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首页> 外文期刊>Natural Hazards and Earth System Sciences Discussions >Oceanic response to the consecutive Hurricanes Dorian and Humberto (2019) in the Sargasso Sea
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Oceanic response to the consecutive Hurricanes Dorian and Humberto (2019) in the Sargasso Sea

机译：在萨尔加索海中连续飓风和亨伯托（2019）的海洋反应

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Understanding the oceanic response to tropical cyclones (TCs) is of importance for studies on climate change. Although the oceanic effects induced by individual TCs have been extensively investigated, studies on the oceanic response to the passage of consecutive TCs are rare. In this work, we assess the upper-oceanic response to the passage of Hurricanes Dorian and Humberto over the western Sargasso Sea in 2019 using satellite remote sensing and modelled data. We found that the combined effects of these slow-moving TCs led to an increased oceanic response during the third and fourth post-storm weeks of Dorian (accounting for both Dorian and Humberto effects) because of the induced mixing and upwelling at this time. Overall, anomalies of sea surface temperature, ocean heat content, and mean temperature from the sea surface to a depth of 100?m were 50?%, 63?%, and 57?% smaller (more negative) in the third–fourth post-storm weeks than in the first–second post-storm weeks of Dorian (accounting only for Dorian effects), respectively. For the biological response, we found that surface chlorophyll?a (chl?a) concentration anomalies, the mean chl?a concentration in the euphotic zone, and the chl a concentration in the deep chlorophyll maximum were 16?%, 4?%, and 16?% higher in the third–fourth post-storm weeks than in the first–second post-storm weeks, respectively. The sea surface cooling and increased biological response induced by these TCs were significantly higher (Mann–Whitney test, p<0.05) compared to climatological records. Our climatological analysis reveals that the strongest TC-induced oceanographic variability in the western Sargasso Sea can be associated with the occurrence of consecutive TCs and long-lasting TC forcing.
机译：了解对热带气旋（TCS）的海洋反应对气候变化的研究具有重要性。虽然各种TCS诱导的海洋效应已被广泛研究，但对连续TCS通过的海洋反应的研究是罕见的。在这项工作中，我们在2019年使用卫星遥感和建模数据来评估飓风Dorian和Humberto在西部Sargasso海域通过的船上响应。我们发现，由于目前诱导的混合和上升，这些缓慢移动的TCS的综合影响导致了在Dorian的第三和第四个和第四个暴风雨周期内增加了海洋反应（占Dorian和Humberto效应）。总体而言，海面温度的异常，海洋热含量和海面的平均温度为100？m的深度为50？％，63μm，第三篇文章中的57？％（更负面） - 分别比在第一秒钟暴风雨周的Dorian暴风雨周期（仅适用于Dorian效应）。对于生物反应，我们发现表面叶绿素？A（CHL？a）浓度异常，平均chl？Euphotic区中的浓度，并且深叶绿素最大的浓度为16？％，4？％，在暴风雨后的第三周晚期比在第一秒钟暴风雨周期内，16？％较高。与气候记录相比，这些TCS诱导的海面冷却和增加的生物反应显着升高（Mann-Whitney试验，P <0.05）。我们的气候学分析表明，西部Sargasso海中最强的TC诱导的海洋变异性可以与连续TCS的发生和持久的TC强制相关联。

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