Role of the Seasonal Cycle in the Subduction Rates of Upper-Southern Ocean Waters

doi:10.1175/JPO-D-12-060.1

	Role of the Seasonal Cycle in the Subduction Rates of Upper-Southern Ocean Waters
	Kwon, Eun Young 1; Downes, Stephanie M.2,3; Sarmiento, Jorge L.4; Farneti, Riccardo 5; Deutsch, Curtis 1
刊名	JOURNAL OF PHYSICAL OCEANOGRAPHY
	2013-06
卷号	43 期号:6 页码:1096-1113
ISSN号	0022-3670
DOI	10.1175/JPO-D-12-060.1
英文摘要	A kinematic approach is used to diagnose the subduction rates of upper-Southern Ocean waters across seasonally migrating density outcrops at the base of the mixed layer. From an Eulerian viewpoint, the term representing the temporal change in the mixed layer depth (which is labeled as the temporal induction in this study; i.e., S-temp = partial derivative h/partial derivative t where h is the mixed layer thickness, and t is time) vanishes over several annual cycles. Following seasonally migrating density outcrops, however, the temporal induction is attributed partly to the temporal change in the mixed layer thickness averaged over a density outcrop following its seasonally varying position and partly to the lateral movement of the outcrop position intersecting the sloping mixed layer base. Neither the temporal induction following an outcrop nor its integral over the outcrop area vanishes over several annual cycles. Instead, the seasonal eddy subduction, which arises primarily because of the subannual correlations between the seasonal cycles of the mixed layer depth and the outcrop area, explains the key mechanism by which mode waters are transferred from the mixed layer to the underlying pycnocline. The time-mean exchange rate of waters across the base of the mixed layer is substantially different from the exchange rate of waters across the fixed winter mixed layer base in mode water density classes. Nearly 40% of the newly formed Southern Ocean mode waters appear to be diapycnally transformed within the seasonal pycnocline before either being subducted into the main pycnocline or entrained back to the mixed layer through lighter density classes.
资助项目	NSF Award[ANT-1040957]
WOS关键词	MESOSCALE EDDIES ; LAYER ; CIRCULATION ; MODEL
WOS研究方向	Oceanography
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000320162300002
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25540]
专题	自然资源部第一海洋研究所
通讯作者	Kwon, Eun Young
作者单位	1.Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USA 2.Australian Natl Univ, Res Sch Earth Sci, Acton, Australia 3.Australian Natl Univ, ARC Ctr Excellence Climate Syst Sci, Acton, ACT, Australia 4.Princeton Univ, Atmospher & Ocean Sci Program, Princeton, NJ 08544 USA 5.Abdus Salaam Int Ctr Theoret Phys, Earth Syst Phys Sect, Trieste, Italy
推荐引用方式 GB/T 7714	Kwon, Eun Young,Downes, Stephanie M.,Sarmiento, Jorge L.,et al. Role of the Seasonal Cycle in the Subduction Rates of Upper-Southern Ocean Waters[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2013,43(6):1096-1113.
APA	Kwon, Eun Young,Downes, Stephanie M.,Sarmiento, Jorge L.,Farneti, Riccardo,&Deutsch, Curtis.(2013).Role of the Seasonal Cycle in the Subduction Rates of Upper-Southern Ocean Waters.JOURNAL OF PHYSICAL OCEANOGRAPHY,43(6),1096-1113.
MLA	Kwon, Eun Young,et al."Role of the Seasonal Cycle in the Subduction Rates of Upper-Southern Ocean Waters".JOURNAL OF PHYSICAL OCEANOGRAPHY 43.6(2013):1096-1113.