GRL cover publication: Improving ocean surface velocity measurements from space

The Nansen Centers in Bergen and St. Petersburg in cooperation with IFREMER and BOOST Technologies in France obtained the cover publication in Geophysical Research Letter.

Advanced synthetic aperture radar (ASAR) signals collected by ESA´s Envisat help scientists map surface currents in the world oceans. As demonstrated, ASAR is a valuable source of high-resolution information on the line-of-sight roughness and velocity of the moving ocean surface. The velocity is estimated from careful examination and analyzes of residual Doppler frequency shifts extracted from the ASAR scenes at a spatial resolution of about 5-10 km. Using this methodology Johannessen et al. consistently derived both kinematic and dynamic properties of the ocean surface roughness. The authors compared the observations with advanced simulations as well as altimeter-based surface current measurements, finding good agreement to motivate further research to integrate the derived characteristics of ocean surface motion into broader models. This can help scientists learn more about mesoscale and sub-mesoscale upper ocean dynamics, coupled physical-biogeochemical processes and air-sea interactions in intense current regimes.

Title: Direct ocean surface velocity measurements from space: Improved quantitative interpretation of Envisat ASAR observations

Authors:

J. A. Johannessen: Nansen Environmental and Remote Sensing Center, Bergen, Norway; also at Geophysical Institute, University of Bergen, Bergen, Norway.

B. Chapron: Institute Francais de Recherche pour l´Exploitation de la Mer, Plouzané, France;

F. Collard and A. Mouche: BOOST Technologies, Brest, France; now at CLS-Direction of Radar Applications, Plouzané, France;

V. Kudryavtsev: Nansen International Environmental and Remote Sensing Center, St. Petersburg, Russia; Also at Nansen Environmental and Remote Sensing Center, Bergen, Norway; also at Marine Hydrophysical Institute, Sebastopol, Ukraine;

D. Akimkov: Nansen International Environmental and Remote Sensing Center, St. Petersburg, Russia; now deceased;

K.-F. Dagestad: Nansen Environmental and Remote Sensing Center, Bergen, Norway.

Source: Geophysical Research Letters (GRL) paper 10.1029/2008GL035709, 2008

http://www.nersc.no/WebData/www.nersc.no/Publications/GRL_doppler-2009-J...

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