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- Title
Interannual variations in low potential vorticity water and the subtropical countercurrent in an eddy-resolving OGCM.
- Authors
Nonaka, Masami; Xie, Shang-Ping; Sasaki, Hideharu
- Abstract
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-σ isopycnal surfaces, and intensified meridional density gradient in subsurface layers, consistent with Kubokawa's theory (J Phys Oceanogr 29:1314-1333, ). The low-PV signals appear at least 2 years before peaks of STCC, propagating southwestward from the subduction region.
- Subjects
NORTH Pacific Ocean; VORTEX motion; TIDE-waters; OCEANOGRAPHIC research; STATISTICAL correlation; SUBDUCTION zones
- Publication
Journal of Oceanography, 2012, Vol 68, Issue 1, p139
- ISSN
0916-8370
- Publication type
Article
- DOI
10.1007/s10872-011-0042-3