Interannual variations in low potential vorticity water and the subtropical countercurrent in an eddy-resolving OGCM

被引：15

作者：

Nonaka, Masami ^{[1
]}

Xie, Shang-Ping ^{[2
,3
]}

Sasaki, Hideharu ^{[4
]}

机构：

[1] Japan Agcy Marine Earth Sci & Technol JAMSTEC, Res Inst Global Change, Kanazawa Ku, Yokohama, Kanagawa 2360001, Japan

[2] Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA

[3] Univ Hawaii Manoa, Dept Meteorol, Sch Ocean & Earth Sci & Technol, Honolulu, HI 96822 USA

[4] JAMSTEC, Earth Simulator Ctr, Yokohama, Kanagawa, Japan

来源：

JOURNAL OF OCEANOGRAPHY | 2012年 / 68卷 / 01期

关键词：

Subtropical countercurrent; Low potential vorticity water; North Pacific; Interannual variability; Eddy-resolving ocean general circulation model; NORTH PACIFIC; DECADAL VARIABILITY; MIXED-LAYER; MODE WATER; OCEAN; FRONTS; TEMPERATURE; CIRCULATION; EXTENSION; OYASHIO;

D O I：

10.1007/s10872-011-0042-3

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

Interannual-to-decadal variations in the subtropical countercurrent (STCC) and low potential vorticity (PV) water and their relations in the North Pacific Ocean are investigated on the basis of a 60-year-long hindcast integration of an eddy-resolving ocean general circulation model. Although vertically coherent variations are dominant for STCC interannual variability, a correlation analysis shows that an intensified STCC vertical shear accompanies lower PV than usual to the north on 25.5- to 26.1-sigma(theta) isopycnal surfaces, and intensified meridional density gradient in subsurface layers, consistent with Kubokawa's theory (J Phys Oceanogr 29:1314-1333, 1999). The low-PV signals appear at least 2 years before peaks of STCC, propagating southwestward from the subduction region.

引用

页码：139 / 150

页数：12

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