Greenland Ice Sheets CCI

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Presentation transcript:

Greenland Ice Sheets CCI IV: Ice velocity – costal regions + select areas (phase 1), all ice sheet (ph. 2) SEC: Surface elevation changes, ERS/Envisat/CryoSat, 1991-present GLL: Grounding lines from SAR, main northern floating glaciers 1991-present CFL: Calving front locations - 20+ main outlet glaciers 1991-present GMB: Gravimetric mass balance from GRACE - new ECV grid/line data SEC IV GLL CFL GMB - Horizontal resolution 5 km 500 m 200 m 50 km - Temporal resolution 1 yr 1 yr (S1) 5 yr 1 month Accuracy 0.1 m/yr 20 m/yr 1 km 20 GT Jakobshavn Glacier front

Velocity [m/d] Greenland-wide IV coverage (Enveo) ECV release Dec 2015 Sentinel 1 IWS SLC Period: Nov 2014-Dec 2015 (mainly winter scenes) Arrangements agreed with ESA for several yearly data acquisitions => Time series of frequent epochs possible (but processing intensive!)

Google earth data IV SEC

SEC – 5 year running means

Grid filtering – merged product 15 km/5 cm 0.1 filter Grid errors

Envisat 2006-10 Details (10 km filtering)

CryoSat CCI 2010-14

CryoSat 2010-14 dh/dt - details zoom in 79 Glacier Zachariae Storstrømmen Method: Custom treshold Level-1 retracking of SARin and SAR mode data (J. Nilsson) 5 km resolution stacking w.r.t. reference DEM (iterative) [m/yr]

GMB issues: Greenland vs Canada Greenland mass trend 2002-15: -244 GT/yr (excl. Canada) Solving for Greenland mask alone: ~ -300 GT/yr … too large Absolute trend values of Greenland depends strongly on whether East Canadian ice caps are included or not .. express leakage problems Mass loss of Greenland increased by ~100 G/yr around 2010 … (2012 extreme melt event) Canadian Ice Caps: Units: GT/yr North (Ellesmere/Devon) South (Baffin Island) IceSat 2003-9 (Nilsson et al, 2013; M1) -27.1±6.2 -22.0 ±6.2 CryoSat 2010-14 -20.3 -18.2 GRACE 2002-14 -32.2 -31.8

GRACE issues: Validation with SEC? GRACE 2003-12 (DTU Masscons) Envisat (CCI) and GRACE merged solution Overall mass loss (excl Canadian ice caps) ~ 250 GT/yr ~ 0.7 mm global sea level rise

Ice Sheet CCI users ... Coupled ice sheet / climate models (e.g. DMI, European/US groups) Validation of Surface Mass Balance and ice flow models – glaciologists General public, stakeholders: - Ice Sheet changes major indicator of climate change / global sea level rise Monitoring programs (PROMICE) Scientists … easier access to data CCI ECV Status Feb 9, 2016:. CFL: 45 downloads, GLL: 43 downloads, IV: 147 downloads (5 products) SEC: 60 downloads

Phase 2 / Year 1 ECV’s + Options GMB: - Monthly values mass loss, 2002-present Zwally basin time series, total mass loss, Maps (50 km resolution) .. Greenland only IV: 2nd Greenland-wide S-1 grid, 2012-13 RadarSat grid 7 ice streams Optical fill-in SEC: Continue yearly dh/dt: CryoSat, AltiKa New product: accumulate surface elevation change 1992-present, ERS, EnviSat, CryoSat .. Issues: Antarctica methodology correspondence (Antarctica CCI) Quantifying outlying Greenland glaciers (Glaciers CCI) CFL, GLL: Continue time series, S-1+ S-2 data utilization CCI Options proposed: Sea level closure (SL CCI, AIS CCI, GIS CCI, Glaciers CCI) … in prep. High-resolution GMB product (GIS-CCI), combination of GRACE, altimetry, firn models