1993-2013 年期间黑潮路径上强度的多十年不一致趋势。

Discordant multi-decadal trend in the intensity of the Kuroshio along its path during 1993-2013.

机构信息

Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan.

出版信息

Sci Rep. 2018 Oct 2;8(1):14633. doi: 10.1038/s41598-018-32843-y.

DOI:10.1038/s41598-018-32843-y

PMID:30279522

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6168475/

Abstract

The Kuroshio transports warm water in the Pacific poleward from the tropics and plays a crucial role in modulating surrounding climate. Based on independent data sets, we demonstrated that the Kuroshio weakened downstream east of Taiwan, but intensified upstream east of Luzon Island during 1993-2013. The surface velocity (volume transport) of the Kuroshio has decreased 12.5% (4~~5%) off east Taiwan but increased 18% (8~~18%) off east Luzon. The discordant upstream-downstream trend was attributable to changes in oceanic eddies and basin surface winds: greater (lesser) cyclonic eddies, lesser (greater) anticyclonic eddies, and positive (negative) tendency in the Pacific Basin wind curl contributed to a weakened (intensified) downstream (upstream) Kuroshio. The difference in water mass between the upstream and downstream Kuroshio was balanced by an anomalous eastward flow, the southern branch of the Subtropical Counter Current which was enhanced and evacuated the redundant water eastward into the Pacific.

摘要

黑潮将温暖的水从热带输送到太平洋的极区，并在调节周围气候方面发挥着关键作用。基于独立的数据集，我们证明了 1993 年至 2013 年间，黑潮在台湾东部下游减弱，但在吕宋岛东部上游增强。黑潮的表面速度（体积输送）在台湾东部减少了 12.5%（4%至 5%），而在吕宋岛东部增加了 18%（8%至 18%）。这种上下游不一致的趋势归因于海洋涡流和盆地表面风的变化：更多（更少）的气旋涡，更少（更多）的反气旋涡，以及太平洋风卷曲率的正（负）趋势，导致下游（上游）黑潮减弱（增强）。上游和下游黑潮之间的水体差异通过异常的向东流来平衡，即亚热带逆流的南分支得到加强，并将多余的水向东排入太平洋。