The Cryosphere, 15, 1845–1862, 2021 https://doi.org/10.5194/tc-15-1845-2021 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. 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 Livia Jakob1, Noel Gourmelen1,2,3, Martin Ewart1, and Stephen Plummer4 1Earthwave Ltd, Edinburgh, EH9 3HJ, UK 2School of GeoSciences, University of Edinburgh, Edinburgh, EH8 9XP, UK 3IPGS UMR 7516, Université de Strasbourg, CNRS, Strasbourg, 67000, France 4European Space Agency, ESA-ESTEC, Noordwijk, 2201 AZ, the Netherlands Correspondence: Livia Jakob (
[email protected]) Received: 25 June 2020 – Discussion started: 27 July 2020 Revised: 23 February 2021 – Accepted: 26 February 2021 – Published: 14 April 2021 Abstract. Glaciers are currently the largest contributor to sea HMA ice loss is sustained until 2015–2016, with a slight de- level rise after ocean thermal expansion, contributing ∼ 30 % crease in mass loss from 2016, with some evidence of mass to the sea level budget. Global monitoring of these regions gain locally from 2016–2017 onwards. 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 re- main between current estimates. Here we report the first ap- 1 Introduction plication of a novel approach to retrieve spatially resolved elevation and mass change from radar altimetry over entire Glaciers store less than 1 % of the mass (Farinotti et al., 2019) mountain glaciers areas. We apply interferometric swath al- and occupy just over 4 % of the area (RGI Consortium, 2017) timetry to CryoSat-2 data acquired between 2010 and 2019 of global land ice; however their rapid rate of mass loss has over High Mountain Asia (HMA) and in the Gulf of Alaska accounted for almost a third of the global sea level rise dur- (GoA).