The Gulf Stream and Kuroshio Current are synchronized
The Gulf Stream and Kuroshio Current are synchronized
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DOI：
10.1126/science.abh3295
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发表时间：
2021-10
期刊：
影响因子：
56.9
通讯作者：
T. Kohyama;Yoko Yamagami;H. Miura;S. Kido;H. Tatebe;Masahiro Watanabe
中科院分区：
文献类型：
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作者：
T. Kohyama;Yoko Yamagami;H. Miura;S. Kido;H. Tatebe;Masahiro Watanabe
描述 从远处看 墨西哥湾流和黑潮分别是西大西洋和太平洋的大型表面边界流。它们将热量从热带输送到温带，影响整个北半球的海面温度、天气和气候。小山等人。将卫星观测与模型实验相结合，表明这两种气流通过大气急流的经向迁移在十年时间尺度上同步（参见 Cessi 的观点）。这种耦合有助于解释气候事件，例如 2018 年北半球温带异常炎热的夏季。 —HJS 大气急流有助于同步湾流和黑潮的变化。观测表明，墨西哥湾流和黑潮海流沿岸的海面温度在十年时间尺度上趋于同步。这种同步，我们称之为边界流同步（BCS），在具有高空间分辨率的全球气候模型中重现。无论是在观测还是模型模拟中，BCS 都与大气急流的经向迁移有关。与急流移动相关的洋流强度和路径的变化导致表面温度的同步性。使用概念模型和大气环流模型的数值模拟与BCS是跨流域海气耦合模式的概念是一致的。与 BCS 相关的气温模式已被多次观察到，包括 1994 年 7 月和 2018 年。
Description Together from afar The Gulf Stream and the Kuroshio are the large surface boundary currents in the western Atlantic and Pacific Oceans, respectively. They transport heat from the tropics to the extratropics and influence sea surface temperature, weather, and climate throughout the Northern Hemisphere. Kohyama et al. combined satellite observations with model experiments to show that these two currents are synchronized on decadal time scales by the meridional migration of the atmospheric jet stream (see the Perspective by Cessi). This coupling can help to explain climate events such as the abnormally hot summer of 2018 in the Northern Hemispheric extratropics. —HJS The atmospheric jet stream helps to synchronize variations in the Gulf Stream and the Kuroshio. Observations show that sea surface temperatures along the Gulf Stream and the Kuroshio Current tend to synchronize at decadal time scales. This synchronization, which we refer to as the boundary current synchronization (BCS), is reproduced in global climate models with high spatial resolution. Both in observations and model simulations, BCS is associated with meridional migrations of the atmospheric jet stream. Changes in the strength and path of the ocean currents associated with the jet shifts lead to the synchronicity of surface temperatures. Numerical simulations using a conceptual model and an atmospheric general circulation model are consistent with a notion that BCS is an interbasin air-sea coupled mode. Air temperature patterns similar to the one associated with BCS have been repeatedly observed, including in July of 1994 and 2018.