气候变化领域集成服务门户(CCPortal): Processes shaping the frontal-scale time-mean surface wind convergence patterns around the gulf stream and agulhas return current in winter

CCPortal

DOI	10.1175/JCLI-D-19-0948.1
	Processes shaping the frontal-scale time-mean surface wind convergence patterns around the gulf stream and agulhas return current in winter
	Masunaga R.; Nakamura H.; Taguchi B.; Miyasaka T.
发表日期	2020
ISSN	0894-8755
起始页码	9083
结束页码	9101
卷号	33 期号:21
英文摘要	High-resolution satellite observations and numerical experiments have revealed local enhancement of time-mean surface wind convergence along the axes of warm western boundary currents and divergence slightly poleward. A recent study has suggested that frequent occurrence of persistent atmospheric fronts and sea level pressure (SLP) troughs along a sea surface temperature (SST) front are responsible for shaping the frontal-scale wind convergence and divergence contrast as seen in the wintertime climatology near the Kuroshio Extension (KE). These events tend to induce surface wind convergence with moderate magnitude. Through atmospheric reanalysis with high-resolution SST, the present study reveals that, as in the vicinity of the KE, surface wind convergence with moderate magnitude and divergence with moderate-to-extreme magnitude are found to play a primary role in shaping the climatological-mean wind convergence-divergence contrasts across the SST fronts near the Gulf Stream (GS) and Agulhas Return Current (ARC) in winter. In contrast, strong-to-extreme convergence events associated with synoptic-scale atmospheric disturbances are found to yield horizontally uniform time-mean wind convergence. Furthermore, cluster analysis and case studies suggest that persistent atmospheric fronts and SLP troughs are responsible for inducing moderate wind convergence also near the GS and ARC. Thus, these features are consistent with their counterpart near the KE, but the impacts of the ARC tend to be substantially weaker, probably due to its cooler SST among other potential factors. © 2020 American Meteorological Society.
英文关键词	Cluster analysis; Sea level; Surface waters; Atmospheric disturbance; Atmospheric reanalysis; High resolution satellites; Numerical experiments; Sea surface temperature (SST); Surface wind convergence; Western boundary currents; Wintertime climatology; Ocean currents; air-sea interaction; boundary current; boundary layer; convergence; frontogenesis; marine atmosphere; numerical model; satellite data; sea level pressure; sea surface temperature; wind field; winter; Agulhas Current; Atlantic Ocean; Gulf Stream; Indian Ocean
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/171070
作者单位	International Pacific Research Center, University of Hawai'i at Manoa, Honolulu, HI, United States; Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan; Japan Agency for Marine Earth Science and Technology, Yokohama, Japan; Faculty of Sustainable Design, University of Toyama, Toyama, Japan; Japan Meteorological Business Support Center, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan; Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Masunaga R.,Nakamura H.,Taguchi B.,et al. Processes shaping the frontal-scale time-mean surface wind convergence patterns around the gulf stream and agulhas return current in winter[J],2020,33(21).
APA	Masunaga R.,Nakamura H.,Taguchi B.,&Miyasaka T..(2020).Processes shaping the frontal-scale time-mean surface wind convergence patterns around the gulf stream and agulhas return current in winter.Journal of Climate,33(21).
MLA	Masunaga R.,et al."Processes shaping the frontal-scale time-mean surface wind convergence patterns around the gulf stream and agulhas return current in winter".Journal of Climate 33.21(2020).