circulation model coupled to a slab ocean, which represents a completely different physical basis from the LIM. Initializing the GCM with the LIM-derived "optimal" SST anomaly in November results in a steady equatorward propagation of SST anomalies into the subtropics during the following boreal spring. Thereafter, the GCM suggests that two possible feedbacks propagate the SST anomalies farther equatorward and westward with minimal loss of amplitude: the dominant wind-evaporation-SST (WES) thermodynamic feedback and a secondary low-cloud-SST radiative feedback. This study shows that this result has strong seasonal dependence and consists of nonlinear interactions when considering warm and cold "optimal" conditions separately. One main finding is that oceanic dynamics are not essential to understanding extratropical-tropical interaction in the Atlantic basin. The authors also discuss the results of the study in context with previous studies investigating the extratropical forcing of tropical air-sea variability. © 2012 American Meteorological Society. |
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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/52528
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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 and Oceanic Sciences, Center for Climatic Research, University of Wisconsin-Madison, Madison, WI, United States
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| Recommended Citation: | |
Smirnov D.,Vimont D.J.. Extratropical forcing of tropical atlantic variability during boreal summer and fall[J]. Journal of Climate,2012-01-01,25(6)
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