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Seasonal variations in glacier velocity in the High Mountain Asia region during 2015–2020

Journal of Arid Land 2023年第6期15卷 637-648页

作者： ZHANG Zhen XU Yangyang LIU Shiyin DING Jing ZHAO Jinbiao School of Geomatics Anhui University of Science and TechnologyHuainan 232001China Institute of International Rivers and Eco-Security Yunnan UniversityKunming 650091China

velocity is an important component of glacier dynamics and directly reflects the response of glaciers to climate *** a result,an accurate determination of seasonal variation in glacier velocity is very important in understanding the annual variation in glacier ***,few studies of glacier velocity in the High Mountain Asia(HMA)region were *** these lines,in this work,based on Sentinel-1 glacier velocity data,the distribution of glacier velocity in the HMA region was plotted and their seasonal variations during 2015-2020 were systematically *** average glacier velocity in the HMA region was 0.053 m/d,and was positively correlated with the glacier area and *** in the Karakoram Mountains had the fastest average flow velocity(0.060 m/d),where the glaciers exhibited the largest average area and average ***,glaciers in the GangdisêMountains had the slowest velocity(0.022 m/d)and the smallest average glacier *** glacier flows were the fastest in spring(0.058 m/d),followed by summer(0.050 m/d),autumn(0.041 m/d),and winter(0.040 m/d).In addition,the glacier flows were the maximum in May,being 1.4 times of the annual average *** some areas,such as the Qilian,Altun,Tibetan Interior,Eastern Kunlun,and Western Kunlun mountains,the peak glacier velocities appeared in June and *** glacier velocity in the HMA region decreased in midsummer and reached the minimum in December when it was 75%of the annual *** results highlight the role of meltwater in the seasonal variation in glacier flows in late spring and early *** seasonal velocity variation of lake-terminating glaciers was similar to that of land-terminating ones,but the former flowed *** velocity difference close to the mass balance line between the lake-and land-terminating glaciers was obviously greater in spring than in other *** summer,the difference between the lake-and land-terminating glaciers at a normalized distance

关键词： glacier velocity spatial-temporal variations High Mountain Asia synthetic aperture radar offset-tracking climate change

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Comprehensive analysis of glacier recession(2000-2020)in the Nun-Kun Group of glaciers,Northwestern Himalaya

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Journal of Mountain Science 2024年第3期21卷 768-785页

作者： Shakil Ahmad ROMSHOO Ummer AMEEN Mustafa Hameed BHAT Tariq ABDULLAH Department of Geoinformatics University of KashmirSrinagarKashmir 190006India Islamic University of Science and Technology AwantiporaKashmir 192122India Centre of Excellence for glacier Studies in the Western Himalaya University of KashmirSrinagarKashmir 190006India

Himalayan glaciers are shrinking rapidly,especially after *** shrinkage,however,shows a differential pattern in space and time,emphasizing the need to monitor and assess glacier changes at a larger *** this study,changes of 48 glaciers situated around the twin peaks of the Nun and Kun mountains in the northwestern Himalaya,hereafter referred to as Nun-Kun Group of glaciers(NKGG),were investigated using Landsat satellite data during *** in glacier area,snout position,Equilibrium Line Altitude(ELA),surface thickness and glacier velocity were assessed using remote sensing data supplemented by field *** study revealed that the NKGG glaciers have experienced a recession of 4.5%±3.4%and their snouts have retreated at the rate of 6.4±1.6 m·a^(-1).Additionally,there was a 41%increase observed in the debris cover area during the observation *** the geodetic approach,an average glacier elevation change of-1.4±0.4 m·a^(-1)was observed between 2000 and *** observed mass loss of the NKGG has resulted in the deceleration of glacier velocity from 27.0±3.7 m·a^(-1)in 2000 to 21.2±2.2 m·a^(-1)in *** ELA has shifted upwards by 83.0±22 m during the *** morphological and topographic factors showed a strong influence on glacier ***,a higher recession of 12.9%±3.2%was observed in small glaciers,compared to 2.7%±3.1%in larger *** debris-covered glaciers showed lower shrinkage(2.8%±1.1%)compared to the clean glaciers(9.3%±5%).The glacier depletion recorded in the NKGG during the last two decades,if continued,would severely diminish glacial volume and capacity to store water,thus jeopardizing the sustainability of water resources in the basin.

关键词： Nun-Kun range glacier recession glacier snout Remote Sensing Himalaya glacier velocity

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The presence and influence of glacier surging around the Geladandong ice caps,North East Tibetan Plateau

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Advances in Climate Change Research 2021年第3期12卷 299-312页

作者： Owen KING Atanu BHATTACHARYA Tobias BOLCH Department of Geography and Sustainable Development University of St AndrewsSt AndrewsKY169ALUK Department of Remote Sensing and GIS JIS UniversityKolkata700109India

Many glaciers and ice caps on the Tibetan Plateau have retreated and lost mass in recent years in response to temperature increases,providing clear evidence of the impact of climate change on the *** is increasing evidence that many of the glaciers on the Tibetan Plateau have also shown periodically dynamic behaviour in the form of glacier surging and some even catastrophic collapse *** this study,we examine the prevalence of glacier surging at the Geladandong ice caps,North East Tibetan Plateau,to better understand the role of surge events in the evolution of glacier mass loss *** glacier surface elevation change data over the period 1969—2018 and glacier surface velocity data from the ITS_LIVE dataset,we find that 19 outlet glaciers of the ice caps are of *** multi-temporal measurements of glacier mass balance show that surge-type glacier mass budgets vary depending on the portion of the surge-cycle captured by geodetic *** the regional level,pre-and post-surge glacier mass loss variability does not bias regional mass budget estimates,but enhanced,or suppressed,mass loss estimates are likely when small groups of glaciers are *** results emphasise the importance of accurate surge-type glacier inventories and the need to maximise geodetic data coverage over glacierised regions known to contain surge-type glaciers.

关键词： glacier surge Remote sensing Corona KH-4 glacier mass balance ASTER Tibetan Plateau glacier velocity

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