PHY2505 - Lecture 16 Lidar remote sensing.

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Presentation transcript:

PHY2505 - Lecture 16 Lidar remote sensing

LIDAR backscatter instrument From Tom Duck, Atmospheric Optics Lab, Dalhousie emitted received time

LIDAR backscatter instrument aerosol properties

LIDAR backscatter

LIDAR backscatter retrieval problem Need to relate backscatter coefficient, b, to volume extinction coefficient, s Generally use normalised power In differential form Assume relationships between b and s in the form b=asb Eg. Water cloud b~ 0.625s. Special case is to asume db/dr=0 – particles uniformly mixed along line of sight (slope method) General problems are 1) the b-s relationship 2) the instability of the solution due to ratio of small numbers (decreasing with range) 2s( r)

LIDAR backscatter profiles (From Stephens, 1994) Lidar backscatter from a typical marine boundary layer

Differential absorption LIDAR Retrieve aerosol properties and gas number densities (NA) from extinction of beam without knowledge of relations between b and s

Differential absorption LIDAR

ESA’s Water vapour lidar expt (WALEX) 925nm DIAL

Space-based LIDAR - LITE

Space-based LIDAR - LITE

Space-based LIDAR - LITE Tropical convective mulitlayer cloud systems Saharan dust

Space-based LIDAR - FUTURE