Influence of the extratropical Pacific on the tropical Pacific through oceanic processes

ZHAO Shan-shan; YANG Xiu-qun; ZHU Yi-min; Rong Xin-yao

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ZHAO Shan-shan, YANG Xiu-qun, ZHU Yi-min, Rong Xin-yao. Influence of the extratropical Pacific on the tropical Pacific through oceanic processes[J]. Haiyang Xuebao, 2006, 28(3): 29-40.

Citation:

ZHAO Shan-shan, YANG Xiu-qun, ZHU Yi-min, Rong Xin-yao. Influence of the extratropical Pacific on the tropical Pacific through oceanic processes[J]. Haiyang Xuebao, 2006, 28(3): 29-40.

ZHAO Shan-shan, YANG Xiu-qun, ZHU Yi-min, Rong Xin-yao. Influence of the extratropical Pacific on the tropical Pacific through oceanic processes[J]. Haiyang Xuebao, 2006, 28(3): 29-40.

Citation:

ZHAO Shan-shan, YANG Xiu-qun, ZHU Yi-min, Rong Xin-yao. Influence of the extratropical Pacific on the tropical Pacific through oceanic processes[J]. Haiyang Xuebao, 2006, 28(3): 29-40.

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Influence of the extratropical Pacific on the tropical Pacific through oceanic processes

1.
Laboratory of Climate Studies, China Meteorological Administration, Beijing 100081, China;Institue of Severe Weather and Climate, Nanjing University, Nanjing 210093, China
2.
Institue of Severe Weather and Climate, Nanjing University, Nanjing 210093, China
3.
Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China

Received Date: 2005-02-11
Rev Recd Date: 2006-03-20

Abstract

Abstract

The influence of the extratropical Pacific on the tropical Pacific through the oceanic processes on the interannual and interdecadal time scales was studied with an oceanic general circulation model,the Modular Ocean Model version 2 of Geophysical Fluid Dynamics Laboratory.The model was run for 46 a (1945~1993)with the surface conditions taken from COADS,as a control run.Aparallel sensitivity experiment was run with the same surface conditions everywhere as the control run except over the extratropical Pacific where the surface condition was prescribed with clima ology.Difference between the control run and the sensitivity run indicates the influence of the extratropical Pacific on the tropical Pacific through the oceanic processes.On the interannual time scale,the process of wave propagation is important,but its influence is weak.On the interdecadal time scale,dominant process is associated with the thermal transportation of subtropical cell in which the transportation due to anomalous cell is more important than the climatological cell.The oceanic temperature anomaly is mainly located in pycnocline both on the interannual and interdecadal time scales.The surface forcing of the extratropical South Pacific has impact on water mass exchange between the extratropical and tropical Pacific,while such an impact is weak in the extratropical North Pacific.
- subduction,,
- subtropical cell,
- subtropical gyre,
- pycnocline

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