Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”

ZHAO Shan-shan; YANG Xiu-qun

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ZHAO Shan-shan, YANG Xiu-qun. Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”[J]. Haiyang Xuebao, 2004, 26(4): 33-48.

Citation:

ZHAO Shan-shan, YANG Xiu-qun. Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”[J]. Haiyang Xuebao, 2004, 26(4): 33-48.

ZHAO Shan-shan, YANG Xiu-qun. Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”[J]. Haiyang Xuebao, 2004, 26(4): 33-48.

Citation:

ZHAO Shan-shan, YANG Xiu-qun. Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”[J]. Haiyang Xuebao, 2004, 26(4): 33-48.

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Numerical experiments on interaction between the tropical Pacific and the Indian Ocean through the wind-stress “bridge”

Institute of Severe Weather and Climate, Nanjing University, Nanjing 210093, China

Received Date: 2003-07-28
Rev Recd Date: 2004-03-28

Abstract

Abstract

Intermediate tropical atmospheric and oceanic models were used to study the interaction between the tropical Pacific and the Indian Ocean through the wind-stress "bridge".In the control run,the observed SST for 1958~1998 was used to force the atmospheric model generating the surface wind-stress,which was then used to force the oceanic model with the surface heat flux taken from NCEP reanalysis to reproduce the SST.Two parallel sensitivity runs are the same as the control run except for the SST used to force the atmospheric model which was prescribed with climatology in the tropical Pacific and in the tropical Indian Ocean,respectively.The difference between the control and sensitivity runs indicates effect of the SST anomaly(SSTA) in a specific oceanic basin on the other basin through the wind-stress bridge.Such numerical experiments suggest the following results.A positive(negative) SST A in a basin generally produces a westerly(easterly) anomaly in the west and an easterly(westerly) anomaly in the east of the basin.A positive SST A in the tropical Pacific induces an easterly anomaly in the tropical Indian Ocean,which results in a weak positive interannual SST A and a weak negative interdecadal SST A in the tropical Indian Ocean;and vice versa.A positive SST A in the tropical Indian Ocean induces an easterly anomaly in the tropical Pacific Ocean,which results in a negative SST A on both the inter annual and interdecadal times cales in the tropical Pacific,and viceversa.Considering the observational fact that the SSTA in the tropical Indian Ocean is more influenced by the tropical Pacific and that the SSTA with the same polarity in the former basin always follows the latter basin,the results suggest a negative feedback role of the tropical Indian Ocean in the tropical Pacific SSTA,which is more obvious on the interdecadal times cale.
- interaction between tropical oceanic basins,
- intermediate atmospheric and oceanic models,
- wind-stress,
- sea surface temperature anomaly

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References(36)

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