An assessment of the impact of oceanic initial conditions on the interaction of upper ocean with the tropical cyclones in the Arabian Sea

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-07-02 DOI:10.1080/1755876X.2019.1658567

Tanuja Nigam, K. Prakash, V. Pant

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引用次数: 7

Abstract

ABSTRACT The Regional Ocean Modelling System (ROMS) is utilised to estimate the cyclone-induced mixing and cooling associated with two tropical cyclones, namely Phet and Nilofar over the Arabian Sea (AS). Numerical experiments were carried out with realistic and idealistic oceanic conditions to assess the impact of oceanic initial condition and stratification on the interaction of upper ocean with the tropical cyclones in the AS. The model simulated profiles of temperature and baroclinic kinetic energy are analysed to examine the post-cyclonic cooling and vertical distribution of inertial kinetic energy which interacts with the upper-ocean stratification. Following the cyclone-induced upwelling, the inertial mixing acts to deepen the mixed layer depth (MLD) up to 50 and 100 m from its initial values of 15 and 22 m for the Phet and Nilofar, respectively. The analysis suggests that the combined effect of higher maximum sustained winds and slower translational speed of Nilofar cyclone leads to the excessive cooling (by 1.5°C) of the sea surface as compared to Phet. A decrement in the magnitude of cooling is observed when oceanic initial stratification was altered. The available baroclinic velocity shear at different depths found to modulate the magnitude of upper-ocean cooling in different model experiments.

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海洋初始条件对阿拉伯海上层海洋与热带气旋相互作用影响的评估

利用区域海洋模拟系统(ROMS)对阿拉伯海(AS)上的两个热带气旋Phet和Nilofar相关的气旋诱导混合和冷却进行了估计。在实际和理想海洋条件下进行了数值试验，以评估海洋初始条件和分层对上层海洋与热带气旋相互作用的影响。分析了模式模拟的温度和斜压动能剖面，探讨了气旋后的冷却和与上层海洋分层相互作用的惯性动能垂直分布。在气旋引起的上升流之后，惯性混合作用使Phet和Nilofar的混合层深度(MLD)分别从初始值15和22 m增加到50和100 m。分析表明，与Phet相比，Nilofar气旋较高的最大持续风和较慢的平移速度的综合作用导致海面过度冷却(1.5°C)。当海洋初始分层发生改变时，可观察到降温幅度的减小。在不同的模式实验中发现，不同深度的可用斜压速度切变可以调节上层海洋冷却的幅度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.