DOI: 10.5194/tc-15-1845-2021
论文题名: Spatially and temporally resolved ice loss in High Mountain Asia and the Gulf of Alaska observed by CryoSat-2 swath altimetry between 2010 and 2019
作者: Jakob L. ; Gourmelen N. ; Ewart M. ; Plummer S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 4 起始页码: 1845
结束页码: 1862
语种: 英语
英文关键词: altimetry
; CryoSat
; glacier
; glacier mass balance
; Pacific Decadal Oscillation
; radar altimetry
; satellite altimetry
; sea level change
; spatiotemporal analysis
; Gulf of Alaska
; Karakoram
; Pacific Ocean
英文摘要: Glaciers are currently the largest contributor to sea level rise after ocean thermal expansion, contributing 30% to the sea level budget. Global monitoring of these regions remains a challenging task since global estimates rely on a variety of observations and models to achieve the required spatial and temporal coverage, and significant differences remain between current estimates. Here we report the first application of a novel approach to retrieve spatially resolved elevation and mass change from radar altimetry over entire mountain glaciers areas. We apply interferometric swath altimetry to CryoSat-2 data acquired between 2010 and 2019 over High Mountain Asia (HMA) and in the Gulf of Alaska (GoA). In addition, we exploit CryoSat s monthly temporal repeat to reveal seasonal and multiannual variation in rates of glaciers thinning at unprecedented spatial detail.We find that during this period, HMA and GoA have lost an average of-28:0-3.0 Gt yr-1 (-0:29-0.03mw.e. yr-1) and-76:3-5.7 Gt yr-1 (-0:89-0.07mw.e. yr-1), respectively, corresponding to a contribution to sea level rise of 0.078-0.008mmyr-1 (0.051-0.006mmyr-1 from exorheic basins) and 0.211-0.016mmyr-1. The cumulative loss during the 9-year period is equivalent to 4.2% and 4.3% of the ice volume, respectively, for HMA and GoA. Glacier thinning is ubiquitous except for in the Karakoram Kunlun region, which experiences stable or slightly positive mass balance. In the GoA region, the intensity of thinning varies spatially and temporally, with acceleration of mass loss from-0:06-0.33 to-1:1-0.06myr-1 from 2013, which correlates with the strength of the Pacific Decadal Oscillation. In HMA ice loss is sustained until 2015 2016, with a slight decrease in mass loss from 2016, with some evidence of mass gain locally from 2016 2017 onwards. © 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/164715
Appears in Collections: 气候变化与战略
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作者单位: Earthwave Ltd, Edinburgh, EH9 3HJ, United Kingdom; School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, United Kingdom; IPGS UMR 7516, Université de Strasbourg, Strasbourg, 67000, France; European Space Agency, ESA-ESTEC, Noordwijk2201, Netherlands
Recommended Citation:
Jakob L.,Gourmelen N.,Ewart M.,et al. Spatially and temporally resolved ice loss in High Mountain Asia and the Gulf of Alaska observed by CryoSat-2 swath altimetry between 2010 and 2019[J]. Cryosphere,2021-01-01,15(4)