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| DOI | 10.5194/tc-14-585-2020 |
| Supra-glacial debris cover changes in the Greater Caucasus from 1986 to 2014 | |
| Tielidze L.G.; Bolch T.; Wheate R.D.; Kutuzov S.S.; Lavrentiev I.I.; Zemp M. | |
| 发表日期 | 2020 |
| ISSN | 19940416 |
| EISSN | 14 |
| 起始页码 | 585 |
| 结束页码 | 598 |
| 卷号 | 14期号:2 |
| 英文摘要 | Knowledge of supra-glacial debris cover and its changes remain incomplete in the Greater Caucasus, in spite of recent glacier studies. Here we present data of supraglacial debris cover for 659 glaciers across the Greater Caucasus based on Landsat and SPOT images from the years 1986, 2000 and 2014. We combined semi-automated methods for mapping the clean ice with manual digitization of debris-covered glacier parts and calculated supraglacial debris-covered area as the residual between these two maps. The accuracy of the results was assessed by using high-resolution Google Earth imagery and GPS data for selected glaciers. From 1986 to 2014, the total glacier area decreased from 691:5±29:0 to 590:0±25:8 km2 (15:8± 4:1 %, or ± 0:52%yr-1), while the clean-ice area reduced from 643:2±25:9 to 511:0±20:9 km2 (20:1±4:0 %, or ± 0:73%yr-1). In contrast supra-glacial debris cover increased from 7:0±6:4 %, or 48:3±3:1 km2, in 1986 to 13:4±6:2% (± 0:22%yr-1), or 79:0±4:9 km2, in 2014. Debris-free glaciers exhibited higher area and length reductions than debris-covered glaciers. The distribution of the supra-glacial debris cover differs between the northern and southern and between the western, central and eastern Greater Caucasus. The observed increase in supra-glacial debris cover is significantly stronger on the northern slopes. Overall, we have observed up-glacier average migration of supra-glacial debris cover from about 3015 to 3130ma.s.l. (metres above sea level) during the investigated period. © Author(s) 2020. |
| 学科领域 | debris flow; digital mapping; digitization; glacial debris; glacier dynamics; GPS; image analysis; Landsat; satellite imagery; SPOT; Caucasus |
| 语种 | 英语 |
| scopus关键词 | debris flow; digital mapping; digitization; glacial debris; glacier dynamics; GPS; image analysis; Landsat; satellite imagery; SPOT; Caucasus |
| 来源期刊 | The Cryosphere
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/118756 |
| 作者单位 | Department of Geomorphology, Vakhushti Bagrationi Institute of Geography, Ivane Javakhishvili Tbilisi State University, 6 Tamarashvili st., Tbilisi, 0177, Georgia; Antarctic Research Centre, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, 6140, New Zealand; School of Geography and Sustainable Development, University of St.Andrews, North Street, Irvine Building, St.Andrews, KY16 9AL, United Kingdom; Natural Resources and Environmental Studies, University of Northern British Columbia, 3333 University Way, Prince George, BC V2N 4Z9, Canada; Department of Glaciology, Institute of Geography, Russian Academy of Sciences, 29 Staromonetniy Pereulok, Moscow, 119017, Russian Federation; Faculty of Geography and Geoinformation Technologies, National Research University Higher School of Economics, Myasnitskaya Ulitsa, 20, Moscow, 101000, Russian Federation; Department of G... |
| 推荐引用方式 GB/T 7714 | Tielidze L.G.,Bolch T.,Wheate R.D.,et al. Supra-glacial debris cover changes in the Greater Caucasus from 1986 to 2014[J],2020,14(2). |
| APA | Tielidze L.G.,Bolch T.,Wheate R.D.,Kutuzov S.S.,Lavrentiev I.I.,&Zemp M..(2020).Supra-glacial debris cover changes in the Greater Caucasus from 1986 to 2014.The Cryosphere,14(2). |
| MLA | Tielidze L.G.,et al."Supra-glacial debris cover changes in the Greater Caucasus from 1986 to 2014".The Cryosphere 14.2(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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