Surface-elevation changes and mass balance of the Academy of Sciences Ice Cap, Severnaya Zemlya
| Autor: | F. J. Navarro, P. Sánchez-Gámez, A. F. Glazovsky, C. Recio-Blitz |
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| Jazyk: | ruština |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Лëд и снег, Vol 60, Iss 1, Pp 29-41 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2076-6734 2412-3765 20766734 |
| DOI: | 10.31857/S2076673420010021 |
| Popis: | We have determined the surface-elevation change rates of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian Arctic, for two different periods: 2004–2016 and 2012/2013–2016. The former was calculated from differencing of ICESat and ArcticDEM digital elevation models, while the latter was obtained by differencing two sets of ArcticDEM digital elevation models. From these surface-elevation change rates we obtained the geodetic mass balance, which was nearly identical for both periods, at −1,72±0,67 Gt a−1, equivalent to −0,31±0,12 m w.e. a−1 over the whole ice cap area. Using an independent estimate of frontal ablation for 2016−2017 of −1,93±0,12 Gt a−1 (−0,31±0,12 m w.e. a−1), we get an estimate of the climatic mass balance not significantly different from zero, at 0,21±0,68 Gt a−1 (0,04±0,13 m w.e. a−1), which agrees with the near-zero average balance at a decadal scale observed during the last four decades. Making an observationally-based assumption on accumulation rate, we estimate the current total ablation from the ice cap, and its partitioning between frontal ablation, dominated by calving (~54%) and climatic mass balance, mostly surface ablation (~46%). |
| Databáze: | Directory of Open Access Journals |
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