Abstract The Kashmir Valley represents a critical region for understanding isotopic changes in the atmospheric moisture sources since it is located at the intercept between the influences of mid-latitude westerlies and the southwest monsoon circulation. This study presents the variation in isotopic composition (δ18O and δ2H) of daily precipitation samples collected from the Kashmir Valley, North-Western Himalaya, to quantify the effect of meteorological parameters, separately for the Southwest monsoon (SWM) season and the periods of Western Disturbances (WDs). The results suggest that precipitation isotopic composition is strongly modulated by temperature and relative humidity during the periods of WDs. Still, this dependency is weak in the case of the SWM season. Moisture transport pathways calculated from HYSPLIT back trajectory analysis shows a wide spatial variability during the monsoon season. On the other hand, the origin of moisture during the WD season was mostly restricted from the Mediterranean region, providing an explanation of a strong dependency between the precipitation isotopes and the meteorological parameters during the WD period. Such kind of relation may provide additional diagnostic for the WD events and may help in paleo-monsoon investigations.

中文翻译：

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印度西北部季风边缘地区以双重水分输送路径为特征的日降水同位素组成的控制

摘要 克什米尔河谷地处中纬度西风带与西南季风环流影响的交汇处，是了解大气水分源同位素变化的关键区域。本研究介绍了从喜马拉雅西北部克什米尔山谷收集的每日降水样本的同位素组成（δ18O 和 δ2H）的变化，以量化气象参数的影响，分别针对西南季风 (SWM) 季节和西部季风时期。干扰 (WD)。结果表明，WDs 期间降水同位素组成受温度和相对湿度的强烈调节。尽管如此，在 SWM 季节的情况下，这种依赖性很弱。从 HYSPLIT 后向轨迹分析计算的水分输送路径显示季风季节期间存在广泛的空间变异性。另一方面，WD 季节期间水分的来源主要限于地中海地区，这解释了 WD 期间降水同位素与气象参数之间的强烈依赖性。这种关系可以为WD事件提供额外的诊断，并可能有助于古季风调查。