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首页> 外文期刊>Trends in Ecology & Evolution >Monsoonal Influences on Offshore Rapid Intensification of Landfalling Typhoons in a Sheared Environment over the South China Sea
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Monsoonal Influences on Offshore Rapid Intensification of Landfalling Typhoons in a Sheared Environment over the South China Sea

机译：南海剪切环境中陆上海上近海流量的季风快速增强

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摘要

Tropical cyclones (TCs) formed in the western North Pacific and South China Sea can undergo rapid intensification (RI) shortly before making landfall in China. Forecasting such offshore RI is a great challenge in operations. In this study the offshore RI events in a sheared environment are examined for TCs that made landfall in China during 1979-2017. It is found that there were only three offshore RI events in a sheared environment, all of which occurred to the south of Hainan Island within the monsoon trough in early to mid-July, coinciding with the termination of the mei-yu season. The specific geographic location and timing of the occurrence of the offshore RI in the sheared environment is associated with the adjustment of the East Asia summer monsoon system when the mei-yu season terminates in the Yangtze River valley. In addition to the adjustment favorable for TC intensification by enhancing the TC-trough interaction in the upper troposphere, this study suggests that two environmental factors also contribute to the offshore RI over the South China Sea in a sheared environment. One is the intrusion of dry air associated with the western North Pacific subtropical high (WNPSH) and the other is the penetration of the water vapor flux associated with the monsoon surge. The adjustment of the East Asia summer monsoon system allows the water vapor flux of the monsoon surge to penetrate the TC circulation and prevents the dry air of the WNPSH from intruding into the TC circulation.
机译：在中国西部北太平洋和南海的热带气旋（TCS）可以在中国登陆前不久经历快速增长（RI）。预测此类离岸RI在运营中是一个巨大的挑战。在这项研究中，在1979 - 2017年期间检查了剪切环境中的离岸RI事件，以便在中国在中国登陆的TC。发现只有三个剪切环境中的海上ri事件，所有这些都发生在季风岛的海南岛南部，于7月中旬到7月中旬，恰逢梅玉季的终止。在剪切环境中，在剪切环境中发生海上RI的特定地理位置和时序与东亚夏季季风系统的调整有关，当时梅玉季季节终止于长江山谷。除了通过增强上层对流层中的TC-Trouge相互作用有利的调整，这项研究表明，两个环境因素也有助于剪切环境中南海的海上ri。一个是与西北太平洋亚热带高（WNPSH）相关的干燥空气的侵入，另一个是与季风涌涌相关的水蒸气通量的渗透。东亚夏季季风系统的调整允许季风涌动的水蒸气通量渗透TC循环，并防止WNPSH的干燥空气侵入TC循环。

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