Seasonal differences in tropical cyclone–induced sea surface cooling in the western North Pacific

IF 3 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES

Quarterly Journal of the Royal Meteorological Society Pub Date : 2023-10-26 DOI:10.1002/qj.4606

Vineet Kumar Singh, Hye‐Ji Kim, Il‐Ju Moon

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Abstract

Abstract Tropical cyclone (TC)‐induced sea surface temperature (SST) cooling plays an important role in controlling the intensity of TCs in ocean basins and can modulate the local weather. This study examined the seasonal differences in TC‐induced SST cooling, especially between summer (June–August) and autumn (September–November), in the western North Pacific for the period 1992–2021. The analysis shows that the average maximum TC‐induced SST cooling along the TC track in autumn is 0.18°C less than in summer, although the mean TC intensity in autumn is 14 knots higher than in summer. This is because in autumn, the average mixed layer depth is 10–13 m deeper than in summer, and the TC track shifts equatorward, preventing the entrainment of cooler subsurface water to the surface, thereby causing less SST cooling in autumn at the same TC intensity. Given the negative feedback of TC‐induced SST cooling on TC intensity, these results are crucial to understand the seasonal differences in the intensity of TC in this basin. This article is protected by copyright. All rights reserved.

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北太平洋西部热带气旋引起的海面冷却的季节差异

热带气旋(TC)诱导的海表温度(SST)冷却在控制海洋盆地TC强度和调节当地天气方面起着重要作用。本研究考察了1992-2021年期间北太平洋西部高温诱发海温降温的季节差异，特别是夏季(6 - 8月)和秋季(9 - 11月)之间的差异。分析表明，秋季沿TC路径的最大平均温度冷却比夏季低0.18°C，但平均TC强度比夏季高14节。这是因为在秋季，平均混合层深度比夏季深10-13 m, TC轨道向赤道移动，阻止了较冷的地下水夹带到地面，从而导致在相同TC强度下，秋季海温冷却较少。考虑到高温引起的海温冷却对高温强度的负反馈，这些结果对于理解该盆地高温强度的季节差异至关重要。这篇文章受版权保护。版权所有。

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来源期刊

Quarterly Journal of the Royal Meteorological Society 地学-气象与大气科学

CiteScore

16.80

自引率

4.50%

发文量

163

审稿时长

3-8 weeks

期刊介绍： The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.