EGU, CL4.7 Sea Level Rise, Vienna, AT, 8 April 2019

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Presentation transcript:

EGU, CL4.7 Sea Level Rise, Vienna, AT, 8 April 2019 Global glacier mass changes and their contributions to sea-level rise from 1961 to 2016 Zemp, M., Huss, M., Thibert, E., Eckert, N., McNabb, R., Huber, J., Barandun, M., Machguth, H., Nussbaumer, S.U., Gärtner-Roer, I., Thomson, L., Paul, F., Maussion, F., Kutuzov, S., and Cogley, J.G. Glaciers online: www.swisseduc.ch/glaciers

intro data methods results take home Glaciers distinct from the Greenland & Antarctic Ice Sheets 215,000 glaciers · 158,000 km3 · 0.32 m potential SLE Farinotti et al. (2019), Nature Geoscience www.swisseduc.ch/glaciers/

intro data methods results take home glacier sample ~ 500 The Alps Kääb et al. (2013) Photo: M. Zemp

intro data methods results take home TanDEM-X, DLR Pleiades, CNES Airbus Cryosat-2, ESA Graphic: P. Joerg

intro data methods results take home New glacier change assessment Consolidate glaciological sample Boost geodetic sample New method to combine glaciol. and geodetic results Temporal variability from glaciol. sample Calibration to geodetic values Extrapolation to full sample Uncertainty assessment Expert workshop Ibergeregg, CH 14-17 March 2018 Publication for upcoming IPCC reports: SROCC

mzemp ¦ wgms ¦ research ¦ outlook ¦ teaching ¦ summary Worldwide glacier datasets Thanks to all glaciologists for sharing their data with the community through the WGMS! Zemp et al. (2019)

intro data methods results take home Boost the geodetic sample km2 m a.s.l. km2 observational samples: glaciological from 450 glaciers geodetic from 19,130 glaciers Zemp et al. (2019)

intro data methods results take home Extraction of temporal variability from glaciol. sample building on Lliboutry’s linear model J. Glaciol. 1974 Zemp et al. (2019)

intro data methods results take home Calibration to glacier-specific geodetic series g(t)+z(t) Zemp et al. (2019)

intro data methods results take home Cumulative glacier mass changes 1961-2016 Glacier mass loss / Area.ch = 9625 x 10^9 t (or: m^3 w.e.) / 41285 x 10^6 m^2 = 233 m w.e. or 250 m ice cover over Switzerland (125 m ice cover over Austria, 83879 km^2; 30 m ice cover over Germany, 357386km^2) Zemp et al. (2019)

intro data methods results take home Cumulative glacier mass changes 1961-2016 Zemp et al. (2019)

intro data methods results take home Glacier mass changes rates from 2006-16 Southern Andes Alaska Zemp et al. (2019) Southern Andes Alaska

intro data methods results take home Annual glacier contributions to sea-level rise 1961-2016 Global ΔM 2011-16: -335 Gt yr-1 about 1 mm SLE yr-1 (3 x remaining ice of the Alps) Zemp et al. (2019)

intro data methods results take home Main contributions to sea-level budget 2004-2015 Antarctic Ice Sheet residuals Greenland Ice Sheet thermal expansion glaciers Glacier data from Zemp et al. (2019), other values from Cazenave et al. (2018), observed GMSLR: 3.5 mm per year

intro data methods results take home Current glacier contributions to global sea-level rise: about 1 mm SLE per year (3x remaining ice of the Alps) ¼ of GMSLR Today 17:00 in Nature michael.zemp@geo.uzh.ch