Exercises 2

1. Exercises 2

2. Zurich “ozone hole and standard conditions” UV Index 17.3-17.8 UV Index 8.8-9.3 SZA=25.3 UV Index 27.7 UV Index 8.2 (150 DU)

3. Calculate the Vitamin D weighted irradiance for total ozone amounts of 280, 300, 320, 340 DU and determine from these calculations the Radiation Amplification Factor. The Radiation Amplification Factor describes the sensitivity of radiation to changes in an atmospheric parameter. The RAF is usually used to estimate the sensitivity of weighted effective radiation I to small changes in atmospheric ozone W: For Vitamin D the same approach yields a larger RAF of -1.48. Using neighboring pairs again results in similar RAF values (range from -1.34 to -1.51).

5. Calculate the diffuse, direct and global erythemal and UV weighted irradiances for different solar zenith angles. Plot graphically and discuss the results. ERY UV

6. Calculate the spectral irradiance (290 to 400 nm) for several albedo values between 0.04 (grass), and 0.9 (fresh snow) and two total column ozone amounts (for example 300 and 500 DU). Plot graphically (ratio relative to grass albedo) and discuss the results.

7. Calculate the spectral irradiance (290 to 400 nm) for several albedo values between 0.04 (grass), and 0.9 (fresh snow) and two total column ozone amounts (for example 250 and 500 DU). Plot graphically (ratio relative to grass albedo) and discuss the results. FastRT

8. Where does the Maximum at 320 nm come from??? Combination of absorption by ozone (tropospheric) and rayleigh scattering