Abstract
Hydroclimatic variations during the summer monsoon season (June–September) across the Himalaya are examined over the past several hundred years using tree-ring oxygen isotope records. Owing to their strong associations with hydroclimatic variables including precipitation, relative humidity, and the Palmer Drought Severity Index, tree-ring δ18O chronologies from the Himalaya can be used to reconstruct summer monsoon intensity precisely. A regional chronology derived from five local chronologies across the Himalaya shows a significant correlation with Indian summer rainfall data. One of the most noteworthy features of the regional chronology is a drying trend over the past 180 years, indicating that summer monsoon intensity in the Himalayan region has weakened. A declining land–ocean thermal gradient over South Asia seems to be responsible for the weakened summer monsoon. By analyzing spatio-temporal correlations between zonally distributed tree-ring data over the Himalaya, we also explore possible changes in the relative contributions of source water originating in the Arabian Sea and the Bay of Bengal.
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Sano, M., Xu, C., Dimri, A.P., Ramesh, R. (2020). Summer Monsoon Variability in the Himalaya Over Recent Centuries. In: Dimri, A., Bookhagen, B., Stoffel, M., Yasunari, T. (eds) Himalayan Weather and Climate and their Impact on the Environment . Springer, Cham. https://doi.org/10.1007/978-3-030-29684-1_14
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