Mountain glaciers of southeast Siberia: current state and changes since the Little Ice Age

Osipov, E. Yu.; Осипова, О. П.

doi:10.3189/2014aog66a135

Cited by 34 publications

(21 citation statements)

References 6 publications

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“…In addition, more compact glaciers with steeper surface slopes shrank less in absolute terms. These findings match those observed in the earlier studies of East Siberia glaciers [16,19,22].…”

Section: Discussionsupporting

confidence: 92%

“…The total area loss of the studied East Sayan glaciers is similar to that obtained in other regions, for example, in the Alps where the overall glacier area reduction from 1850 to 2000 was almost 50% [18]. The data obtained confirm our previous conclusion that the ice area reduction in the region of south East Siberia since the Little Ice Age was among the highest in Eurasia and these glaciers were very sensitive to climate change [16,19]. Probably, the southerly position of the glaciers (e.g., in comparison to north-east Siberia) and their relatively low elevations were among the causes of increased ice loss.…”

Section: Discussionsupporting

confidence: 86%

“…In addition, careful selection of Landsat images with optimal snow conditions during the pre-processing stage also reduces the glacier classification error. Often, the mapping of glaciers with debris-covered tongues may be a real challenge, for example, as it was found for small Kodar glaciers [16]. However, the surface debris cover is not big problem for the East Sayan glaciers which are, in general, almost clean ice/snow bodies.…”

Section: Discussionmentioning

confidence: 99%

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

Osipov

Осипова

2018

Geosciences

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Small mountain glaciers represent the most abundant class in many glaciarized areas around the world; however, less is known about their recent area changes under climatic variability of the last decades. The recent fluctuations of glaciers located in the inner parts of continents are the least studied. In this study we present the results of repeated mapping of seven small (<1.5 km 2 ) glaciers located in a continental setting on the northern slope of the Pik Topografov massif, East Sayan Range, southeast Siberia. The multitemporal glacier inventory was derived from the late summer Landsat TM/ETM+ scenes acquired between 1986 and 2010. Glacier outlines were mapped with thresholded ratio (TM3/TM5) method. Topographic inventory parameters were measured from SRTM DEM. Glacier outlines of the Little Ice Age maximum (LIA,~1850) were reconstructed from terminal moraines widely distributed around the glacier snouts. The results indicate a total ice area decrease from 8.1 km 2 in the LIA to 3.8 km 2 in 2010 (53%, 0.33% year −1 ). We revealed accelerated area shrinkage between 1991 and 2001 (almost two times higher than during the period 1986-2010), while between 2001 and 2010, the ice area did not change significantly. Overall, the glacier changes are consistent with the regional climatic trends (winter precipitation and summer temperature). Local topographic settings significantly impacted the glacier dynamics.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

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

Osipov

Осипова

2018

Geosciences

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“…RGI 4.0 contains 2207 glaciers in this subregion, with a total area of 1803 km 2 (Pfeffer and others, 2014; Table 2). Most studies have found that glaciers retreated during the 20th century in response to higher summer temperatures, with an acceleration of loss in the past three decades (Kadota and Gombo, 2007;Surazakov and others, 2007;Shahgedanova and others, 2010;Zhang and others, 2012;Kamp and others, 2013;Osipov and Osipova, 2014; Table 1). Taken together, these studies have provided a complete glacier inventory for the AM subregion.…”

Section: Previous Researchmentioning

confidence: 99%

A satellite-derived glacier inventory for North Asia

Earl¹,

Gardner²

2015

AoG

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ABSTRACT. This study outlines a consistent methodology for identifying glacier surfaces from Landsat 5, 7 and 8 imagery that is applied to map all mainland North Asian glaciers, providing the first methodologically consistent and complete glacier inventory for the region �2010. We identify 5065 glaciers covering a planimetric area of 2326 � 186 km 2 , most of which is located in the Altai mountain subregion. The total glacier count is 15% higher, but the total glacier area is 32 � 11.6% lower, than the estimated glacier coverage provided in version 4.0 of the Randolph Glacier Inventory. We investigate the distribution of glacier size within North Asia and find that the majority of glaciers (82%) are smaller than 0.5 km 2 but only account for a third of the total glacier area, with the largest 1% (60 glaciers �5 km 2 ) accounting for 28% of the total area. We present hypsometric characterizations of North Asian glaciers, largely substantiating existing findings that glaciers in this region are dominated by cold, relatively dry conditions. We provide a detailed assessment of errors and determine the uncertainty in our area estimate to be �8.0%, with snow-cover uncertainty the largest contributing factor. Based on this assessment, the new glacier inventory presented here is more complete and of higher quality than other currently available data sources.

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“…Our study centres on the Kodar Mountains, the highest massif in the region, which currently hosts over 30 small cirque glaciers (Preobrazhenskiy, 1960;Shahgedanova et al, 2003Shahgedanova et al, , 2011Stokes et al, 2013;Osipov and Osipova, 2014). We collected samples for exposure dating from boulders on moraine complexes in the Chara Depression and in the River Vitim valley (Table 1 .…”

Section: Field Sitesmentioning

confidence: 99%

Extensive glaciation in Transbaikalia, Siberia, at the Last Glacial Maximum

Margold

Jansen

Gurinov

et al. 2016

Quaternary Science Reviews

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Successively smaller glacial extents have been proposed for continental Eurasia during the stadials of the last glacial period leading up to the Last Glacial Maximum (LGM). At the same time the large mountainous region east of Lake Baikal, Transbaikalia, has remained unexplored in terms of glacial chronology despite clear geomorphological evidence of substantial past glaciations. We have applied cosmogenic 10Be exposure dating and optically stimulated luminescence to establish the first quantitative glacial chronology for this region. Based on eighteen exposure ages from five moraine complexes, we propose that large mountain ice fields existed in the Kodar and Udokan mountains during Oxygen Isotope Stage 2, commensurate with the global LGM. These ice fields fed valley glaciers (>100 km in length) reaching down to the Chara Depression between the Kodar and Udokan mountains and to the valley of the Vitim River northwest of the Kodar Mountains. Two of the investigated moraines date to the Late Glacial, but indications of incomplete exposure among some of the sampled boulders obscure the specific details of the post-LGM glacial history. In addition to the LGM ice fields in the highest mountains of Transbaikalia, we report geomorphological evidence of a much more extensive, ice-cap type glaciation at a time that is yet to be firmly resolved. geomorphological evidence of a much more extensive, ice-cap type glaciation at a time that is yet to be firmly resolved. KeywordsGlaciation, Transbaikalia, Last Glacial Maximum, Cosmogenic 1 * * * * * * * * 10Be exposure dating, Optically stimulated luminescence. Highlights-Eighteen 10Be exposure ages on moraines in high mountains of Transbaikalia, Siberia.-Large ice fields existed in the mountains of Transbaikalia at the global LGM.-Lower mountain ranges of Transbaikalia were also heavily glaciated at the LGM.-Evidence exists for an extensive ice cap, the timing of which is yet to be resolved.

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Mountain glaciers of southeast Siberia: current state and changes since the Little Ice Age

Cited by 34 publications

References 6 publications

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

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

A satellite-derived glacier inventory for North Asia

Extensive glaciation in Transbaikalia, Siberia, at the Last Glacial Maximum

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