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IV: Ice velocity – costal regions + select areas (phase 1), all ice sheet (ph. 2) SEC: Surface elevation changes, ERS/Envisat/CryoSat, 1991-2014 GLL: Grounding.

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Presentation on theme: "IV: Ice velocity – costal regions + select areas (phase 1), all ice sheet (ph. 2) SEC: Surface elevation changes, ERS/Envisat/CryoSat, 1991-2014 GLL: Grounding."— Presentation transcript:

1 IV: Ice velocity – costal regions + select areas (phase 1), all ice sheet (ph. 2) SEC: Surface elevation changes, ERS/Envisat/CryoSat, GLL: Grounding lines from SAR, main northern floating glaciers 1991-present CFL: Calving front locations main outlet glaciers 1991-present SECIVGLLCFL* GCOS requirements - Horizontal resolution 100 m1 km m - Temporal resolution30 days 1 yr35 days - Accuracy0.1 m/yr10 m/yr1 km m CCI implementation - Horizontal resolution5 km500 m200 m - Temporal resolution1 yr1 yr (S1)5 yr1 yr - Accuracy0.1 m/yr20 m/yr1 km200 m (Greenland) Ice Sheets CCI

2 Coverage areas for IV / SAR interferometry: Phase 1: Coastal regions, northern basin, Time series W coast glaciers Phase 2: All ice sheet covered multiple times – Sentinel-1A/B Periods covered

3 ECV improvements (SEC) SEC from ERS and Envisat (Khvorostovsky, NERSC) SEC from Envisat CCI solution

4 ECV improvements (IV) CCI coastal coverage 1995/96 NE Greenland ice stream zoom-in

5 Time series: CFL Jakobshavn glacier CFL (EnviSat ASAR-summer) Time series SAR imagery (Sermeq Avannarleq)

6 Uncertainties: SEC and IV SEC uncertainty (scale m/yr) IV velocities (left) and uncertainty (right), m/yr ALOS/PALSAR, NE Greenland, with GPS sites

7 Validation: SEC and IV Validation of SEC: NASA IceBridge and ESA CryoVEx repeat flights DTU CryoVEx / Promice NASA Parca / IceBridge Validation of IV: GPS on glaciers

8 Overall changes of the ice sheet 2003 Envisat (CCI) ICESAT (DTU)

9 Mass balance of the ice sheet GRACE (DTU Masscons) Envisat (CCI) and GRACE merged solution Overall mass loss (excl Canadian ice caps) ~ 230 GT/yr ~ 0.7 mm global sea level rise

10 Trends in Greenland ice sheet 5-year running means of Envisat (ECV time series) m/yr A: accelerating loss D: decelerating D A A

11 Glacier changes: CFL movie

12 CCI auxillary data Improved DEM of Greenland from digital mapping, ASTER, ERS/ICESat and CryoSat Reference for SEC and IV.. resolution 200 m-1 km, polar stereographic or UTM Land/ice masks … including outlying glaciers and ice caps … new CCI 500 m mask

13 Ice Sheets CCI status First prototype products Sep 2013 … ECV production ongoing: - Envisat altimetry, await REAPER reprocessing for ERS-1 and ERS-2 - IV processing: await new Radarsat 2013 data - ECV processing complete June 2014 Data web site: New CCI project add-ons 2013: - SAR software readiness for Sentinel-1 - CryoSat-2 use (fill-in between EnviSat and Sentinel-3) - Preparation for Antarctica CCI Selected papers: - Ticconi, Levinsen, Khvorostovsky, Forsberg, Shepherd. "Results of Ice_Sheets_cci Round Robin Activity Surface Elevation Changes“ IGARSS proceedings. Melbourne, July Forsberg, R et al: Mass loss of Greenland from GRACE, IceSat and Cryosat. CryoSat workshop proceedings, ESA SP-717, Dresden, Levinsen et al: ESA Ice Sheets CCI: inter-comparison of surface elevation changes from laser and radar altimetry over Jakobshavn Isbræ, Greenland. The Cryosphere, 8, 1-13, Sørensen et al: Greenland change from Envisat, JGR, to be submitted, 2014.

14 SE-Greenland calving front, Køge Bugt Phase-1 achievements: First European SAR mapping of ice velocity at margins / basins Demonstrated the potential of Envisat for height change mapping Time series of calving fronts – 20+ major outlet glaciers Phase-2 developments: Seamless SEC (ERS, Envisat, CS-2, Sentinel-3) 2x icesheet-wide velocity mapping, Sentinel-1, Time series of velocity 1991-present on 7 main glaciers GRACE-derived mass balance as new ECV Antarctica Ice Sheet CCI project - Close coordination with Greenland CCI (joint CRG, joint GRACE RR)

15 – cooperation DMI, GEUS, DTU-Space Daily surface mass balance GRACE visualization

16 Antarctic ice sheet CCI Start 2015 – Phase II directly (build on Ice_Sheets_CCI – UK lead): - Altimetry elevation changes 1991-present (ERS, Envisat, CryoSat) - Ice velocities from SAR – common software and cloud computing - GRACE mass balance - Grounding Line Locations on major icestreams and ice shelves

17 Thanks for your attention Jotulstraumen, East Antarctica, DTU 2012


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