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

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Presentation transcript:

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

Antarctic Ice-Cap Courtesy National Geographic

Antarctic Elevation Change: Wingham et al., 2006

Greenland Elevation Change: Johannessen et al., 2005

Arctic Sea-Ice National Geographic NOAA

Sea-Ice Thickness Courtesy: R. Francis

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

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

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

Arctic Sea-Ice Thickness Courtesy S. Laxon

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

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

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

CryoSat’s Orbit Coverage Courtesy: R. Francis 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

The Effect of Snow Courtesy: R. Francis

The Effect of Snow Courtesy: R. Francis

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

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

CryoSat Launch: 8 Oct 2005

Timescale: Perfect Timing

Summary 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.