Multidecadal variation of northern hemisphere summer monsoon forced by the SST inter-hemispheric dipole

Dados Bibliográficos

ID15550426
AutoresJiaqing Xue (0000-0002-1194-6286, Nanjing University of Information Science and Technology, autor correspondente), Bingchao Wang (Nanjing University of Information Science and Technology), Yongkui Yu (Nanjing University of Information Science and Technology), Jianping Li (0000-0003-4976-4119, Ocean University of China), Cheng Sun (0000-0002-2744-0896, Beijing Normal University), Jiangyu Mao (0000-0001-6268-6165, Institute of Atmospheric Physics)
Ano2022
Volume17
Fascículo4
Páginas044033-044033
Data de publicação2022-03-21
Peer ReviewedSim
Open AccessSim
TipoARTICLE
PeriódicoEnvironmental Research Letters (JOURNAL)
Identificadores do periódicoISSN: 1748-9326 • E-ISSN: 1748-9326
EditoraIOP Publishing (PUBLISHER • GB)
DOI10.1088/1748-9326/ac5a65
OpenAlexW4225262845
IdiomaEN
Citações recebidas1
Referências citadas41

The sea surface temperature inter-hemispheric dipole (SSTID) is an important variability mode of global SST anomalies, characterized by an anti-phase variation of SST between the two hemispheres. In this study, the decadal variation of the northern hemisphere summer monsoon (NHSM) is found to be strongly regulated by the SSTID, with positive (negative) phases of the SSTID corresponding to the strengthening (weakening) of NHSM. Both observation and SST-forced atmospheric model simulations suggest that the SSTID related thermal forcing modulates the NHSM by causing planetary-scale atmospheric circulation adjustments. Positive SSTID events lead to coherent increase (decrease) of surface air temperature over the entire northern (southern) hemisphere, increasing the inter-hemispheric thermal contrast (ITC). As sea level pressure changes are just opposite to air temperature, the increase of ITC enhances the inter-hemispheric pressure gradient (southern hemisphere minus northern hemisphere), leading to the strengthening of summer monsoonal circulation and the increase of monsoon rainfall in the northern hemisphere

Atmospheric Circulation · Atmospheric sciences · Climatology · Forcing (mathematics · Monsoon · Northern Hemisphere · Sea surface temperature · Southern Hemisphere · Climate variability and models · Environmental Science · Meteorological Phenomena and Simulations · Oceanographic and Atmospheric Processes · Geology