Analysis of SAR Data of the Polar Oceans: Recent Advances by Professor Dr. Costas Tsatsoulis, Dr. Ronald Kwok (auth.)

By Professor Dr. Costas Tsatsoulis, Dr. Ronald Kwok (auth.)

This publication stories contemporary advances within the use of SAR imagery for operational functions and for aiding technological know-how investigations of the polar oceans. the $64000 parameters which might be extracted from spaceborne SAR imagery are mentioned. Algorithms utilized in such analyses are defined and information structures utilized in generating the ocean ice items are provided.

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3. 1987. (Adapted from Barber et al. 1995) thick first-year and multiyear sea ice follows a form approximated in Fig_ 3. 1987) we can summarize the seasonal evolution of 0'0 as follows: Winter. Within multiyear sea ice, microwave scattering is very stable during the winter period. The primary scattering mechanism is the bubble structure within the surface hummock layer (Onstott 1992). Older forms of ice appear to have a higher magnitude of scattering, due to the larger and deeper hummock layers which contain larger bubble sizes spaced further apart within the hummocks (Barber et al.

Later in the season we observe increased variability in each of the flux terms. The net radiative flux for the snow-sea ice-ocean volume is positive, but the radiation balance at the snow surface, Q* ,s> remains negative owing to the transmission of the solar radiation beyond the volume's near surface. Radiation absorbed within the snow volume is comparable in magnitude with Q*. The surface volume is more strongly coupled to the atmosphere, as turbulent losses to the atmosphere represent the major energy sink.

In time series 1 the gradual rise in both E' and E" corresponded to an observed decrease in 0'0. The downturn in both E' and E" after day 123 corresponded to an increase in 0'0 back to a magnitude in scattering similar to the beginning of the time series. 1986). Our diagnostic model predicted a decrease in the volume scattering 0'0 v term and an increase in the surface scattering 0'0, term for the range of parameters in time series 1. The decrease in 0'0v was smaller than the increase in 0'0, because of the low magnitude of the dielectric constant in the snow volume, so that the total scattering term 0'0 tended to increase over the period where the ERS-1 0'0 was observed to be decreasing.

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