Cryosat esa s ice mission measuring change in the earth s ice fields
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CryoSat: ESA’s Ice Mission Measuring change in the Earth’s ice fields. J érôme Benveniste slides from Mark R. Drinkwater & Richard Francis. Antarctic Ice-Cap. Courtesy National Geographic. Antarctic Elevation Change: 1992-2003. Wingham et al., 2006.

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Cryosat esa s ice mission measuring change in the earth s ice fields

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

Jérôme Benveniste

slides from

Mark R. Drinkwater & Richard Francis


Antarctic ice cap
Antarctic Ice-Cap

Courtesy National Geographic


Antarctic elevation change 1992 2003
Antarctic Elevation Change: 1992-2003

Wingham et al., 2006


Greenland elevation change 1992 2003
Greenland Elevation Change: 1992-2003

Johannessen et al., 2005


Arctic sea ice
Arctic Sea-Ice

National Geographic

NOAA


Sea ice thickness
Sea-Ice Thickness

Courtesy: R. Francis


Sea ice thickness measurements from space
Sea-Ice Thickness Measurementsfrom Space

Courtesy: R. Francis


Sea ice thickness measurements from space1
Sea-Ice Thickness Measurements from Space

Courtesy: R. Francis


Sea ice thickness measurements from space2
Sea-Ice Thickness Measurements from Space

Courtesy: R. Francis


Arctic sea ice thickness
Arctic Sea-Ice Thickness

Courtesy S. Laxon


Limitations of footprint size
Limitations of Footprint Size

Image: SIR-C/X NASA JPL


Cryosat s high resolution
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 resolution1
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
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


The effect of snow
The Effect of Snow

Courtesy: R. Francis


The effect of snow1
The Effect of Snow

Courtesy: R. Francis


Cryosat instruments

Star Trackers

Magnetometer

SIRAL Antennas

Thermal Radiator

Laser Retroreflector

S-Band Communications

Antenna

DORIS

Antenna

X-Band Downlink

Antenna

CryoSat Instruments


Siral mode operation
SIRAL Mode Operation

92˚ inclination, 369-day repeat, 30-day subcycle




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.

Summary