DOI: 10.1175/JCLI-D-14-00312.1
Scopus记录号: 2-s2.0-84919624669
论文题名: Long-lived response of the midlatitude circulation and storm tracks to pulses of tropical heating
作者: Branstator G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 23 起始页码: 8809
结束页码: 8826
语种: 英语
Scopus关键词: Experiments
; Rain
; Tropics
; Troposphere
; Atmospheric general circulation models
; Building blockes
; Geographical locations
; Phase propagation
; Subseasonal variability
; Surface field
; Tropical precipitation
; Tropical rainfall
; Heating
; atmospheric circulation
; atmospheric general circulation model
; heating
; midlatitude environment
; storm track
; synoptic meteorology
; tropical region
英文摘要: The midlatitude response to localized equatorial heating events that last 2 days is examined through experimentation with an atmospheric general circulation model. Such responses are argued to be important because many tropical rainfall events only last a short time and because the responses to such pulses serve as building blocks with which to study the impacts of more general heating fluctuations. The experiments indicate that short-lived heating produces responses in midlatitudes at locations far removed from the source and these responses persist much longer than the pulses themselves. Indeed pulse forcing, which is essentially white in time, produces upper-tropospheric responses that have an e-damping time of almost a week and that are detectable for more than two weeks in the experiments. Moreover the upper-tropospheric structure of the reaction to short pulses is remarkably similar to the reaction to steady tropical heating, including having a preference for occurring at special geographical locations and being composed of recurring patterns that resemble the leading patterns of responses to steady heating. This similarity is argued to be a consequence of the responses to pulses having little or no phase propagation in the extratropics. The impact of short-lived tropical heating also produces a persistent response in midlatitude surface fields and in the statistics of synoptic eddies. The implications these results have for subseasonal variability are discussed. These include 1) the potential for improving subseasonal prediction through improved assimilation and short-range forecasts of tropical precipitation and 2) the difficulties involved in attributing subseasonal midlatitude events to tropical heating. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51152
Appears in Collections: 气候变化事实与影响
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作者单位: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO, United States
Recommended Citation:
Branstator G.. Long-lived response of the midlatitude circulation and storm tracks to pulses of tropical heating[J]. Journal of Climate,2014-01-01,27(23)