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CryoSat: ESA’s Ice Mission Measuring change in the Earth’s ice fields

CryoSat is ESA's first dedicated satellite for studying the polar regions and measuring the rates of change in ice sheets and marine ice masses. This presentation includes slides from Jérôme Benveniste, Mark R. Drinkwater, and Richard Francis, showcasing the Antarctic and Greenland ice caps, Arctic sea ice, and sea ice thickness measurements from space. The CryoSat satellite's high-resolution capabilities and orbit coverage are also discussed.

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CryoSat: ESA’s Ice Mission Measuring change in the Earth’s ice fields

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  1. CryoSat: ESA’s Ice MissionMeasuring change in the Earth’s ice fields Jérôme Benveniste slides from Mark R. Drinkwater & Richard Francis

  2. Antarctic Ice-Cap Courtesy National Geographic

  3. Antarctic Elevation Change: 1992-2003 Wingham et al., 2006

  4. Greenland Elevation Change: 1992-2003 Johannessen et al., 2005

  5. Arctic Sea-Ice National Geographic NOAA

  6. Sea-Ice Thickness Courtesy: R. Francis

  7. Sea-Ice Thickness Measurementsfrom Space Courtesy: R. Francis

  8. Sea-Ice Thickness Measurements from Space Courtesy: R. Francis

  9. Sea-Ice Thickness Measurements from Space Courtesy: R. Francis

  10. Arctic Sea-Ice Thickness Courtesy S. Laxon

  11. Limitations of Footprint Size Image: SIR-C/X NASA JPL

  12. CryoSat’s High-Resolution • Transmits bursts of 64 pulses: sequential echoes are correlated • Satellite moves 250 m between bursts • Aperture Synthesis technique gives 250 m along-track resolution, much higher than conventional altimeters (ERS-2/Envisat RA-2) • SAR Mode used over sea-ice to measure ice-floe freeboards and retrieve thickness

  13. CryoSat’s High-Resolution • Transmits bursts of 64 pulses: sequential echoes are correlated • Satellite moves 250 m between bursts • Aperture Synthesis technique gives 250 m along-track resolution, much higher than conventional altimeters (ERS-2/Envisat RA-2) • SAR Mode used over sea-ice to measure ice-floe freeboards and retrieve thickness • SARIn mode used to measure topographic surfaces: interferometry

  14. CryoSat’s Orbit Coverage • inclination: 92° • repeat cycle: 369 days • sub-cycle: 30 days • inter-track spacing: 7.5 km • orbit control: ±1 km • altitude: 717 km • not sun-synchronous Courtesy: R. Francis

  15. The Effect of Snow Courtesy: R. Francis

  16. The Effect of Snow Courtesy: R. Francis

  17. Star Trackers Magnetometer SIRAL Antennas Thermal Radiator Laser Retroreflector S-Band Communications Antenna DORIS Antenna X-Band Downlink Antenna CryoSat Instruments

  18. SIRAL Mode Operation 92˚ inclination, 369-day repeat, 30-day subcycle

  19. CryoSat Launch: 8 Oct 2005

  20. Timescale: Perfect Timing

  21. Are humans really changing the polar environment? CryoSat – ESA’s first dedicated satellite for study of the polar regions – is focused on answering this question. CryoSat will deliver quantitative data on the rates of change of ice sheet and marine ice masses. Summary

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