我们对北极亚极地地区翻转的看法发生了巨变。

A sea change in our view of overturning in the subpolar North Atlantic.

作者信息

Lozier M S, Li F, Bacon S, Bahr F, Bower A S, Cunningham S A, de Jong M F, de Steur L, deYoung B, Fischer J, Gary S F, Greenan B J W, Holliday N P, Houk A, Houpert L, Inall M E, Johns W E, Johnson H L, Johnson C, Karstensen J, Koman G, Le Bras I A, Lin X, Mackay N, Marshall D P, Mercier H, Oltmanns M, Pickart R S, Ramsey A L, Rayner D, Straneo F, Thierry V, Torres D J, Williams R G, Wilson C, Yang J, Yashayaev I, Zhao J

机构信息

Division of Earth and Ocean Sciences, Duke University, Durham, NC, USA.

National Oceanography Centre, Southampton, UK.

出版信息

Science. 2019 Feb 1;363(6426):516-521. doi: 10.1126/science.aau6592.

DOI:10.1126/science.aau6592

PMID:30705189

Abstract

To provide an observational basis for the Intergovernmental Panel on Climate Change projections of a slowing Atlantic meridional overturning circulation (MOC) in the 21st century, the Overturning in the Subpolar North Atlantic Program (OSNAP) observing system was launched in the summer of 2014. The first 21-month record reveals a highly variable overturning circulation responsible for the majority of the heat and freshwater transport across the OSNAP line. In a departure from the prevailing view that changes in deep water formation in the Labrador Sea dominate MOC variability, these results suggest that the conversion of warm, salty, shallow Atlantic waters into colder, fresher, deep waters that move southward in the Irminger and Iceland basins is largely responsible for overturning and its variability in the subpolar basin.

摘要

为了给政府间气候变化专门委员会关于21世纪大西洋经向翻转环流（MOC）减缓的预测提供观测依据，2014年夏季启动了亚极地北大西洋翻转计划（OSNAP）观测系统。首个21个月的记录显示，翻转环流变化很大，它负责跨OSNAP线的大部分热量和淡水输送。以往观点认为拉布拉多海深水形成的变化主导了MOC的变化，而这些结果与之不同，表明温暖、咸的浅大西洋水转化为在伊尔明厄海盆和冰岛海盆向南流动的更冷、更新鲜的深水，在很大程度上导致了亚极地海盆的翻转及其变化。