气候变化领域集成服务门户(CCPortal): 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

CCPortal

DOI	10.5194/tc-15-1845-2021
	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
	Jakob L.; Gourmelen N.; Ewart M.; Plummer S.
发表日期	2021
ISSN	19940416
起始页码	1845
结束页码	1862
卷号	15 期号:4
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.
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
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/202337
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
推荐引用方式 GB/T 7714	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],2021,15(4).
APA	Jakob L.,Gourmelen N.,Ewart M.,&Plummer S..(2021).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.Cryosphere,15(4).
MLA	Jakob L.,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".Cryosphere 15.4(2021).