Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao, China. Department of Applied Mathematics, University of Washington, Seattle, WA, USA.
Department of Applied Mathematics, University of Washington, Seattle, WA, USA.
Science. 2014 Aug 22;345(6199):897-903. doi: 10.1126/science.1254937.
A vacillating global heat sink at intermediate ocean depths is associated with different climate regimes of surface warming under anthropogenic forcing: The latter part of the 20th century saw rapid global warming as more heat stayed near the surface. In the 21st century, surface warming slowed as more heat moved into deeper oceans. In situ and reanalyzed data are used to trace the pathways of ocean heat uptake. In addition to the shallow La Niña-like patterns in the Pacific that were the previous focus, we found that the slowdown is mainly caused by heat transported to deeper layers in the Atlantic and the Southern oceans, initiated by a recurrent salinity anomaly in the subpolar North Atlantic. Cooling periods associated with the latter deeper heat-sequestration mechanism historically lasted 20 to 35 years.
在 20 世纪后期，随着更多热量留在近地表，全球快速变暖。而在 21 世纪，随着更多热量转移到更深的海洋，地表变暖减缓。我们利用原位和再分析数据来追踪海洋热量吸收的路径。除了此前关注的太平洋浅层类似拉尼娜的模式外，我们发现，大西洋和南大洋深层热量储存所导致的减缓主要是由北大西洋亚极地反复出现的盐度异常引发的。与后者更深层的热量储存机制相关的冷却期在历史上持续了 20 到 35 年。
