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Sea ice thickness from CryoSat – A new data set for operational ice services? Christian Haas German CryoSat Office AWI.

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Presentation on theme: "Sea ice thickness from CryoSat – A new data set for operational ice services? Christian Haas German CryoSat Office AWI."— Presentation transcript:

1 Sea ice thickness from CryoSat – A new data set for operational ice services? Christian Haas German CryoSat Office AWI

2 Goals: 1.Observe changes in Arctic multi-year ice thickness 2.Observe changes of Antarctic and Greenland ice sheet thickness First Earth Opportunity Mission, to be launched in November 2004 Radar altimetry mission with new technology: Synthetic Aperture, Interferometric Radar Altimeter: SIRAL Selected after 1999 proposal from European Scientists Group, lead by Prof. D. Wingham, University Collage London, UK

3 h? Sea Ice Ice Sheets

4 Estimate Freeboard above Interpolated Ocean surface Conversion assumes reflection from the ice/snow interface Conversion to thickness using climatology of snow depth/densities [Warren, 1999] Freeboard to Thickness Conversion

5 Observed thickness trends (ERS-2) (Laxon et al., 2003) Comparison of satellite and submarine thickness measurements ‘93 to ‘97

6 Pulse-Limited Radar Altimetry Time = 2*h/v h

7 Ocean Ice Sheets Sea Ice

8 SIRAL: Synthetic-Aperture Interferometric Radar Altimeter SAR InSAR 250 m along track resolution

9 SAR / InSAR / LBR Modes

10 Orbit (Science Orbit): 717 km Mean Altitude 92° Inclination 369 Days Repeat Cycle 30 Days Subcycle 7.5 km Inter-Track Spacing at Equator

11 Nominal Ground Track of one Sub-Cycle

12 Cross-overs per 10 4 km 2 per year

13 CryoSat Data Products Level 0 - 1 Level 1 - 1b Level 2 - 3 Level 3 - 4 Level 1b - 2 Coherent, Pulse-limited Radar Echoes Coherent Synthetic Beams Multi-looked Beams & Phases Along-track Ice Elevations Spatially & Temporally Averaged Ice Thickness Secular trend in ice thickness ~ 400 Gbit/day ~ 3 Gbit/day ~ 20 Mbit/day ~ 1 Mbit/day ~20kbit/day ~ 400 Gbit/day

14 L0 - L1b Beam Formation & Steering

15 Doppler Beam Stack Over Spherical Surface Level 1B Multi-looked Echoes L0 - L1b Stack & Multi-looking

16 Simulated ‘SAR’ L1b - L2 Product

17 Conclusions Major improvements over ice surfaces due to synthetic- aperture interferometric (InSAR) processing Data is orbit oriented (not imaging) Low point-to-point covariance due to speckle  Most reliable for 10 4 km 2 spatial / 1 month temporal resolution Access to data through ESA Data-AOs Uncertainties will be addressed by extensive validation See you at: http://www.cryosat.de

18 Sea ice freeboard retrieval

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