1. SPETTROSCOPIA 2 FISICA AMBIENTALE 2 Antonio Ballarin Denti a.ballarindenti@dmf.unicatt.it

2. HALOEs gas filter radiometer concept

3. HALOEs HCl narrow-band spectral function to selectively defect HCl

4. HALOE optical diagram. The different gases are detected at different λ. By splitting the spectrum by means of dichroic beamsplitters, parallel detection of all eight gases is possible

5. HALOE HCl, HF, CH 4, O 3, H 2 O and NO zonal mean mixing ratios obtained on 5 May (HCl and HF) and 7 May (the other gases) 1992 at 34°N compared to these same mixing ratios obtained on 5 May at 29°N by the ATMOS satellite. Note the different axes in the different figures.

6. LIDAR: aspetti fisici e tecnici The off wavelength: only scattering, no absorption. A simple representation of the optical DIAL process. The on wavelenght

7. SPETTROSCOPIA AMBIENTALE LIDAR: aspetti fisici e tecnici

8. Ozone absorption cross-section at 195 K. Absorption is most effective at 255 nm.