Satellite cousins have ice covered
16 December 2016
Although not designed to deliver information on ice, ESA's Earth Explorer SMOS satellite can detect thin sea-ice. Since its cousin CryoSat is better at measuring thicker ice, scientists have found a way of using these missions together to yield an even clearer picture of the changing Arctic.
Carrying a radiometer, SMOS was designed to capture images of brightness temperature. While these images can be turned into information on soil moisture and ocean salinity to improve our understanding of the water cycle, it turns out this data can also be used to measure sea ice.
In contrast, CryoSat carries a radar altimeter that measures freeboard of sea ice, which is the distance between the waterline and the top of the ice.
This is being used to work out how the thickness of sea ice is changing and, in addition, how the volume of Earth's ice is being affected by the climate.