REMOTE-SENSING OF MASS FLUXES OF TRACE GASES IN THE BOUNDARY-LAYER

The combination of remote sensing methods like Doppler lidar and FTIR offers the possibility to determine mass fluxes of gases remotely. Dop pler lidar measures the three-dimensional wind vector in the vicinity of diffuse sources or the velocity of air in a chimney plume if an ind ustrial complex is monitored. FTIR is a multicomponent remote sensing method for gas concentrations. The Fourier transformation of an interf erogram of a Michelson interferometer within a FTIR system converts th e recorded intensity (function of optical path length) to a spectral s ignal (function of wavenumber). Both information, velocity and concent ration, give the mass fluxes of the tracer (gas). A first test was per formed at Munich-North power station with FTIR and cw-Doppler lidar. F luxes of CO2, CO, NO, and HCl were determined. The results are in good agreement with the fluxes measured by in-situ instruments of the powe r station. The method can be used to control industrial complexes from an outside observation site.