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|TanDEM-X Science Service System|
|Title||Waves, wind and currents effect on the sea surface roughness characteristics and its application to the study of ocean-atmosphere interactions: Algorithms validation.|
|Investigator||Esquivel-Trava, Bernardo - Insituto de Investigaciones Oceanologicas - UABC, Physical Oceanography,|
The assessment of the sea-state as well of the wind and currents on large areas of the ocean may be performed solely through the analysis of space-borne Synthetic Aperture Radar. Analyses of SAR images have rendered, contrastingly, detailed information about the spatial variability of winds and waves in coastal areas. Wave inversion algorithms derived to estimate the low frequency part of the spectra from C-Band SAR are currently in use by research centers and Met offices and have proven relatively accurate to study the spatial evolution of 2D spectrum. However we consider that it is fundamental to have tools to extract the SAR wave spectrum and other potentially important information from new operational satellite, such as Terra SAR-X imagery with higher resolution that has the potential to provide estimates of a broader range of the spectrum, even without a wave inversion scheme.
The Center for Scientific Research and Higher Education of Ensenada (CICESE, for its acronym in spanish) is leading project for oceanographic observations in case of oil spills in the Gulf of Mexico. The Mexican Government funds this project, with the Sectorial Fund of the National Council of Science and Technology, and the Energy Secretariat(CONACY-SENER/Hydrocarbons S0018-2012-01, porject 201441).
One of the objectives of this project is to investigate the influence of wind and waves in the surface currents,identifying the relevant components in the momentum flux between the atmosphere and the ocean. Oceanographic and meteorological marine buoys (ASIS type buoys)will be deployed in at least 8 locations, fitted with sensors with the purpose of providing information of waves, surface winds and currents, and wind and current turbulent fluctuations. Specific objectives include the assessment of the spatial structure and variability of the wind field and general sea-state during strong-events such as Northerly winds frontal zones and hurricanes. In addition there is a current project (RugDisMar - 155793), fundedby CONACYT, in the Gulf of Tehuantepec to make ASIS buoy measurements for the assessment of the spectrum evolution and spatial variability of fetch-limited waves generated by gap-winds (commonly called Tehuano winds).
We consider that this projects offers a valuable opportunity to validate and improve existing algorithms to obtain information about waves, winds and surface currents from SAR images. Also the use of SAR images will be a great advantage for the study of the characteristics of the sea surface roughness and its application in the ocean-atmosphere interaction.Specifically it will be a valuable contribution to incorporate information derived from SAR images in studies about momentum, CO2 and water fluxes between the atmosphere and the ocean.Relevant results will be presented in proper academic workshops and meetings; they will as well be submitted for publication to ad-hoc scientific journals.
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