气候变化领域集成服务门户(CCPortal): Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events

CCPortal

DOI	10.1007/s00382-018-4510-y
	Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events
	Wang Y.; Li J.; Zhang Y.; Wang Q.; Qin J.
发表日期	2019
ISSN	0930-7575
起始页码	6243
结束页码	6256
卷号	52 期号:2020-09-10
英文摘要	The evolution of atmospheric perturbation potential energy (PPE) over the tropical Indian Ocean is analyzed during a composite positive IOD event using reanalysis datasets for the period 1948–2015. The IOD modulates the variation in PPE, which then affects perturbation kinetic energy (PKE) through energy conversion. The PPE anomalies in the lower troposphere (1000–850 hPa) as the dominant layer of the PPE in the whole troposphere (1000–150 hPa) present a dipole pattern corresponding to the anomalous variation in SST during the IOD event. When cold SST anomalies (SSTAs) first appear in the eastern Indian Ocean (IOD-E), they reduce the atmospheric PPE in the lower troposphere rapidly. The negative PPE anomalies lead to less energy conversion to PKE, restraining the surface wind convergence over the IOD-E and weakening the climatological Walker circulation. Meanwhile, the surface easterly wind anomalies strengthen, which depresses the thermocline to the west and gives warmer SSTAs in the western Indian Ocean (IOD-W). The PPE anomalies and energy conversion (CK) over the IOD-W are opposite to those over the IOD-E, the anomalous easterly wind continues to develop, and the positive SSTAs in the IOD-W reach a peak. Thus, the response of the Walker circulation over the Indian Ocean provides a positive feedback during the IOD event and explains the delayed effect of IOD-E SSTAs on IOD-W SSTAs. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	climatology; Indian Ocean Dipole; kinetic energy; potential energy; sea surface temperature; surface wind; temperature anomaly; thermocline; troposphere; Walker circulation; Indian Ocean; Indian Ocean (Tropical)
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/146309
作者单位	College of Global Change and Earth System Sciences (GCESS), Beijing Normal University, Beijing, 100875, China; Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China; Institute of Oceanography, Shanghai Jiao Tong University, Shanghai, 200433, China
推荐引用方式 GB/T 7714	Wang Y.,Li J.,Zhang Y.,et al. Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events[J],2019,52(2020-09-10).
APA	Wang Y.,Li J.,Zhang Y.,Wang Q.,&Qin J..(2019).Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events.Climate Dynamics,52(2020-09-10).
MLA	Wang Y.,et al."Atmospheric energetics over the tropical Indian Ocean during Indian Ocean dipole events".Climate Dynamics 52.2020-09-10(2019).