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Decadal trends in precipitable water vapor over the Indus River Basin using ERA5 reanalysis data

Journal of Mountain Science 2023年第10期20卷 2928-2945页

作者： Seema RANI Jyotsna SINGH Subhash SINGH Purushottam tiwari Suraj mal Department of Geography Institute of ScienceBanaras Hindu UniversityUttar Pradesh 221005India Department of Geography Shaheed Bhagat Singh CollegeUniversity of DelhiNew Delhi 110017India Center for the Study of Regional Development Jawaharlal Nehru UniversityNew DelhiDelhi 11oo6zIndia

Precipitable Water Vapor(PWV)constitutes a pivotal parameter within the domains of atmospheric science,and remote sensing due to its profound influence on Earth’s climate dynamics and weather *** exerts a significant impact on atmospheric stability absorption and emission of radiation,thus engendering alterations in the Earth’s radiative *** such,precise quantification of PWV holds the potential to enhance weather prognostication and fortify preparedness against severe meteorological *** study aimed to elucidate the spatial and temporal changes in seasonal and annual PWV across the Indus River Basin and its sub-basins using ERA5 reanalysis *** present study used ERA5 PWV(entire atmospheric column),air temperature at 2 m(t2m)and 500 hPa(T_500hPa),evapotranspiration,and total cloud cover data from 1960 to *** Sen slope estimator and Mann-kendall test were used for trend *** and multiple regression methods were used to understand the association of PWV with other *** findings have unveiled the highest increase in mean PWV during the monsoon(0.40 mm/decade),followed by premonsoon(0.37 mm/decade),post-monsoon(0.27 mm/decade),and winter(0.19 mm/decade)throughout the study ***,the mean PWV exhibited the most pronounced positive trend in the sub-basin Lower Indus(LI),followed by Panjnad(P),kabul(k),and Upper Indus(UI)across all seasons,except *** PWV has also risen in the Indus basin and its sub-basins over the last six *** exhibits a consistent upward trend up to an elevation of 3500 m within the basin which is most pronounced during the monsoon season,followed by the *** escalating PWV within the basin is reasonably ascribed to increasing air temperatures,augmented evapotranspiration,and heightened cloud *** findings hold potential utility for pertinent authorities engaged in water resource management and planning.

关键词： Himalaya Precipitable Water Vapor Indus River Basin Atmosphere Climate Change ERA5 Reanalysis data

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