气候变化领域集成服务门户(CCPortal): The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations

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DOI	10.1007/s00382-020-05280-9
	The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations
	Han Z.; Zhang Q.; Wen Q.; Lu Z.; Feng G.; Su T.; Li Q.; Zhang Q.
发表日期	2020
ISSN	0930-7575
起始页码	503
结束页码	519
卷号	55
英文摘要	The El Niño-Southern Oscillation (ENSO) is one of the most significant climate variability signals. Studying the changes in ENSO-induced precipitation variability (ENSO precipitation) in the past climate offers a possibility to a better understanding of how they may change under future climate conditions. This study uses simulations performed with the European community Earth-System Model (EC-Earth) to investigate the relative contributions of dynamic effect (the circulation anomalies together with the climatological specific humidity) and thermodynamic effect (the specific humidity anomalies together with the climatological circulation) on the changes in ENSO precipitation in the past warm and cold climates, represented by the Pliocene and the Last Glacial Maximum (LGM), respectively. The results show that the changes in ENSO precipitation are intensified (weakened) over the tropical western Pacific but weakened (intensified) over the tropical central Pacific in Pliocene (LGM) compared with the pre-industrial (PI) simulation. Based on the decomposed moisture budget equation, these changes in ENSO precipitation patterns are highly related to the dynamic effect. The mechanism can be understood as follows: the zonal gradient of the mean sea surface temperature (SST) over the tropical Indo-Pacific is increased (reduced) during the Pliocene (LGM), leading to the strengthening (weakening) of Pacific Walker Circulation as well as a westward (eastward) shift. In the Pliocene, the westward shift of Walker Circulation results in an increased (decreased) ENSO-induced low-level vertical velocity variability in the tropical western Pacific (central Pacific), and, in turn, favoring convergent (divergent) moisture transport through a dynamic process, and then causing intensified (weakened) ENSO precipitation there. The opposite mechanism exists in LGM. These results suggest that changes in the zonal SST gradient over tropical Indo-Pacific under different climate conditions determine the changes in ENSO precipitation through a dynamic process. © 2020, The Author(s).
英文关键词	Dynamic and thermodynamic contribution; El Niño-Southern Oscillation; Precipitation variability; The Last Glacial Maximum; The Pliocene; Walker circulation; Zonal SST gradient
语种	英语
scopus关键词	climate conditions; climate variation; El Nino-Southern Oscillation; Last Glacial Maximum; moisture transfer; Pliocene; precipitation (climatology); sea surface temperature; temperature gradient; thermodynamics; Walker circulation; Pacific Ocean; Pacific Ocean (Tropical); Pomatiopsis californica
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145401
作者单位	Department of Physical Geography and Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; College of Atmospheric Sciences, Lanzhou University, Lanzhou, China; Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS) and Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China; Department of Meteorology (MISU), Stockholm University, Stockholm, Sweden; Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; College of Physical Science and Technology, Yangzhou University, Yangzhou, China; Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing, China
推荐引用方式 GB/T 7714	Han Z.,Zhang Q.,Wen Q.,et al. The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations[J],2020,55.
APA	Han Z..,Zhang Q..,Wen Q..,Lu Z..,Feng G..,...&Zhang Q..(2020).The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations.Climate Dynamics,55.
MLA	Han Z.,et al."The changes in ENSO-induced tropical Pacific precipitation variability in the past warm and cold climates from the EC-Earth simulations".Climate Dynamics 55(2020).