气候变化领域集成服务门户(CCPortal): The Global Sink of Available Potential Energy by Mesoscale Air-Sea Interaction

CCPortal

DOI	10.1029/2020MS002118
	The Global Sink of Available Potential Energy by Mesoscale Air-Sea Interaction
	Bishop S.P.; Small R.J.; Bryan F.O.
发表日期	2020
ISSN	19422466
卷号	12 期号:10
英文摘要	The thermal component of oceanic eddy available potential energy (EPE) generation due to air-sea interaction is proportional to the product of anomalous sea surface temperature (SST) and net air-sea heat flux (SHF). In this study we assess EPE generation and its timescale and space-scale dependence from observations and a high-resolution coupled climate model. A dichotomy exists in the literature with respect to the sign of this term, that is, whether it is a source or a sink of EPE. We resolve this dichotomy by partitioning the SST and net heat flux into climatological mean, climatological seasonal cycle, and remaining transient contributions, thereby separating the mesoscale eddy variability from the forced seasonal cycle. In this decomposition the mesoscale air-sea SST-SHF feedbacks act as a 0.1 TW global sink of EPE. In regions of the ocean with a large seasonal cycle, for example, midlatitudes of the Northern Hemisphere, the EPE generation by the forced seasonal cycle exceeds the mesoscale variability sink, such that the global generation by seasonal plus eddy variability acts as a 0.8 TW source. EPE destruction is largest in the midlatitude western boundary currents due to mesoscale air-sea interaction and in the tropical Pacific where SST variability is due mainly to the El Niño–Southern Oscillation. The EPE sink in western boundary currents is spatially aligned with SST gradients and offset to the poleward side of currents, while the mean and seasonal generation are aligned with the warm core of the current. By successively smoothing the data in space and time we find that half of the EPE sink is confined to timescales less than annual and length scales less than 2°, within the oceanic mesoscale band. ©2020. The Authors.
语种	英语
scopus关键词	Atmospheric pressure; Climate models; Heat flux; Molecular physics; Potential energy; Surface waters; Air sea interactions; Coupled climate model; Mesoscale air-sea interaction; Mesoscale variability; Northern Hemispheres; Sea surface temperature (SST); Southern oscillation; Western boundary currents; Oceanography; air-sea interaction; climate modeling; El Nino-Southern Oscillation; heat flux; mesoscale eddy; Northern Hemisphere; potential energy; seasonal variation; western boundary current; Pacific Ocean; Pacific Ocean (Tropical)
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156602
作者单位	Department of Marine, Earth, & Atmospheric Sciences, North Carolina State University at Raleigh, Raleigh, NC, United States; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Bishop S.P.,Small R.J.,Bryan F.O.. The Global Sink of Available Potential Energy by Mesoscale Air-Sea Interaction[J],2020,12(10).
APA	Bishop S.P.,Small R.J.,&Bryan F.O..(2020).The Global Sink of Available Potential Energy by Mesoscale Air-Sea Interaction.Journal of Advances in Modeling Earth Systems,12(10).
MLA	Bishop S.P.,et al."The Global Sink of Available Potential Energy by Mesoscale Air-Sea Interaction".Journal of Advances in Modeling Earth Systems 12.10(2020).