Different mechanisms for enhanced ocean response and feedback during sequential super typhoons

IF 2.3 3区 地球科学 Q2 OCEANOGRAPHY Deep-Sea Research Part I-Oceanographic Research Papers Pub Date : 2024-07-10 DOI:10.1016/j.dsr.2024.104351
Wang Huipeng , Li Jiagen , Song Junqiang , Leng Hongze , Ren Kaijun , Wang Huizan , Zhang Ze , Wang Hanshi , Wang Chunming , Yu Jie , Yang Xiangrong
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Abstract

Relative to a single typhoon, the ocean response and feedback mechanisms during sequential super typhoon process have yet to be fully understood. The upper ocean responses to super typhoons Trami and Kong-Rey that occurred sequentially in autumn 2018 over the northwestern Pacific (NWP) Ocean were investigated using multi satellite and Argo float data. As a slow-moving typhoon, the location of maximum sea surface temperature (SST) cooling induced by Trami was determined by the typhoon's translation speed and the preexisting cyclonic eddy (CE). The most significant SST cooling was observed near the abrupt turning point, where Trami nearly stalled over the ocean, rather than in the CE region, although the CE could enhance the SST cooling. For the subsequent, fast-moving typhoon Kong-Rey, the most significant SST cooling was observed in the CE region. Two different mechanisms (i.e., slow translation and cyclonic eddy) for the enhancement of SST cooling, salinity and chlorophyll-a were also compared. For salinity and chlorophyll-a concentration, slow translation speed plays a more important role than the preexisting cold eddy. Additionally, both typhoons experienced rapid weakening, suggesting that typhoon-induced negative feedback affects not only the intensification of the typhoon itself but also the subsequent typhoon. An analysis of data from Argo floats demonstrated that weak mixing and upwelling contributed to a three-layer structure in the upper ocean temperature on the left side of the typhoon track; strong upwelling played a more important role in the cooling of the whole upper ocean near the typhoon track center; and strong vertical mixing was the dominant factor for the two-layer temperature structure on the right side.

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连续超强台风期间海洋响应和反馈增强的不同机制
相对于单个台风,连续超强台风过程中的海洋响应和反馈机制尚待充分了解。利用多卫星和Argo浮漂数据,研究了2018年秋季西北太平洋(NWP)海域连续发生的超强台风 "暹粒 "和 "康芮 "的上层海洋响应。作为一个缓慢移动的台风,"暹罗 "引起的最大海面温度(SST)冷却位置由台风的移动速度和预先存在的气旋涡(CE)决定。在 "暹罗 "的突然转向点附近("暹罗 "几乎停滞在海洋上空)观测到了最明显的海面温度降温,而不是在气旋漩涡区域,尽管气旋漩涡会增强海面温度降温。在随后快速移动的台风 "康芮 "中,CE 区域的海温冷却最为显著。此外,还比较了增强海温冷却、盐度和叶绿素-a 的两种不同机制(即慢速平移和气旋涡)。就盐度和叶绿素-a 浓度而言,慢平移速度比原有冷涡的作用更重要。此外,两个台风都经历了快速减弱,这表明台风引起的负反馈不仅影响台风本身的强度,也影响后续台风的强度。对 Argo 浮漂数据的分析表明,弱混合和上升流造成了台风路径左侧上层海洋温度的三层结构;强上升流对台风路径中心附近整个上层海洋的冷却起了更重要的作用;而强垂直混合则是右侧两层温度结构的主要因素。
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来源期刊
CiteScore
4.60
自引率
4.20%
发文量
144
审稿时长
18.3 weeks
期刊介绍: Deep-Sea Research Part I: Oceanographic Research Papers is devoted to the publication of the results of original scientific research, including theoretical work of evident oceanographic applicability; and the solution of instrumental or methodological problems with evidence of successful use. The journal is distinguished by its interdisciplinary nature and its breadth, covering the geological, physical, chemical and biological aspects of the ocean and its boundaries with the sea floor and the atmosphere. In addition to regular "Research Papers" and "Instruments and Methods" papers, briefer communications may be published as "Notes". Supplemental matter, such as extensive data tables or graphs and multimedia content, may be published as electronic appendices.
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