Intra-Annual Variability of the Surface Ablation of the Aldegondabreen Glacier (Spitsbergen)

U. V. Prokhorova; Прохорова У. В.; A. V. Terekhov; Терехов А. В.; V. E. Demidov; Демидов В. Э.; B. V. Ivanov; Веркулич С. Р.; S. R. Verkulich; Иванов Б. В.

Intra-Annual Variability of the Surface Ablation of the Aldegondabreen Glacier (Spitsbergen)

Authors: Prokhorova U.V.¹, Terekhov A.V.¹, Demidov V.E.¹, Ivanov B.V.¹^,2, Verkulich S.R.¹
Affiliations:
1. Arctic and Antarctic Research Institute
2. Saint Petersburg State University
Issue: Vol 63, No 2 (2023)
Pages: 214-224
Section: Glaciers and ice sheets
URL: https://journals.eco-vector.com/2076-6734/article/view/659380
EDN: https://elibrary.ru/RVESBM
ID: 659380

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Abstract

The intra-annual variability of the surface ice ablation on the 5.5 km² Aldegondabreen glacier (Spitsbergen Island, Barentsburg area) is presented. The ice ablation was measured during five seasons (2018–2022) at the two stakes, installed in the lower part of the glacier and at the index site, where the amount of ablation numerically coincides with the glacier-averaged value with the r = 0.99 agreement. The temporal resolution of the ice ablation data is uneven and varies from 3 to 45 days. To carry out the correlation analysis, meteorological data from the automated weather station located near the glacier terminus are used. The ice ablation rates, obtained after normalization for the number of days between stake readings, have a tight correlation with both the air temperature and the downwelling shortwave radiation flux for most of the seasons, in 2018–2021 (r = 0.71–0.99). Surface air temperature and short-wave radiation are closely related; the above estimates indicate the leading role of short-wave radiation in the summer ablation of the glacier in the period 2018–2021. The year 2022 became anomalous, as the correlation with the shortwave radiation significantly decreased (r = 0.21–0.34). The European heat wave of 2022, which also affected the Svalbard archipelago, interrupted the ordinary intra-annual variability of the air temperature, causing the unprecedented ice melt on Aldegondabreen in September. The predicted increase in frequency and intensity of the future heat waves will result in an increased role of turbulent fluxes in the surface energy balance of the low-elevated Svalbard glaciers. The article demonstrates how the empirically identified dependencies can change from season to season in a non-stationary climate.

Keywords

Arctic, Svalbard, glacier mass balance, short-wave radiation, heat wave

References

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