气候变化领域集成服务门户(CCPortal): A Sea Surface Height Perspective on El Niño Diversity; Ocean Energetics; and Energy Damping Rates

CCPortal

DOI	10.1029/2019GL086742
	A Sea Surface Height Perspective on El Niño Diversity; Ocean Energetics; and Energy Damping Rates
	Shi J.; Fedorov A.V.; Hu S.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:7
英文摘要	Ocean energetics is a useful framework for understanding El Niño–Southern Oscillation; however, its key element, available potential energy (APE), requires accurate ocean subsurface data that are hard to measure. Here, we describe a sea surface height-based index, SSHI, that accurately captures APE variations and can be easily computed from satellite observations. Using SSHI, we obtain an observation-based estimate of the APE damping timescale of approximately 1.7 years, slightly longer than previous ocean reanalysis-based estimates. Furthermore, SSHI serves as an indicator for El Niño “flavors” while recording the relative strength of the thermocline feedback. SSHI captures a decadal shift in El Niño–Southern Oscillation properties in early 2000s, with a more tilted mean thermocline and weaker thermocline slope variations indicative of the “Central Pacific” El Niño type dominating the past two decades, whereas SSH averaged over the tropical Pacific (a proxy for upper-ocean heat content) shows a significant rising trend over this time. ©2020 The Authors.
英文关键词	Atmospheric pressure; Damping; Oceanography; Potential energy; Stream flow; Surface waters; Damping rate; Ocean energetics; Relative strength; Satellite observations; Sea surface height; Slope variations; Southern oscillation; Subsurface data; Nickel compounds; air-sea interaction; El Nino; El Nino-Southern Oscillation; potential energy; satellite data; sea surface height; thermocline; upper ocean; Pacific Ocean; Pacific Ocean (Central); Pacific Ocean (Tropical)
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170489
作者单位	Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Study, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China; Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States; LOCEAN/IPSL, Sorbonne University, Paris, France; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
推荐引用方式 GB/T 7714	Shi J.,Fedorov A.V.,Hu S.. A Sea Surface Height Perspective on El Niño Diversity; Ocean Energetics; and Energy Damping Rates[J],2020,47(7).
APA	Shi J.,Fedorov A.V.,&Hu S..(2020).A Sea Surface Height Perspective on El Niño Diversity; Ocean Energetics; and Energy Damping Rates.Geophysical Research Letters,47(7).
MLA	Shi J.,et al."A Sea Surface Height Perspective on El Niño Diversity; Ocean Energetics; and Energy Damping Rates".Geophysical Research Letters 47.7(2020).