======Impact on cloud optical thickness and droplet size on radiance field, visibility of cloudbow======

Calculate the upwelling radiance at 500nm the top of the atmosphere for an atmosphere including a liquid water cloud layer. Use the discrete ordinate method with intensity correction for your simulation (//rte_solver disort2//). Vary the cloud optical thickness (//wc_set_tau//) and effective droplet size (in wc.dat) and describe the results.

//Hints://

  * Use the libRadtran input file and the plotting script from [[teaching:radiative_transfer:disort_nstr1|exercise 6]] to start.
  *Look at [[teaching:radiative_transfer:disort_nstr2|exercise 8]] to see how a cloud layer is defined in libRadtran.

====== Varying Droplet Size: ======

[{{ :teaching:radiative_transfer:wc_toa_up_2mu.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 2 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_10mu.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 10 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_25mu_500nm.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 25 mu}}]

====== Varying Wavelength: ======


[{{ :teaching:radiative_transfer:wc_toa_up_25mu_350nm.png | TOA, Sun at Zenith, Upwelling Radiation at 350 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 25 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_25mu_750nm.png | TOA, Sun at Zenith, Upwelling Radiation at 750 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 25 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_25mu_lwc001_350_500_750.png | TOA, Sun at Zenith, Upwelling Radiation at 350nm (blue), 500nm (yellow) 750 nm (red), Cloud 2-3 km, LWC 0.01, Droplet Radius 25 mu}}]

====== Varying LWC: ======


[{{ :teaching:radiative_transfer:wc_toa_up_10mu_500nm_lwc0001.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.001, Droplet Radius 10 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_10mu.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 10 mu}}]
[{{ :teaching:radiative_transfer:wc_toa_up_10mu_500nm_lwc025.png | TOA, Sun at Zenith, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.25, Droplet Radius 10 mu}}]

[{{ :teaching:radiative_transfer:aerosol_nstr16.png | TOA, Sun at 30°, Upwelling Radiation at 500 nm, Cloud 2-3 km, LWC 0.01, Droplet Radius 10 mu}}]