HOME >> MEDICINE >> NEWS
Envisat making first direct measurements of ocean surface velocities

For more than a decade space-based radar instruments have been routinely observing ocean surface phenomena including wind, waves, oil slicks, even the eyes of hurricanes. Now employing the same principle as police speed guns satellite radar has also begun to enable direct measurements of the speed of the moving ocean surface itself.

The oceans that cover 71% of the Earth's surface are constantly in motion. Ocean surface currents can lead to strong interaction with wind and waves, and through the transfer of heat influence the weather. Their dynamic range in the mesoscale is broad, with features such as current eddies and fronts, occurrences of filaments and jets, and wind-driven coastal upwelling or downwelling.

High-resolution surface current observations on a large scale are very difficult, although satellite altimeters permit monitoring of sea level anomalies that are related to surface currents. Sea surface temperature and ocean colour measurements also throw light on ocean circulation pattern and seasonal variations.

However Synthetic Aperture Radar (SAR) instruments such as the ASAR on ESA's Envisat have now been demonstrated to potentially offer a more direct and therefore very valuable source of high-resolution information for oceanographers.

SAR sensors record microwave radar backscatter in order to identify patterns of surface roughness. Indeed, over the ocean these patterns are linked to varying surface winds and currents in particular current shear and varying convergence zones that can focus wave energy, resulting in increased wave steepening and enhanced radar-detectable roughness changes. Unfortunately, interpreting radar images to accurately identify and quantify such signatures has been easier in theory than in practice.

"Due to a general lack of sufficient high-quality in-situ observations, the understanding of how these dynamic features contribute to the complicated surface roughness modulation pattern
'"/>

Contact: Mariangela D'Acunto
mariangela.dacunto@esa.int
39-069-418-0856
European Space Agency
27-Mar-2006


Page: 1 2 3 4 5

Related medicine news :

1. European Space Agencys Envisat captures breath of volcano
2. First greenhouse gas animations produced using Envisat SCIAMACHY data
3. ESA donates mosaic of global images taken by Envisat to United Nations
4. Envisat altimeter watches Pacific for cold tongue of La Niña
5. Envisat sees smoke from Europes worst peacetime fire
6. Breath of the dragon: ERS-2 and Envisat reveal impact of economic growth on Chinas air quality
7. Envisat monitoring China floods as part of Dragon Programme
8. Sleep deprivation can threaten competent decision-making
9. Decision making by the growing elderly population is uncharted territory
10. MRI contrast agent can detect heart attack in the making
11. Grace under pressure: FSU researchers analyze the effects of stress on decision-making ability

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/20/2019)... ... March 20, 2019 , ... ... real healer is within. , George Goodheart ... for the Highly Sensitive Person (HSP): A Mini-Encyclopedia of Ways to Develop and ...
(Date:3/20/2019)... ... March 20, 2019 , ... ... from disc herniation's, degenerative disc disease, spinal stenosis, sciatica and numbness in the ... , At Advanced Spine Joint and Wellness provider's work as a team/services ...
(Date:3/20/2019)... ... March 20, 2019 , ... Capio®, the leading ... from 2017 to 2018. In total, sales generated for 2018 were the highest ... teams delivered significant accomplishments and milestones in 2018. In addition to achieving record ...
(Date:3/20/2019)... ... March 20, 2019 , ... ... new service, CardioCHECK a new way to diagnose cardiac arrhythmias in the patient’s ... with cardiac arrythmias by utilizing mobile cardiac telemetry (MCT) in the convenience and ...
(Date:3/20/2019)... N.C. (PRWEB) , ... March 20, 2019 , ... ... launched a new CBD oil vape brand – Mingo Rad. , Mingo ... Sourcing exclusively from domestic hemp and crafted with a unique manufacturing process, Mingo ...
Breaking Medicine News(10 mins):
(Date:3/20/2019)... , ... March 20, 2019 , ... “Some years ago, ... success biofeedback had in Canada in preparing our military athletes for the annual competitions ... thirty-four different nations. I know also that today biofeedback is used to help servicemen ...
(Date:3/20/2019)... ... , ... Becker's Hospital Review is pleased to announce three ... held May 2-4 at the Swissotel in Chicago. The celebrity keynotes include:, ... NFL Legend; ,     Bobbi Brown, Makeup Artist, Author, Entrepreneur and Founder ...
(Date:3/20/2019)... ... March 20, 2019 , ... ... residential services’ patients Stay Active & Independent for Life (SAIL). At the core ... balance, and fitness can help adults stay active and reduce their chances of ...
Breaking Medicine Technology:
Cached News: