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Summer Monsoon Rainfall Variability Over Maharashtra, India

机译：印度马哈拉施特拉邦夏季季风降雨变化

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摘要

This paper presents the results of an analysis of the daily rainfall of 329 rain gauge stations data over Maharashtra, a state in India, during the summer monsoon season, June to September, for the 11 year period from 1998 to 2008. Mesoscale analysis of the daily rainfall data is performed by converting the station rainfall data into gridded format with 15 km resolution. Various statistics have been carried out over 35 districts of four meteorological subdivisions of the Maharashtra state to understand the spatio-temporal variability of rainfall. Variation of monthly mean rainfall for the four monsoon months and a season as whole is analyzed for different rainfall statistics such as mean rainfall, rainfall variability, rainy days, maximum daily rainfall and classification of rainy days. Seasonal rainfall is maximum over the Konkan region followed by the eastern Vidharbha region whereas Madhya Maharashtra as a rain shadow region receives less rainfall. The rainfall is highly variable over all of Maharashtra with the coefficient of variability of the daily rainfall varying between 100 and 300%. Seasonal distribution of the number of rainy days shows 90-100 over southern Konkan, 80-90 over northern Konkan, 50-60 over eastern Vidharbha, and the southeast Madhya Maharashtra has the lowest number of about 15-20 rainy days. The highest values of maximum daily rainfall are located over the Sindhudurg, Ratnagiri, Raigadh, Mumbai and Thane districts of the Konkan region followed by that over eastern Vidharbha. The rainfall data have been divided into three categories (moderate rainfall, heavy rainfall and extreme heavy rainfall) based upon seven categories used by the India Meteorological Department. Heavy rainfall zones lie over the southern Konkan region, whereas extreme heavy rainfalls occur over northern latitudes. The data used in this study is having high resolution and district wise analysis over Maharashtra state is extremely beneficial.
机译：本文介绍了1998年至2008年这11年的夏季季风季节（6月至9月）印度马哈拉施特拉邦329个雨量计站数据的日降水量分析结果。通过将站内降雨数据转换为15 km分辨率的网格格式来执行每日降雨数据。为了了解降雨的时空变化，已经对马哈拉施特拉邦四个气象分区的35个区进行了各种统计。分析了四个季风月份和整个季节的每月平均降雨量的变化，以获取不同的降雨统计数据，例如平均降雨量，降雨量变化，雨天，最大日降雨量和雨天分类。康坎地区的季节性降雨最大，其次是维德哈巴东部地区，而雨季地区的中央邦（Madhya Maharashtra）则降雨较少。整个马哈拉施特拉邦的降雨量变化很大，每日降雨量的变异系数在100％至300％之间。雨季数量的季节性分布显示，康康南部地区为90-100雨天，康康北部地区为80-90，维德哈巴东部地区为50-60，东南部中央邦（Madhya Maharashtra）的雨季最少，约为15-20雨天。每日最大降雨量的最高值位于Konkan地区的Sindhudurg，Ratnagiri，Raigadh，孟买和Thane地区，其次是Vidharbha东部。根据印度气象局使用的七个类别，降雨数据已分为三类（中度降雨，强降雨和极强降雨）。康干南部地区处于强降雨区，而北纬地区则出现强降雨。本研究中使用的数据具有高分辨率，对马哈拉施特拉邦进行区域明智的分析极为有益。

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