Marine Heatwaves in the East Australian Current Modulated by Mesoscale Eddies

IF 3.4 2区 地球科学 Q1 OCEANOGRAPHY
Christopher C. Chapman, Bernadette M. Sloyan, Thomas S. Moore II, John A. Reilly, Richard J. Matear
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Abstract

Marine heatwaves (MHWs), defined as periods of persistently elevated ocean temperatures, are investigated along the east coast of Australia. These events are shown to occur as a result of interactions between mesoscale eddies and the East Australian Current (EAC), a poleward flowing western boundary current that transports heat from warmer subtropical seas to cooler temperate latitudes. We show that mesoscale eddies are able to enhance the poleward transport of warm water by the EAC. By reinforcing the southward flow of the EAC, eddies induce strong north-south connectivity during MHW events, with swaths of the shelf and adjacent seas spanning up to 10 ° ${}^{\circ}$ of latitude exposed to extreme temperatures simultaneously. The eddy signature of MHWs are detectable by as much as 40 days prior to the peak of any particular event. We discuss the implications of our results as a pathway toward early detection and prediction of extreme ocean conditions in boundary current regions.

Abstract Image

由中尺度涡旋调制的东澳大利亚海流中的海洋热浪
海洋热浪(MHWs)被定义为海洋温度持续升高的时期,在澳大利亚东海岸进行了调查。这些事件的发生是由于中尺度涡旋和东澳大利亚洋流(EAC)之间相互作用的结果,东澳大利亚洋流是一种向极地流动的西部边界洋流,将热量从温暖的亚热带海洋输送到凉爽的温带地区。研究表明,中尺度涡旋能够增强暖流通过东太平洋向极地的输送。通过加强东大陆架向南的流动,涡旋在MHW事件期间诱发了强烈的南北连通性,使大陆架和邻近海域跨越高达10°${}{\circ}$的纬度同时暴露在极端温度下。在任何特定事件达到峰值前40天,就可以探测到强震的涡旋特征。我们讨论了我们的结果作为早期检测和预测边界流区域极端海洋条件的途径的含义。
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来源期刊
Journal of Geophysical Research-Oceans
Journal of Geophysical Research-Oceans Earth and Planetary Sciences-Oceanography
CiteScore
7.00
自引率
13.90%
发文量
429
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