气候变化领域集成服务门户(CCPortal): What Role Does the Barrier Layer Play During Extreme El Niño Events?

CCPortal

DOI	10.1029/2020JC017001
	What Role Does the Barrier Layer Play During Extreme El Niño Events?
	Zhang X.; Sprintall J.; Zeng L.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Intensive air-sea interaction and the formation of the salinity barrier layer (BL) in the Pacific has fundamental importance to the El Niño evolution. The structure and formation of the BL in the equatorial Pacific Ocean during moderate and extreme El Niños over the past 30 years are investigated using in situ temperature and salinity data measured by the TAO/TRITON array and the data-assimilating ECCO2 product. In the western and central Pacific Ocean, the BL is thicker during moderate El Niños compared to extreme El Niños due to a deeper isothermal layer depth compared to the density defined mixed layer depth. Moreover, in the western and central Pacific Ocean, the anomalous zonal eastward current related to the westerly wind event that initiates El Niños is found to be stronger during extreme El Niños, advecting the thicker BLs from west to east. A salinity budget suggests that during both moderate and extreme El Niño events, surface freshwater flux dominates at the equator. During extreme El Niños, the change in the freshwater flux drives a strong surface jet in the far western Pacific at 1°S, 156°E. North of the equator, the surface freshwater flux largely dampens this advective impact. Thus during the different El Niño strengths, the BL distribution, evolution and impact are also different. This suggests that climate models need to better distinguish different types of El Niño events in order to simulate the ENSO dynamics correctly. © 2021. The Authors.
英文关键词	barrier layer thickness; extreme El Niño; heat flux; salinity budget analysis; zonal current
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186294
作者单位	Oceanography Remote Sensing & Assimilation, University of Hamburg, Hamburg, Germany; Scripps Institution of Oceanography, La Jolla, CA, United States; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
推荐引用方式 GB/T 7714	Zhang X.,Sprintall J.,Zeng L.. What Role Does the Barrier Layer Play During Extreme El Niño Events?[J],2021,126(5).
APA	Zhang X.,Sprintall J.,&Zeng L..(2021).What Role Does the Barrier Layer Play During Extreme El Niño Events?.Journal of Geophysical Research: Oceans,126(5).
MLA	Zhang X.,et al."What Role Does the Barrier Layer Play During Extreme El Niño Events?".Journal of Geophysical Research: Oceans 126.5(2021).