SPETTROSCOPIA 2SPETTROSCOPIA 2

FISICA AMBIENTALE 2FISICA AMBIENTALE 2

Antonio Ballarin DentiAntonio Ballarin Dentia.ballarindenti@dmf.unicatt.ita.ballarindenti@dmf.unicatt.it

HALOE’s gas filter radiometer conceptHALOE’s gas filter radiometer concept

HALOE’s HCl narrow-band spectral function HALOE’s HCl narrow-band spectral function to selectively defect HClto selectively defect HCl

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

HALOE HCl, HF, CH4, O3, H2O and NO zonal mean mixing ratiosobtained 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.

LIDAR: aspetti fisici e tecniciLIDAR: aspetti fisici e tecnici

The “off wavelength”: only scattering, no absorption.

A simple representation of the optical DIAL process. A simple representation of the optical DIAL process.

The “on wavelenght”

SPETTROSCOPIA AMBIENTALESPETTROSCOPIA AMBIENTALELIDAR: aspetti fisici e tecniciLIDAR: aspetti fisici e tecnici

LIDAR: aspetti fisici e tecniciLIDAR: aspetti fisici e tecnici

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