Why SAR wave mode of ERS and Envisat data are insufficient to which the probability of occurrence of waves Freak?  


Author:
Peter Janssen
Werner Alpers


Institution
ECMWF, Shinfield Park, Reading RG2 9AX, United Kingdom Institut für Meereskunde, Universität Hamburg, Bundesstrasse 53, D-20146 Hamburg, Germany


Summary
It would be desirable to have a tool for the global recognition for the phenomenon of rogue states or on the surface of the ocean Waves. Based on the theory of SAR imaging of the surface of the ocean waves developed in the 1980's, argues Despite the recent period, which claim the contrary, it is not possible for the data to SAR wave mode and the ERS The Envisat satellite.


The main reason is that due to the movement of the surface of the sea, the SAR imaging Mechanism is usually not very linear. The resolution SAR images of the ocean is a place very distorted wave Pictures of the ocean wave city, which is little resemblance to the reality of city water. The exceptions are Perhaps if narrow-band trains Swell on the rank in the direction of the wind, a lack of marine However, These cases are rare and can not be regarded as a representative cross-section of the global division of the sea, the United States.


The courts of the highest in the SAR image of the intensity or the "groupiness" picture distribution of intensity not Not as a rule are the locations for the maximum amplitude of the waves or in the "groupiness" in the water. So it is not possible to deal with this technology, reliable information on the probability of occurrence Extreme waves of the ocean in global


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