Glacier Changes on the Pik Topografov Massif, East Sayan Range, Southeast Siberia, from Remote Sensing Data

Osipov, E. Yu.; Осипова, О. П.

doi:10.3390/geosciences8050148

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…East Sayan is one of the centers of mountain glaciation in southern Siberia. There are about 270 small glaciers with total area of about 20 km 2 (Osipov et al, 2017). Due to recent climate change, the glaciers are intensively shrinking since the end of the Little Ice Age Osipova, 2014, 2018).…”

Section: Study Area and Methodsmentioning

confidence: 99%

Moisture sources and synoptic conditions of summer precipitation in the glacial zone of the East Sayan Range

Osipov

Осипова

2020

Adv. Sci. Res.

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Abstract. Precipitation in high-mountain regions is characterized by a strong heterogeneity due to complex interaction between atmospheric circulation and steep topography, however, extremely rare network of high elevation stations hampers the adequate high resolution regional climate modeling. In this study we present new data of precipitation directly measured in high-mountain catchment, on the continental glacier (East Sayan Range, south of East Siberia) during the summer periods of 2015–2017 using automatic weather station. The precipitation record was compared with near located weather stations and ERA Interim and NCEP/NCAR reanalysis data. Precipitation mode similar to the glacier site was found at the stations located west and northwest, while ERA Interim and NCEP/NCAR reanalysis data underestimated the precipitation by 40 % and 70 %, respectively. Atmospheric circulation patterns in days with precipitation were analyzed by using mean sea level pressure, geopotential height at 700 and 500 hPa and classification of macro scale atmospheric processes of the Northern Hemisphere by Dzerdzeevskii. Summer precipitation was mostly associated with meridional southern group of large scale circulation the Northern Hemisphere, while at synoptic scale it basically fell in cyclonic (49 % of precipitation) and low-gradient cyclonic (30 %) baric fields. Six typical atmospheric circulation patterns over the East Sayan were identified for days with precipitation. The sources and atmospheric moisture transfer to the glacier was defined by using the HYSPLIT trajectory model. The most of summer precipitation (70 %) was related with western cyclones, while about 25 % of rainfalls (mainly of moderate to strong intensity) was originated from the south-east (Pacific monsoon influence).

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Section: Study Area and Methodsmentioning

confidence: 99%

Moisture sources and synoptic conditions of summer precipitation in the glacial zone of the East Sayan Range

Osipov

Осипова

2020

Adv. Sci. Res.

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“…Moreover, glaciers in polar regions play important roles in the functions of local [2] and global ecosystems [3]. Thus, studies on the reaction of glaciers to climate fluctuations [4][5][6] and their impacts on the regional environment are exceptionally important [7].…”

Section: Introductionmentioning

confidence: 99%

Recession and Ice Surface Elevation Changes of Baranowski Glacier and Its Impact on Proglacial Relief (King George Island, West Antarctica)

Sziło

Bialik

2018

Geosciences

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Glacial forefields areas are dynamic landscapes, and due to the glacier frontal position changes, they are sensitive to climatic fluctuations. The results of the analysis of aerial photos, satellite imagery, archival maps, and terrestrial laser scanning surveys are presented. These investigations reveal that the ice surface decreased during the period 1989–2001, when almost the entire current forefield was already uncovered. Moreover, it is shown that, since 1969, there has been a relationship between the changes in air temperature and the changes of the annual front position rate of Baranowski Glacier. Specifically, the results demonstrate that during the cooling observed for the Antarctic Peninsula Regions since 2000, there is a deceleration of the recession rate and ice surface elevation changes of Baranowski Glacier. It is also shown that the fluctuation of the areal extent of the glacier as well as ice surface elevation changes are closely associated with proglacial relief. Moreover, it is shown that the difference in the retreat of the northern and southern tongue of the glacier can be explained by the presence of relatively warm water in the shallow bay, which can enhance the melting process of the northern part. In addition, existence of long flutes and crevasse fill ridges on the analyzed forefield of Baranowski Glacier suggest that the former episodes of its surge, which could happen at least in the northern part of the forefield and middle part of the southern forefield of the glacier.

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Ablation measurement and modeling on the Sygyktinsky Glacier (the Kodar Ridge)

Osipov,

Osipova

2024

Lëd i sneg

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High-resolution data from an automatic weather station (for 45 days in July–August 2021) installed at the level of the perrenial snowline of the Sygyktinsky Glacier (Kodar Ridge, south of the Eastern Siberia) were used to simulate ablation with daily resolution. Ablation was measured conventionally (using snow stakes and ultrasonic sensor) and calculated basing on a surface heat balance (SHB). The average and total values of measured and calculated ablation are in a good agreement with each other, while daily fluctuations in the ablation may differ due to changes in the surface density. It was found that the calculation of ablation based on thermal balance is the most accurate and physically justified. The average magnitude of energy spent on melting the glacier was 81 W/m2. The greatest contribution to melting is made by the radiation balance (70 W/m2, 86%), and especially by the shortwave radiation balance (76 W/m2, 94%). The long-wave radiation balance was slightly negative (–7 W/m2) that means that the glacier was losing heat. The turbulent fluxes of latent and sensible heat were positive on all days, but their total contribution was insignificant (10 W/m2, 13% of the melting energy). The reason for the low values of turbulent heat is the weak wind speeds which are typical for the Kodar region in summer. Significant statistical correlations of ablation with the cloudiness, precipitation, atmospheric pressure, air temperature and relative humidity were found. The relationship of the melting rate with meteorological parameters is controlled mainly by the short-wave radiation balance, and not by the turbulent heat flows. Two the T-index models (regression and “degree-day” ones) were tested using the meteorological data. Both models reproduce the mean and total ablation well (deviation ≤ 9%), but the daily fluctuations in ablation are simulated with significant error (standard error of about 50%). The use of different “degree-day factor” (DDF) coefficients for snow and ice allows improving the model accuracy up to 44%. The T-index models best estimate ablation for snow surface (standard error ≤26%), and they may be improved by taking into account shortwave radiation and weather conditions.

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Glacier Changes on the Pik Topografov Massif, East Sayan Range, Southeast Siberia, from Remote Sensing Data

Cited by 3 publications

References 21 publications

Moisture sources and synoptic conditions of summer precipitation in the glacial zone of the East Sayan Range

Moisture sources and synoptic conditions of summer precipitation in the glacial zone of the East Sayan Range

Recession and Ice Surface Elevation Changes of Baranowski Glacier and Its Impact on Proglacial Relief (King George Island, West Antarctica)

Ablation measurement and modeling on the Sygyktinsky Glacier (the Kodar Ridge)

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