Navigation Links
CryoSat goes to sea
Date:5/29/2012

CryoSat was launched in 2010 to measure sea-ice thickness in the Arctic, but data from the Earth-observing satellite have also been exploited for other studies. High-resolution mapping of the topography of the ocean floor is now being added to the ice mission's repertoire.

The main objective of the polar-orbiting CryoSat is to measure the thickness of polar sea ice and monitor changes in the ice sheets that blanket Greenland and Antarctica. But the satellite's radar altimeter is not only able to detect tiny variations in the height of the ice but it can also measure sea level.

The topography of the ocean surface mimics the rises and dips of the ocean floor due to the gravitational pull. Areas of greater mass, such as underwater mountains, have a stronger pull, attracting more water and producing a minor increase in ocean-surface height.

Therefore, instruments that measure sea-surface height incidentally map the ocean floor in previously uncharted areas.

There have been several recent global gravity missions, such as ESA's GOCE satellite, that provide extraordinarily accurate measurements of gravity at the spatial resolution of hundreds of kilometres.

But CryoSat's radar altimeter can sense the gravity field at the ocean surface, so that seafloor characteristics at scales of 5-10 km are revealed. This is the first altimeter in 15 years to map the global marine gravity field at such a high spatial resolution.

Recent studies at the Scripps Institution of Oceanography in San Diego, USA, found that the range precision of CryoSat is at least 1.4 times better than the US's Geosat or ESA's ERS-1.

They estimate that this improved range precision combined with three or more years of ocean mapping will result in global seafloor topography bathymetry that is 2-4 times more accurate than measurements currently available.

"We know more about the surfaces of Venus and Mars than we do about the bathymetry of deep oceans," said David Sandwell from the Scripps Institution of Oceanography in the US.

"This new mapping from CryoSat will revolutionise our understanding of ocean floor tectonics and reveal, perhaps, 10 000 previously uncharted undersea volcanoes."

Most satellite radar altimeters such as the one on the joint CNES/NASA/Eumetsat/NOAA Jason-2 follow repeated ground-tracks every 10 days to monitor the changes in ocean topography associated with ocean currents and tides.

CryoSat's 369-day repeat cycle provides a dense mapping of the global ocean surface at a track spacing of over 4 km. Three to four years of data from CryoSat can be averaged to reduce the 'noise' due to currents and tides and better chart the permanent topography related to marine gravity.


'/>"/>

Contact: Robert Meisner
robert.meisner@esa.int
European Space Agency
Source:Eurekalert

Related biology news :

1. CryoSat-2 exceeding expectations
2. Successful launch for ESAs CryoSat-2 ice satellite
3. CryoSat-2 ready for launch
4. CryoSat-2 installed in launch silo
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/7/2016)... BioCatch , the global leader in behavioral biometrics, reported a ... over 40 granted and pending patents. ... , The Company,s IP portfolio expansion ... Device, and Method Estimating Force Applied to a Touch Surface, " ... components needed to estimate the force and pressure applied to touch surfaces ...
(Date:12/6/2016)... RALEIGH, N.C. , Dec. 6, 2016 ... technology, announced today it has seen a third consecutive ... biometric sensor technology in 2016 with a 360 ... over last year. This increase was driven by sales ... well as robust interest in its technology for hearables ...
(Date:12/2/2016)... , Dec. 1, 2016   SoftServe , ... BioLock , an electrocardiogram (ECG) biosensor analysis ... a key IoT asset. The smart system ensures ... vehicle,s steering wheel and mobile devices to easily ... As vehicle technology advances, so too ...
Breaking Biology News(10 mins):
(Date:12/7/2016)... , Dec. 7, 2016 Neogen Corporation (NASDAQ: ... Dr. Dan Kephart as its chief science ... will assume his responsibilities at Neogen effective Jan. 1. ... director for the agribusiness unit of Thermo Fisher Scientific, ... at Life Technologies. His extensive industry experience also includes ...
(Date:12/7/2016)...  Nordion, a standalone business of Sterigenics International, ... award by the United States Department of Energy,s ... Phase II cooperative agreement funding to GA to ... of Missouri Research Reactor Center (MURR ® ). ... of a new, reliable supply of molybdenum 99 ...
(Date:12/7/2016)... ROCHESTER, Minn. , Dec. 7, 2016  Vyriad ... McQuinn to the company,s Board of Directors. ... board as we build our business and develop our ... for cancer therapy," said Stephen Russell , MD, ... Mary Agnes , share our vision and passion for ...
(Date:12/7/2016)... and ANN ARBOR, Mich. ... held biopharmaceutical company developing breakthrough immune modulatory medicines, announced ... of the Company,s lead therapeutic candidate, LYC-30937- E nteric ... often a debilitating skin disease that is estimated to ... the United States , with approximately 1.5 - ...
Breaking Biology Technology: