气候变化领域集成服务门户(CCPortal): Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements

CCPortal

DOI	10.5194/tc-15-1259-2021
	Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements
	Vincent C.; Cusicanqui D.; Jourdain B.; Laarman O.; Six D.; Gilbert A.; Walpersdorf A.; Rabatel A.; Piard L.; Gimbert F.; Gagliardini O.; Peyaud V.; Arnaud L.; Thibert E.; Brun F.; Nanni U.
发表日期	2021
ISSN	19940416
起始页码	1259
结束页码	1276
卷号	15 期号:3
英文摘要	Mass balance observations are very useful to assess climate change in different regions of the world. As opposed to glacier-wide mass balances which are influenced by the dynamic response of each glacier, point mass balances provide a direct climatic signal that depends on surface accumulation and ablation only. Unfortunately, major efforts are required to conduct in situ measurements on glaciers. Here, we propose a new approach that determines point surface mass balances from remote sensing observations. We call this balance the geodetic point surface mass balance. From observations and modelling performed on the Argentière and Mer de Glace glaciers over the last decade, we show that the vertical ice flow velocity changes are small in areas of low bedrock slope. Therefore, assuming constant vertical velocities in time for such areas and provided that the vertical velocities have been measured for at least 1 year in the past, our method can be used to reconstruct annual point surface mass balances from surface elevations and horizontal velocities alone. We demonstrate that the annual point surface mass balances can be reconstructed with an accuracy of about 0.3 m of water equivalent per year (m w.e. a-1) using the vertical velocities observed over the previous years and data from unmanned aerial vehicle images. Given the recent improvements of satellite sensors, it should be possible to apply this method to high-spatial-resolution satellite images as well. © 2021 Copernicus GmbH. All rights reserved.
英文关键词	bedrock; climate change; climate signal; dynamic response; flow velocity; geodesy; glacier dynamics; ice flow; mass balance; remote sensing; satellite imagery; satellite sensor; Auvergne-Rhone-Alpes; France; Haute Savoie; Mer de Glace
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202447
作者单位	Université Grenoble Alpes, CNRS, Ird, Grenoble INP, Ige, Grenoble, 38000, France; Université Grenoble Alpes, Cnrs, ISTerre, Grenoble, France; Université Grenoble Alpes, Inrae, Ur Etgr, Grenoble, France; Université Savoie Mont Blanc, Cnrs, Laboratoire EDyTEM, Chambery, 73000, France
推荐引用方式 GB/T 7714	Vincent C.,Cusicanqui D.,Jourdain B.,et al. Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements[J],2021,15(3).
APA	Vincent C..,Cusicanqui D..,Jourdain B..,Laarman O..,Six D..,...&Nanni U..(2021).Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements.Cryosphere,15(3).
MLA	Vincent C.,et al."Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements".Cryosphere 15.3(2021).