CryoSat hits land

Dec 21, 2012
Altimeter reading over Cuba. Credit: ESA

(Phys.org)—ESA's ice mission is now giving scientists a closer look at oceans, coastal areas, inland water bodies and even land, reaching above and beyond its original objectives.

Launched in 2010, the polar-orbiting was developed to measure the changes in the thickness of ice, the elevation of the ice sheets that blanket Greenland and Antarctica, and .

The satellite's radar altimeter not only detects tiny variations in the height of the ice, it also measures sea level and the sea ice's height above water to derive with an unprecedented accuracy.

At a higher precision than previous altimeters, CryoSat's measurements of sea level are improving the quality of the model forecasts. Small, local phenomena in the like eddies can be detected and analysed.

Taking CryoSat a step further, scientists have now discovered that the altimetry readings have the potential to map closer to the coast, and even greater capabilities to profile land surfaces and inland water targets such as small lakes, rivers and their intricate tributaries.

Radar altimeters have more difficulty doing this because, compared to open measurements, the landscape surrounding inland water bodies is a lot more complex.

Location of the CryoSat ground track over Cuba, where range measurements are acquired at a resolution of 300 m. Credit: ESA

These had not been previously monitored with satisfying accuracy by conventional altimeters because the sensor footprints – about 5x5 km – were too large to detect subtle differences in the around small landforms.

CryoSat, however, has a resolution along its ground track of about 300 m.

CryoSat altimeter readings over the Danube River delta in eastern Romania. The radar image shows different radar reflection intensities from the Black Sea, Danube Delta’s wetland and elevated land. Over wetlands, due to the to the standing waters, points of bright radar reflections are pictured in red, whereas over sea or land they appear yellow. These readings are of unprecedented sharpness compared to previous altimeters. Credit: ESA

In order to thoroughly investigate the possibilities offered by CryoSat over water, ESA recently began scientific exploitation projects coined 'CryoSat+'.

Scientists are reprocessing large, raw and uncompressed sets of data coming directly from CryoSat to obtain new information on oceans, inland water bodies and land.

In the example pictured above, CryoSat's altimeter made readings over central Cuba, extending north and south into the surrounding water.

The image clearly shows the difference between the bright radar reflections from the steady water and the elevated land.

For instance, near the edges of the island, points of high radar reflection are pictured in red. This is due to the more placid waters of the bay and over coral reefs.

CryoSat altimeter readings over the Issyk Kul lake in Kyrgyzstan. The radar image shows varying intensities of radar reflections from the lake and surrounding land. CryoSat is able to measure the water surface elevation for the full extension of the lake and even track the lake basin slopes. Credit: ESA

Examples are also pictured over the Danube delta in eastern Romania, and the land-locked Issyk Kul lake in Kyrgyzstan.

"Thanks to CryoSat being operated over some inland water targets in high resolution mode, we were able to distinctly chart the contours of a flood that occurred last March at Rio Negro in the Amazon," said Salvatore Dinardo, working for ESA on CryoSat+.

Jérôme Benveniste, the ESA scientist who initiated the project, continued, "We were able to emphasise the unique capability to see the floodwater extent under the forest canopy, where optical sensors or even imaging radars are blocked by the trees."

Results from the project will be unveiled to the scientific community at the Third CryoSat User Workshop to be held in Germany at the Technical University of Dresden on 12–14 March.

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