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E. Carboni, R. Grainger University of Oxford R. Siddans, C. Poulsen, B. Latter

Fast 2 layer cloud forward model. E. Carboni, R. Grainger University of Oxford R. Siddans, C. Poulsen, B. Latter Rutherford Appleton Laboratory. Fast FM – SOLAR – Bidirectional reflectance. 1 layer with lambertian surface reflectance R S. Bidirectional surface reflectance. WARNING:

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E. Carboni, R. Grainger University of Oxford R. Siddans, C. Poulsen, B. Latter

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  1. Fast 2 layer cloud forward model E. Carboni, R. Grainger University of Oxford R. Siddans, C. Poulsen, B. Latter Rutherford Appleton Laboratory

  2. Fast FM – SOLAR – Bidirectional reflectance 1 layer with lambertian surface reflectance RS Bidirectional surface reflectance WARNING: LUTs angles!

  3. Fast FM – SOLAR – Black sky albedo of cloud-surface system

  4. Fast FM – SOLAR – White sky albedo of surface-cloud system

  5. Fast FM - SOLAR Combining with gas absorption Transmittances below the cloud Transmittances above the cloud RSBRDF = RSBRDF * Tbc(q0) * Tbc(qv) RSblack = RSblack * Tbc(q0) * Tbc(qd) RSwhite = RSwhite * Tbc(qd) * Tbc(qd) RBRDF, Rblack, Rwhite of the surface-cloud system are used in input as ‘surface reflectance’ paramenter for the second cloud layer. 2 layers: for 2 layer we call the SOLAR FM 2 times: first call Tac =1; second call Tbc =T between the 2 layer

  6. Fast FM – IR atm above a cloud layer l2 atm middle m cloud layer l1 atm. below b surface s 1 layer FM: 2 layers: we divide the atmosphere above ‘a’, middle ‘m’ and below ‘b’ (from RTTOV) and consider the cloud parameters precompiled in LUTs as for 1 layer model Atmospheric parameters as function of pervious 1 layer cloud model

  7. Fast FM – IR atm above a cloud layer l2 atm miidle m cloud layer l1 atm. below b surface s I1 I2 I3

  8. Fast FM vs DISORT – 1 Layer sza=20 view zenith=20 rel.azi.=50 Rs=0.001

  9. Fast FM vs DISORT – 1 layer Rs=0.4

  10. Fast FM vs DISORT – 1 layer

  11. Fast FM vs DISORT 2 layer sun normalize radiance in SOLAR and IR fast FM solar zenith angle=20 view zenith=20 relative azimut=50 Lambertian surface Rs=0.001

  12. Fast FM vs DISORT – SOLAR – 2 layer

  13. Fast FM vs DISORT – SOLAR – 2 layer

  14. Fast FM vs DISORT – IR – 2 layer

  15. Fast FM vs DISORT - IR

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