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Climate change-induced high-altitude lake: Hydrochemistry and area changes of a moraine-dammed lake in Leh-Ladakh

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Abstract

Himalayan glaciers are retreating, and glacial lakes are evolving and proliferating as a result of climate change. Glacier retreat marks in the formation and expansion, and sometimes outburst of moraine-dammed lakes. Lato Lake is one of the high-altitude and unexplored glacial lakes upstream of Gya-Miru village in the Leh-Ladakh region. This study is the first of its kind to assess hydrogeochemistry (HCO3−, SO42−, NO3, Cl, F, Ca2+, Mg2+, Na+, and K+) and studying the dynamics of a moraine-dammed lake in the Ladakh Himalayas. We observed substantial expansion of Lato Lake over the past 50 years between 1969 and 2019, and the areas of the lake have increased while the glacier area is reduced by 16.4% and 4.15%, respectively. The pH values ranging from 7.6 to 8.1 show slightly alkaline. HCO3, Ca2+, and SO42− were the most dominant ions during the study period 2018–19. The high (Ca2+  + Mg2+) and a low (Na+  + K+) ratio to the total cations show that Lato Lake receives ions from rock weathering, primarily from carbonate rocks. Gibbs and Na-Mixing plot also support the hydrogeochemistry of lake water was primarily controlled by rock weathering. HYSPILT backward trajectory model suggested that atmospheric input mainly originated from the seawater vapor transported by the summer monsoonal and westerly circulation systems. Results show that the lake has a substantial impact on the long-range transport of ocean water relative to local interferences.

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source in the study area

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Acknowledgements

We thank Professor A.L Ramanathan, Chandranath Chatterjee, and Jawaharlal Nehru University, New Delhi, for providing all the facilities to carrying out this work. The authors are grateful to Central Instruments Facility-School of Environmental Science, Jawaharlal Nehru University, New Delhi, for providing the facilities to analyze the samples.

Funding

This work was financially supported by National Centre for Polar and Ocean Research (NCPOR) under the HiCOM project (PAC-SES-ALR_NCPOR- (MoES) 03180321–1108/ Sanction Order no. 721/2018) and the Ministry of Earth Sciences (MoES) Government of India.

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Contributions

HK, ALR, MS, and MSS conceptualized the study. ALR supervised the study. HK, KB, CS, and AM performed the analysis, developed the figures, and wrote the paper. All authors contributed significantly in fieldwork and to improve the draft manuscript.

Corresponding author

Correspondence to AL. Ramanathan.

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The authors declare no conflict of interest.

Additional information

Communicated by Prof. Robert Bialik, (ASSOCIATE EDITOR), Dr. Michael Nones, (CO-EDITOR-IN-CHIEF).

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Kaushik, H., Ramanathan, A., Soheb, M. et al. Climate change-induced high-altitude lake: Hydrochemistry and area changes of a moraine-dammed lake in Leh-Ladakh. Acta Geophys. 69, 2377–2391 (2021). https://doi.org/10.1007/s11600-021-00670-x

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  • DOI: https://doi.org/10.1007/s11600-021-00670-x

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