ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 3, pp. 73-87

Radar manifestations of ship wakes in areas of intense phytoplankton bloom

M.I. Mityagina1 , O.Yu. Lavrova1 
1 Space Research Institute RAS, Moscow, Russia
Some aspects of the visibility of wakes behind moving ships in satellite radar imagery are discussed. The basic data are satellite radar images obtained by advanced synthetic aperture radar (ASAR) on board Envisat satellite of the European Space Agency. Remotely sensed data in visible and IR bands taken by sensors Envisat MERIS, Terra/Aqua MODIS. Landsat-5 TM and Landsat-7 ETM+ are involved into consideration as well. Instances of radar signatures of the ship wakes were detected in radar images obtained in the course of a satellite monitoring campaign of the central and southeastern Baltic. These ship wakes are manifested in radar images as relatively narrow strips of enhanced backscattered signal following the ship path. The large amount of the data available allowed us to make some generalizations and obtain statistically reliable results concerning main spatial and temporal characteristics of this type of ship wake manifestations in SAR images of the sea surface. It was found that these wakes are considerably long-lasting structures and their lengths can reach hundreds of kilometers. A significant seasonal and year-to-year variability of these ship wake manifestations in radar images is revealed. Possible factors facilitating formation of this type of ship wake radar manifestations are found out. The hypothesis is put forward of the coherence of this type of ship wakes detected in sea surface radar imagery and areas of intense phytoplankton bloom.
Keywords: satellite radar imagery, satellite monitoring, sea surface, ship wakes, phytoplankton, the Baltic Sea, algae bloom
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