西北太平洋大气异常反气旋对海平面高度和海洋表层环流的影响

doi:10.11978/2016136

Abstract

Abstract:

In this study, we investigate the Northwest Pacific anomalous anticyclone (NWPAC) associated with Indian Ocean warming and its impacts on ocean circulation and sea surface height in the northwest pacific by using the reanalysis wind, current and sea surface height data of National Centers for Environmental Prediction (NCEP) and SODA v2.2.4 during the period of 1971 to 2010. Composite results reveal that the NWPAC associated with Indian Ocean warming is the strongest during the boreal summer and it has significant impacts on the upper-ocean circulation and sea surface height in the NW Pacific. The anticyclonic wind anomaly produces a negative wind stress curl, inducing convergence of sea surface water and the resultant positive sea level anomalies. The effect of NWPAC on the upper-ocean circulation in the South China Sea is synchronous, while its impact on the upper ocean east of the Philippines delays by about one season and peaks in the boreal autumn. This may be attributed to the modulation of westward oceanic Rossby wave.

Key words: Indian Ocean warming, Northwest Pacific anomalous anticyclone, ocean circulation, sea surface height, composite analysis

CLC Number:

P732.6

Yanping SHI, Yan DU, Zesheng CHEN. Impacts of Northwest Pacific anomalous anticyclone on sea surface height and circulation[J].Journal of Tropical Oceanography, 2017, 36(4): 10-17.

Figures/Tables 7

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Impacts of Northwest Pacific anomalous anticyclone on sea surface height and circulation

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