Roy, N and Sen, IS and Boral, S and Shukla, T and Velu, V (2024) Isotope Hydrograph Separation Reveals Rainfall on the Glaciers Will Enhance Ice Meltwater Discharge to the Himalayan Rivers. In: Water Resources Research, 60 (6).
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Abstract
The Indian Summer Monsoon (ISM) and meltwater from the Himalayan are the two most important sources of water in the Indian subcontinent. However, the impact of ISM on Himalayan glaciers and subsequent stream hydrology remains largely unknown. To provide new insight into the impact of rainfall on glacial hydrology, here we present hydro-meteorological and time-series observations of meltwater stable water isotope compositions from the snout of the Chorabari glacier in the Upper Ganga Basin, Central Himalayas across the ablation season corresponding to 2019. We observe that rainfall events (>2 mm d�1) on the glacier enhance discharge driven by ice meltwater in River Mandakini. Energy balance calculations reveal that one of the drivers behind enhanced ice meltwater contribution could be rain-induced melting of the glacier where rainfall on the ice surface melts the glacier producing up to 13 of the total discharge at the glacier snout. Further, rainfall on glacier surface have other control on glacial processes�for example, snow metamorphism, ice flow dynamics such as short-term acceleration in ice speed flow, and reorganization of the englacial and subglacial drainage network�that are poorly studied and needs further investigation. We conclude rainfall events on the glacier have a complex control on mountain hydrology. This study, therefore, provides an interpretative framework that calls for additional assessments of the direct and indirect impact of rainfall in glacial hydrology. © 2024. The Authors.
| Item Type: | Journal Article |
|---|---|
| Publication: | Water Resources Research |
| Publisher: | John Wiley and Sons Inc |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Atmospheric thermodynamics; Glacial geology; Ice; Rain; Rivers, Glacial hydrology; Glacier meltwater; Himalayan glacier; Himalayan rivers; Hydrograph separation; Indian summer monsoon; Isotope mixing model; Melt-water discharges; Mixing modelling; Rainfall event, Isotopes |
| Department/Centre: | Division of Interdisciplinary Sciences > Interdisciplinary Centre for Water Research |
| Date Deposited: | 17 Aug 2024 12:08 |
| Last Modified: | 17 Aug 2024 12:08 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85459 |
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