气候变化领域集成服务门户(CCPortal): Dominant Terms in the Freshwater and Heat Budgets of the Subpolar North Atlantic Ocean and Nordic Seas From 1992 to 2015

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DOI	10.1029/2020JC016435
	Dominant Terms in the Freshwater and Heat Budgets of the Subpolar North Atlantic Ocean and Nordic Seas From 1992 to 2015
	Tesdal J.-E.; Haine T.W.N.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	The Arctic and subarctic oceans exhibit distinct decadal variations in freshwater and heat content. We describe freshwater and heat budgets with the ECCOv4 reanalysis product and compare budget variability and mechanisms within the subpolar North Atlantic Ocean, Nordic Seas, and Labrador Sea from 1992 to 2015. For all regions, changes in freshwater content are largely anticorrelated with changes in heat content. Since 1995, the subpolar North Atlantic Ocean has undergone a decade of warming and salinification followed by ongoing cooling and freshening. The recent increase in freshwater content and the reduction in heat in the subpolar North Atlantic can largely be attributed to anomalous circulation of mean salinity and temperature, respectively. Interannual variability in heat and freshwater mostly corresponds to boundary fluxes from the subtropics. Meanwhile, the Nordic Seas have undergone an overall warming and salinification from the mid-1990s to 2015. Salinification is primarily driven by reduced sea ice flux through Fram Strait, while warming is due to changes in both sea surface heating and advective flux. In the last 5 years, Labrador Sea freshwater convergence remained unchanged, as increased inflow via the Baffin Island Current is balanced by increased outflow via the Labrador Current. Hence, the observed freshening of the Arctic Ocean is expected to be an increasingly important source of future freshwater increases in the subpolar North Atlantic. This stands in contrast to variability in freshwater flux from the subtropical North Atlantic, which is associated with variability in the Atlantic Meridional Overturning Circulation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Atlantic Meridional Overturning Circulation; decadal variability; liquid freshwater content; Nordic Seas; ocean heat content; subpolar North Atlantic
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/186628
作者单位	Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, United States
推荐引用方式 GB/T 7714	Tesdal J.-E.,Haine T.W.N.. Dominant Terms in the Freshwater and Heat Budgets of the Subpolar North Atlantic Ocean and Nordic Seas From 1992 to 2015[J],2020,125(10).
APA	Tesdal J.-E.,&Haine T.W.N..(2020).Dominant Terms in the Freshwater and Heat Budgets of the Subpolar North Atlantic Ocean and Nordic Seas From 1992 to 2015.Journal of Geophysical Research: Oceans,125(10).
MLA	Tesdal J.-E.,et al."Dominant Terms in the Freshwater and Heat Budgets of the Subpolar North Atlantic Ocean and Nordic Seas From 1992 to 2015".Journal of Geophysical Research: Oceans 125.10(2020).