ECS Awardee 2023: Chhota shigri glacier (India) Mass balance over 2002-2020: Evaluation and correction

Autor: Azam, M., Vincent, C., Berthier, E., Srivastava, S., Wagnon, P., Kaushik, H., Mandal, A., Alagappan, R.
Rok vydání: 2023
Zdroj: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
DOI: 10.57757/iugg23-4271
Popis: The mass balance observations have been carried out on Chhota Shigri Glacier since 2002. Due to difficult glacier accessibility, dynamics, and involvement of different researchers, the measurement network differs in space over time. Further, almost all glaciological mass balance series are affected by the systematic biases due to specifically designed point mass balance network, and lack of basal and internal mass loss measurements. The goal of this study is to re-analyze the mass balances on Chhota Shigri Glacier and provide a homogenized series. We applied the nonlinear model of Vincent and others (2018) to capture the spatiotemporal changes in point mass balances and re-estimated the annual glacier-wide mass balances over 2002-2020. The nonlinear model also allows to detect the erroneous point measurements which are either corrected from the field notebooks or removed from the analysis. The mass balances are then homogenized applying the areal changes estimated using SPOT5 (2005) and Pléiades images (2014 and 2020), assuming a linear areal change. Finally, the mass balances are adjusted using the geodetic mass balances estimated by differencing ASTER and Pléiades DEMs (Oct 2003–Sept 2014) and Pléiades DEMs (Sept 2014–Sept 2020). The reanalyzed mean annual glacier-wide mass balance is estimated to be –0.47 ± 0.18 m w.e. a−1 (equivalent to a cumulative mass loss of –8.40 m w.e.) with a standard deviation of 0.66 m w.e. a−1 over 2002-2020. The glacier lost maximum mass of –1.29 ± 0.16 m w.e. in 2017/18 while gained a mass of 0.49 ± 0.19 m w.e. in 2004/05.
The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
Databáze: OpenAIRE
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