DOI: 10.5194/tc-15-1259-2021
论文题名: Geodetic point surface mass balances: A new approach to determine point surface mass balances on glaciers from remote sensing measurements
作者: 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.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 3 起始页码: 1259
结束页码: 1276
语种: 英语
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164825
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Cryosphere,2021-01-01,15(3)