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Published byCarmella Whitehead Modified over 9 years ago
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Scatterometer wind retrieval over Lake Baikal Alexey Pan’kov (Irkutsk State University)
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Necessity Helios wind forcing sun radiation
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BeforeNow Situation
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Principle 1 2 3
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Normalized radar backscatter cross-section (σ 0 ) wave length (should be of order of roughness) polarization incidence angle roughness ⇒ wind speed wind direction σ 0 is a function of:
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σ 0 measurement
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Model function σ 0 = F(V, θ, α, pol) wave length is given V - wind speed θ - wind direction α - incidence angle pol - polarization
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Model function wind speed dependence
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Model function wind direction dependence
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σ 0 for Lake Baikal (4 Aug 2008)
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Wind areas (WVC)
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Maximum likelihood estimation maximum likelihood minimum mean squares
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speed angle Error surface speed angle gradient search Two ambiguities
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Problems Ambiguity removal Quality control (rain) Too high velocities Historical data are unavailable yet Lack of appropriate infrastructure
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Thank you for your attention!
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smooth surfacerough surface
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