气候变化领域集成服务门户(CCPortal): The modulation of gulf stream influence on the troposphere by the eddy-driven jet

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DOI	10.1175/JCLI-D-19-0294.1
	The modulation of gulf stream influence on the troposphere by the eddy-driven jet
	Parfitt R.; Kwon Y.-O.
发表日期	2020
ISSN	0894-8755
起始页码	4109
结束页码	4120
卷号	33 期号:10
英文摘要	This study suggests that the Gulf Stream influence on the wintertime North Atlantic troposphere is most pronounced when the eddy-driven jet (EDJ) is farthest south and better collocated with the Gulf Stream. Using the reanalysis dataset NCEP-CFSR for December-February 1979-2009, the daily EDJ latitude is separated into three regimes (northern, central, and southern). It is found that the average trajectory of atmospheric fronts covaries with EDJ latitude. In the southern EDJ regime (;19% of the time), the frequency of near-surface atmospheric fronts that pass across the Gulf Stream is maximized. Analysis suggests that this leads to significant strengthening in near-surface atmospheric frontal convergence resulting from strong air-sea sensible heat flux gradients (due to strong temperature gradients in the atmosphere and ocean). In recent studies, it was shown that the pronounced band of time-mean near-surface wind convergence across the Gulf Stream is set by atmospheric fronts. Here, it is shown that an even smaller subset of atmospheric fronts-those associated with a southern EDJ-primarily sets the time mean, due to enhanced Gulf Stream air-sea interaction. Furthermore, statistically significant anomalies in vertical velocity extending well above the boundary layer are identified in association with changes in EDJ latitude. These anomalies are particularly strong for a southern EDJ and are spatially consistent with increases in near-surface atmospheric frontal convergence over the Gulf Stream. These results imply that much of the Gulf Stream influence on the time-mean atmosphere is modulated on synoptic time scales, and enhanced when the EDJ is farthest south. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Boundary layers; Heat flux; Troposphere; Air sea interactions; Atmospheric fronts; Gulf Stream; Near surfaces; Near-surface winds; North Atlantic; Sensible heat flux; Vertical velocity; Ocean currents; air-sea interaction; atmospheric front; boundary layer; convergence; eddy; jet flow; marine atmosphere; sensible heat flux; temperature gradient; troposphere; Atlantic Ocean; Atlantic Ocean (North); Gulf Stream
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171324
作者单位	Florida State University, Tallahassee, FL, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States
推荐引用方式 GB/T 7714	Parfitt R.,Kwon Y.-O.. The modulation of gulf stream influence on the troposphere by the eddy-driven jet[J],2020,33(10).
APA	Parfitt R.,&Kwon Y.-O..(2020).The modulation of gulf stream influence on the troposphere by the eddy-driven jet.Journal of Climate,33(10).
MLA	Parfitt R.,et al."The modulation of gulf stream influence on the troposphere by the eddy-driven jet".Journal of Climate 33.10(2020).