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Response of the Diurnal Cycle of Summer Rainfall to Large-Scale Circulation and Coastal Upwelling at Hainan, South China
Shi, Rui; Cai, Qinbo1,2; Dong, Lingyu3; Guo, Xinyu4; Wang, Dongxiao5
2019
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
Volume124Issue:7Pages:3702
AbstractThe modulation of coastal rainfall at Hainan by large-scale circulation and coastal upwelling is studied using observations and numerical modeling. Tropical Rainfall Measuring Mission data show that the monthly mean rainfall off southern Hainan was considerably higher in August 2010 than in August 2011. The main cause of this difference is an intensification of offshore rainfall from midnight to early morning. Compared with the multiyear (2000-2017) average field, reanalysis data show that there is an apparent increase in atmospheric humidity in August 2010. During this time, a moderate El Nino was decaying and a new La Nina event was developing, so a significant adjustment of the large-scale circulation was observed in the western Pacific. The resulting anomalous onshore wind depresses the development of upwelling, leading to a relatively warm sea surface temperature off the south coast of Hainan, which in turn enhances the land-sea thermal contrast and land breeze at night. Decreases in upwelling intensity and asymmetric intensification of nocturnal and daytime offshore rainfall are confirmed not only in the summer of 2010 but also in the summer of 2003. Numerical simulations using the Weather Research and Forecasting model verify that the enhanced land breeze ultimately leads to pronounced coastal rainfall off southern Hainan at night. The results indicate that localized surface convergence associated with the sea and land breezes may be more important than the atmospheric humidity and convective instability in modulating the diurnal cycle of rainfall for tropical islands.
DepartmentLTO
DOI10.1029/2018JD029528
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17740
Collection热带海洋环境国家重点实验室(LTO)
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
2.Key Lab South China Sea Meteorol Disaster Prevent, Haikou, Hainan, Peoples R China
3.Hainan Meteorol Serv, Haikou, Hainan, Peoples R China
4.Hainan Meteorol Observ, Haikou, Hainan, Peoples R China
5.Ehime Univ, Ctr Marine Environm Studies, Matsuyama, Ehime, Japan
6.Univ Chinese Acad Sci, Guangzhou Branch, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Shi, Rui,Cai, Qinbo,Dong, Lingyu,et al. Response of the Diurnal Cycle of Summer Rainfall to Large-Scale Circulation and Coastal Upwelling at Hainan, South China[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(7):3702, 3725.
APA Shi, Rui,Cai, Qinbo,Dong, Lingyu,Guo, Xinyu,&Wang, Dongxiao.(2019).Response of the Diurnal Cycle of Summer Rainfall to Large-Scale Circulation and Coastal Upwelling at Hainan, South China.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(7),3702.
MLA Shi, Rui,et al."Response of the Diurnal Cycle of Summer Rainfall to Large-Scale Circulation and Coastal Upwelling at Hainan, South China".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.7(2019):3702.
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