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Reanalysing the 2007–19 glaciological mass-balance series of Mera Glacier, Nepal, Central Himalaya, using geodetic mass balance

Abstract : The 2007–19 glaciological mass-balance series of Mera Glacier in the Everest Region, East Nepal, is reanalysed using the geodetic mass balance assessed by differencing two DEMs obtained from Pléiades stereo-images acquired in November 2012 and in October 2018. The glaciological glacier-wide annual mass balance of Mera Glacier has to be systematically decreased by 0.11 m w.e. a−1 to match the geodetic mass balance. We attribute part of the positive bias of the glaciological mass balance to an over-estimation of the accumulation above 5520 m a.s.l., likely due to a measurement network unable to capture its spatial variability. Over the period 2007–19, Mera Glacier has lost mass at a rate of −0.41 ± 0.20 m w.e. a−1, in general agreement with regional averages for the central Himalaya. We observe a succession of negative mass-balance years since 2013.
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https://hal-cnrs.archives-ouvertes.fr/hal-03036950
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Submitted on : Wednesday, December 2, 2020 - 10:28:22 PM
Last modification on : Thursday, December 10, 2020 - 11:02:03 AM

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Patrick Wagnon, Fanny Brun, Arbindra Khadka, Etienne Berthier, Dibas Shrestha, et al.. Reanalysing the 2007–19 glaciological mass-balance series of Mera Glacier, Nepal, Central Himalaya, using geodetic mass balance. Journal of Glaciology, International Glaciological Society, 2020, pp.1-9. ⟨10.1017/jog.2020.88⟩. ⟨hal-03036950⟩

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