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Controls on the Northward Movement of the ITCZ over the South China Sea in Autumn:A Heavy Rain Case Study

Advances in Atmospheric Sciences 2021年第10期38卷 1651-1664页

作者： Fei WANG Lifang SHENG Xiadong AN Qian LIU Haixia ZHOU Yingying ZHANG Jianping LI Department of Marine Meteorology College of Oceanic and Atmospheric SciencesOcean University of ChinaQingdao 266100China Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province Haikou 570000China Ocean-Atmosphere Interaction and Climate Laboratory Key Laboratory of Physical OceanographyOcean University of ChinaQingdao 266100China Department of Marine Meteorology School of Atmospheric SciencesSun Yat-Sen UniversityZhuhai 519000China Sansha Meteorological Bureau of Hainan Province Sansha 573199China Professional Meteorological Science and Technology Service Center of Hainan province Haikou 570000China Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES)/Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies Ocean University of ChinaQingdao 266100China Laboratory for Ocean Dynamics and Climate Pilot Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

The autumn Intertropical Convergence Zone(ITCZ)over the South China Sea(SCS)is typically held south of 10°N by prevailing northeasterly and weakening southwesterly ***,the ITCZ can move north,resulting in heavy rainfall in the northern SCS(NSCS).We investigate the mechanisms that drove the northward movement of the ITCZ and led to heavy non-tropical-cyclone rainfall over the NSCS in autumn of *** results show that the rapid northward movement of the ITCZ on 1 and 2 October was caused by the joint influence of the equatorial easterlies(EE),southwesterly winds,and the easterly jet(EJ)in the NSCS.A high pressure center on the east side of Australia,strengthened by the quasi-biweekly oscillation and strong Walker circulation,was responsible for the EE to intensify and reach the *** EE finally turned southeast and together with enhanced southwesterly winds associated with an anticyclone,pushed the ITCZ ***,the continental high moved east,which reduced the area of the EJ in the NSCS and made room for the *** regression analysis showed that the reduced area of the EJ and increased strength of the EE contributed significantly to the northward movement of the *** enhancement of the EE preceded the northward movement of the ITCZ by six hours and pushed the ITCZ continually *** the ITCZ approached 12°N,it not only transported warm moist air but also strengthened the dynamic field by transporting the positive vorticity horizontally and vertically which further contributed to the heavy rainfall.

关键词： ITCZ rainfall northern South China Sea equatorial easterly easterly jet

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