1. 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 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

2. 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!)

3. Google earth data IV
SEC

4. SEC – 5 year running means

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

6. Envisat
Details
(10 km
filtering)

7. CryoSat
CCI

8. 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]

9. GMB issues: Greenland vs Canada
Greenland mass trend :
-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
(Nilsson et al, 2013; M1)
-27.1±6.2
-22.0 ±6.2
CryoSat
-20.3
-18.2
GRACE
-32.2
-31.8

10. GRACE issues: Validation with SEC?
GRACE (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

11. 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

12. 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, 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