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Relation Between the Rainfall and Soil Moisture During Different Phases of Indian Monsoon

机译：印度季风不同阶段降雨与土壤水分的关系

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摘要

Abstract Soil moisture is a key parameter in the prediction of southwest monsoon rainfall, hydrological modelling, and many other environmental studies. The studies on relationship between the soil moisture and rainfall in the Indian subcontinent are very limited; hence, the present study focuses the association between rainfall and soil moisture during different monsoon seasons. The soil moisture data used for this study are the ESA (European Space Agency) merged product derived from four passive and two active microwave sensors spanning over the period 1979–2013. The rainfall data used are India Meteorological Department gridded daily data. Both of these data sets are having a spatial resolution of 0.25° latitude–longitude grid. The study revealed that the soil moisture is higher during the southwest monsoon period similar to rainfall and during the pre-monsoon period, the soil moisture is lower. The annual cycle of both the soil moisture and rainfall has the similitude of monomodal variation with a peak during the month of August. The interannual variability of soil moisture and rainfall shows that they are linearly related with each other, even though they are not matched exactly for individual years. The study of extremes also exhibits the surplus amount of soil moisture during wet monsoon years and also the regions of surplus soil moisture are well coherent with the areas of high rainfall.
机译：摘要土壤水分是西南季风降雨，水文建模和许多其他环境研究预测的关键参数。印度次大陆土壤水分与降雨关系的研究非常有限;因此，本研究侧重于不同季风季节降雨与土壤水分之间的关​​联。用于本研究的土壤湿度数据是ESA（欧洲空间机构）合并的产品来自于1979 - 2013年期间的四个被动和两个有源微波传感器的产品。使用的降雨数据是印度气象部门网格日常数据。这两个数据集都具有0.25°纬度 - 经度网格的空间分辨率。该研究表明，在西南季风期内土壤水分较高，类似于降雨和季风前期，土壤水分较低。土壤水分和降雨的年度周期具有单片式变异的模拟，8月份的峰顶。土壤湿度和降雨的续变性表明它们彼此线性相关，即使它们与个体多年不匹配。对极端的研究也表现出湿季风年期间土壤水分的剩余量，并且剩余土壤水分区的区域与高降雨量的区域很好。

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