Showing papers by "Vladimir Kudryavtsev published in 1997"

Search of Ocean Convergence Zones via the Observation of Whitecap Coverage Application to Fishery

Abstract: As known since long, some kinds of fish (e.g. pelagic) gather in frontal and/or convergence zones (Uda, 1952). On the other hand these current features result in enhanced wave breaking (Uda, 1938). It is of clear interest to utilize these properties for the fishery industry, and more, to apply remote sensing from space in that. The following topics of this scope are discussed in present paper. 1. Obviously mesoscale currents of 10-100 km size (rather then smaller ones) are the first candidate to be observable from space. Here some evidence of wavebreaking response to mesoscale currents are presented on the basis of our experiments. 2. An attempt to search the mesoscale zones of the greatest current gradients (or possible fishery regions) in Norwegian Sea is described. 3. Application of microwave radiometric technique to searching the oceanic current peculiarities from space is discussed on the basis of theoretical estimation.

Research on the gulf stream frontal zone using synthetic-aperture radar of the almaz-1 spacecraft and contact shipboard measurements

Abstract: The results of a joint analysis of data recorded quasisynchronously in the Gulf Stream frontal zone by a radar with a synthetic aperture radar (SAR) carried aboard the Almaz-I spacecraft and the Akademik Vernadskiy research ship (contact measurements) are presented. It is shown that the dark linear structures visible on SAR images are radar images of zones of current convergence, in which surfactants are accumulated, suppressing cm-length ripples. In the case of wave propagation in the same direction as the current, the effects of refraction and reflection of surface waves, leading to the formation of regions of concentration of waves at the current boundaries and in the wave “shadow” region, are detected and investigated.