Momentum budget analysis of maintenance of Arabian Sea tropical cyclone Ockhi

IF 0.7 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

MAUSAM Pub Date : 2023-12-31 DOI:10.54302/mausam.v75i1.5374

J. P S

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引用次数: 0

Abstract

In this study an effort is done to explain the maintenance of the Very Severe Cyclonic Storm(VSCS) Ockhi using the angular momentum(AM) budget technique . The AM budget equation for a region bounded by , to and to in (x,y,p,t) co-ordinate system is used from an earlier study. The different terms are explained with relative importance. This technique is used to the diagnosis of different small, medium and large weather systems by several authors. The Very Severe Cyclonic Storm(VSCS) Ockhi –a rare situation in Arabian Sea – is studied with a reanalyzed dataset in a fine mesh width. The values of different terms in the AM budget equation are calculated for pressure levels-1000,800,500,200,100hpa’s and for four day periods viz. 30 Nov ,01 Dec ,02 Dec and 03 Dec 2017 .The AM budget was prepared for the eight observation time periods of 00, 03,06,09,12,15,18,21 UTC for each day. The area selected is 5.04N - 19.2N, 60E- 77E where VSCS TC Ockhi formed.The sink and source terms are compared and the results are correlated with the help of charts . The NCMRWF IMDAA data set is used and the results are depicted in charts and results are compared with the observed synoptic behavior of the system . Keywords: - Angular Momentum Budget, Equation, Source/Sink terms, VSCS Ockhi-Diagnosis

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阿拉伯海热带气旋 "奥基 "的维持动量预算分析

本研究利用角动量（AM）预算技术来解释特强气旋风暴（VSCS）Ockhi 的维持情况。角动量预算方程适用于以 (x,y,p,t) 坐标系中的 , to 和 to 为边界的区域。对不同术语的相对重要性进行了解释。多位学者将这一技术用于诊断不同的小型、中型和大型天气系统。阿拉伯海罕见的非常严重的气旋风暴（VSCS）Ockhi 就是利用细网格宽度的重新分析数据集进行研究的。AM 预算方程中不同项的值是根据 1000、800、500、200、100 hpa 的压力水平和 2017 年 11 月 30 日、12 月 1 日、12 月 2 日和 12 月 3 日这四天的情况计算的。AM 预算是根据每天 00、03、06、09、12、15、18、21 UTC 这八个观测时段编制的。所选区域为 5.04N - 19.2N，60E- 77E，VSCS TC Ockhi 在此形成。使用了 NCMRWF IMDAA 数据集，将结果绘制成图表，并将结果与观测到的系统天气行为进行比较。关键词- 角动量预算、方程、源/汇项、VSCS Ockhi-Diagnosis

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

MAUSAM 地学-气象与大气科学

CiteScore

1.20

自引率

0.00%

发文量

1298

审稿时长

6-12 weeks

期刊介绍： MAUSAM (Formerly Indian Journal of Meteorology, Hydrology & Geophysics), established in January 1950, is the quarterly research journal brought out by the India Meteorological Department (IMD). MAUSAM is a medium for publication of original scientific research work. MAUSAM is a premier scientific research journal published in this part of the world in the fields of Meteorology, Hydrology & Geophysics. The four issues appear in January, April, July & October.