Rainstorm characteristics using MESO-scale rain gauge NETwork (MESONET) over Mumbai

IF 6 2区工程技术 Q1 ENVIRONMENTAL SCIENCES

Urban Climate Pub Date : 2025-04-02 DOI:10.1016/j.uclim.2025.102385

Chiranjeevi Guttula, K. Sunilkumar, Subrata Kumar Das

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引用次数: 0

Abstract

MESO-scale rain gauge NETwork (MESONET) is a dense rain gauge network established across Mumbai. This work investigates the rainstorms speed and direction, using MESONET data during the monsoon (June–September) in 2020–2022. Rainstorm mean speed and direction are derived using the rainfall time series data i.e., peak of rainfall (T_p), centroid of hyetograph (T_c), and 50 % of the rainfall data (T_m). Results suggest that the mean rainstorm speed and direction derived by MESONET observations using T_p, T_c, and T_m are 10.3, 17.4 and 13.9 km/h, and 260, 260, and 253 degrees, respectively. Rainstorm speeds computed from T_c are higher than those calculated from T_p and T_m. Very heavy and extremely heavy rainfall events depict slower speeds than heavy and moderate rainfall events. Rainstorms often move in southwesterly and northwesterly directions. Comparison with reanalysis data, ERA5, indicate that the estimated rainstorm speed and direction mainly follow the mean layer (850–650 hPa) monsoon winds. Significant Ratio (SR), which indicate the accuracy of observed rainstorm speed and direction, shows that the rainstorm speed and direction estimated by T_c are more significant than those of T_p and T_m. The average SR values of T_p, T_c and T_m are 0.59, 0.49, and 0.51, respectively.

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利用中尺度雨量计网络（MESONET）在孟买的暴雨特征

MESO-scale rain gauge NETwork （MESONET）是一个在孟买建立的密集雨量测量网络。本文利用MESONET在2020-2022年季风（6 - 9月）期间的数据研究了暴雨的速度和方向。暴雨平均速度和方向是利用降雨时间序列数据，即雨量峰值（Tp）、雨量计质心（Tc）和50%的降雨数据（Tm）得出的。结果表明，利用Tp、Tc和Tm进行MESONET观测得到的平均暴雨速度和方向分别为10.3、17.4和13.9 km/h， 260、260和253度。Tc计算的暴雨速度高于Tp和Tm计算的暴雨速度。非常强和极端强降雨事件的速度比强和中等降雨事件慢。暴雨常向西南和西北方向移动。与ERA5再分析资料的比较表明，此次暴雨的速度和方向主要遵循平均层（850 ~ 650 hPa）季风。显著比（SR）表明，Tc对暴雨速度和方向的预测比Tp和Tm的预测更为显著。Tp、Tc和Tm的平均SR值分别为0.59、0.49和0.51。

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

Urban Climate Social Sciences-Urban Studies

CiteScore

9.70

自引率

9.40%

发文量

286

期刊介绍： Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following: Urban meteorology and climate[...] Urban environmental pollution[...] Adaptation to global change[...] Urban economic and social issues[...] Research Approaches[...]