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The Ocean and Atmosphere in the Maritime Continent and Their Impacts
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Impact of the South China Sea Summer Monsoon on the Indian Ocean Dipole
P-P5-09-S
Yazhou Zhang* , Beijing Normal University
Jianping Li, Beijing Normal University
Jiaqing Xue, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)
Juan Feng, Beijing Normal University
Qiuyun Wang, Beijing Normal University
Yidan Xu, Beijing Normal University
Yuehong Wang, Beijing Normal University
Fei Zheng, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG)
Presenter Email: 201531490008@mail.bnu.edu.cn |
| This paper investigates the impact of the South China Sea summer monsoon (SCSSM) on the Indian Ocean Dipole (IOD). The results show that the SCSSM has a significant relationship with the IOD over the boreal summer (June-August, JJA) and fall (September-November, SON). When the SCSSM is strong, more and less precipitation falls over the western North Pacific and Maritime Continent, respectively, and this corresponds with enhanced South China Sea monsoon Hadley circulation (SCSMHC). The precipitation dipole over the western North Pacific and Maritime Continent, as well as the enhanced SCSMHC, lead to intensification of the southeasterly anomalies off Sumatra and Java, which then contribute to the negative sea surface temperature (SST) anomalies in the tropical southeastern Indian Ocean through the positive wind-evaporation-SST and wind-thermocline-SST (Bjerknes) feedbacks. Consequently, a positive IOD develops due to the increased zonal gradient of the tropical Indian Ocean SST anomalies, and vice versa. The SCSSM has a peak correlation with the IOD when the former leads the latter by three months. This implies that a positive IOD can persist from JJA to SON and reach its mature phase within the frame of the positive Bjerknes feedback in SON. In addition, the El Nino-Southern Oscillation (ENSO) has a slight influence on the relationship between the SCSSM and the IOD. |
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