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DOI | 10.5194/tc-15-595-2021 |
Distributed summer air temperatures across mountain glaciers in the south-east Tibetan Plateau: temperature sensitivity and comparison with existing glacier datasets | |
Shaw, Thomas E.; Yang, Wei; Ayala, Alvaro; Bravo, Claudio; Zhao, Chuanxi; Pellicciotti, Francesca | |
通讯作者 | Shaw, TE (通讯作者) |
发表日期 | 2021 |
ISSN | 1994-0416 |
EISSN | 1994-0424 |
起始页码 | 595 |
结束页码 | 614 |
卷号 | 15期号:2 |
英文摘要 | Near-surface air temperature (T-a) is highly important for modelling glacier ablation, though its spatiotemporal variability over melting glaciers still remains largely unknown. We present a new dataset of distributed T-a for three glaciers of different size in the south-east Tibetan Plateau during two monsoon-dominated summer seasons. We compare on-glacier T-a to ambient T-a extrapolated from several local off-glacier stations. We parameterise the along-flowline sensitivity of T-a on these glaciers to changes in off-glacier temperatures (referred to as temperature sensitivity) and present the results in the context of available distributed on-glacier datasets around the world. Temperature sensitivity decreases rapidly up to 2000-3000 m along the down-glacier flowline distance. Beyond this distance, both the T-a on the Tibetan glaciers and global glacier datasets show little additional cooling relative to the off-glacier temperature. In general, T-a on small glaciers (with flowline distances < 1000 m) is highly sensitive to temperature changes outside the glacier boundary layer. The climatology of a given region can influence the general magnitude of this temperature sensitivity, though no strong relationships are found between along-flowline temperature sensitivity and mean summer temperatures or precipitation. The terminus of some glaciers is affected by other warm-air processes that increase temperature sensitivity (such as divergent boundary layer flow, warm up-valley winds or debris/valley heating effects) which are evident only beyond similar to 70 % of the total glacier flowline distance. Our results therefore suggest a strong role of local effects in modulating temperature sensitivity close to the glacier terminus, although further work is still required to explain the variability of these effects for different glaciers. |
关键词 | SURFACE-ENERGY BALANCEMASS-BALANCEMIDLATITUDE GLACIERMELT MODELSVARIABILITYABLATIONSIMULATIONSIMPACTANDESHEAT |
语种 | 英语 |
WOS研究方向 | Physical Geography ; Geology |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS记录号 | WOS:000618706600001 |
来源期刊 | CRYOSPHERE |
来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260421 |
推荐引用方式 GB/T 7714 | Shaw, Thomas E.,Yang, Wei,Ayala, Alvaro,et al. Distributed summer air temperatures across mountain glaciers in the south-east Tibetan Plateau: temperature sensitivity and comparison with existing glacier datasets[J]. 中国科学院青藏高原研究所,2021,15(2). |
APA | Shaw, Thomas E.,Yang, Wei,Ayala, Alvaro,Bravo, Claudio,Zhao, Chuanxi,&Pellicciotti, Francesca.(2021).Distributed summer air temperatures across mountain glaciers in the south-east Tibetan Plateau: temperature sensitivity and comparison with existing glacier datasets.CRYOSPHERE,15(2). |
MLA | Shaw, Thomas E.,et al."Distributed summer air temperatures across mountain glaciers in the south-east Tibetan Plateau: temperature sensitivity and comparison with existing glacier datasets".CRYOSPHERE 15.2(2021). |
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