The study of upwelling seasonal and interannual variability and its interaction between air and sea in the southwest tropical Indian Ocean

CAI Yi; LING Tiejun; ZHANG Zhihua; CHEN Xingron

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CAI Yi, LING Tiejun, ZHANG Zhihua, CHEN Xingron. The study of upwelling seasonal and interannual variability and its interaction between air and sea in the southwest tropical Indian Ocean[J]. Haiyang Xuebao, 2012, 34(6): 42-49.

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The study of upwelling seasonal and interannual variability and its interaction between air and sea in the southwest tropical Indian Ocean

National Research Center for Marine Environmental Forecasting, Beijing 100081, China

Received Date: 2011-12-28

Abstract

Abstract

Based on the ocean temperature reanalysis data of Ishii etc,this paper discusses the seasonal and interannual variability of upwelling region in southwestern tropical India Ocean(SWTIO),the temperature anomalies related to the upwelling region,and the relationship between the variations and tropical India and Pacific Ocean air-sea system. The study shows that the upwelling in SWTIO is the strongest in summer and winter and weakest in spring in the southern hemisphere. The scope extends 5°-10°S from north to south and 50°-90°E from west to east. The variations of the upwelling region are closely related to the temperature anomalies on the thermocline and there is an outstanding 5 a oscillation cycle. The oscillation propagates along the path of 11.5°-6.5°S to the west on the vertical maximum temperature anomaly level(MTAL) from eastern tropical India Ocean. The propagation is different from the temperature anomalies propagation in tropical Pacific Ocean. The SWTIO upwelling is an important component of the air-sea interaction system of India-Pacific Ocean. The India Ocean DIPOLE index is 5 months ahead of the temperature changes of the SWTIO upwelling region and the maximum correlation coefficient reaches 0.57. The NINO3 SST index is 2 months ahead of the temperature changes of the SWTIO upwelling region and the correlation coefficient reaches 0.49. The changes of wind field above tropical Indian-Pacific Ocean impact the changes of SSTA on the surface of tropical Pacific and India Ocean,leading to the cycle of ENSO and DIPOLE and further triggering the changes in the upwelling region of SWTIO.
- southwest tropical Indian Ocean,
- Indian Ocean Dipole,
- Pacific Ocean ENSO,
- Indo-Pacific ocean-atmosphere system

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