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Roughness Effect on IR Emissivity

3 rd IR/MW Emissivity Group Meeting (sep. 04, 2008). Roughness Effect on IR Emissivity. Sungwook Hong, Fuzhong Weng, and Banghua Yan. Outline. • Concept • Physical Model • Results • Summary. Concept. Reflectance : specular + diffuse component => Reduced Specular. Physical Model.

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Roughness Effect on IR Emissivity

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  1. 3rd IR/MW Emissivity Group Meeting (sep. 04, 2008) Roughness Effect on IR Emissivity Sungwook Hong, Fuzhong Weng, and Banghua Yan

  2. Outline • Concept • Physical Model • Results • Summary

  3. Concept Reflectance : specular + diffuse component => Reduced Specular

  4. Physical Model * Ω: Roughness Effect ( Ω = 1 for specular surface) It can be converted as follows: where

  5. * Test results (1)

  6. a. Ω = 0.5 * Test results (2):Applying to IASI Observation b. Ω = 0.5

  7. Other Approach 1) R(rough) = ρ(θ,σ/λ)·R0(specular)

  8. Summary •Topic : Roughness Effect in IR frequency • Results : - Roughness Effect ↑ vs. Emissivity↓ (or vice versa) - Roughness Effect < 5% for IR frequency • Future work : -Test using the various satellite observation ex) over ocean using AVHRR

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