Cite this paper:
LIN Wenqiang, ZHAI Fangguo, GU Yanzhen, LI Peiliang. Decadal variations of the North Pacific Tropical Water at 137°E[J]. HaiyangYuHuZhao, 2019, 37(5): 1495-1509

Decadal variations of the North Pacific Tropical Water at 137°E

LIN Wenqiang1, ZHAI Fangguo1, GU Yanzhen1, LI Peiliang2
1 Physical Oceanography Laboratory, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266003, China;
2 Institute of Physical Oceanography and Remote Sensing, Ocean College, Zhejiang University, Zhoushan 316021, China
Abstract:
The decadal variations of the North Pacific Tropical Water (NPTW) at 137°E in the western North Pacific Ocean are investigated based on the repeated hydrographic observations along with two global gridded ocean products. The results indicate that the maximum salinity of NPTW experiences significant quasi-decadal variations, having maxima around 1979, 1987, 1995, 2004, and 2012, while minima around 1974, 1983, 1991, 1999, and 2008 during the period of interest. The NPTW area also shows similar quasidecadal variation, expanding/shrinking as its maximum salinity increases/decreases at the 137°E section. These variations are induced mainly by changes in the mixed layer salinity in the source region and largescale circulation in the northwestern tropical Pacific Ocean, both of which are related to the Pacific Decadal Oscillation. The underlying processes at work are further confirmed through conducting the subsurface salinity budget analysis. Besides, short-term processes are also at work through nonlinear interactions, especially after 2000.
Key words:    North Pacific Tropical Water (NPTW)|decadal variation|subsurface salinity budget|Pacific Decadal Oscillation   
Received: 2018-04-29   Revised: 2018-06-22
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Articles by LIN Wenqiang
Articles by ZHAI Fangguo
Articles by GU Yanzhen
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