Study of the moist Convective Boundary Layer structure by backscattering lidar

Details Study of the moist Convective Boundary Layer structure by backscattering lidar Study of the moist Convective Boundary Layer structure by backscattering lidar

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994bolme..69....1d&link_type=abstract

Boundary-Layer Meteorology, Volume 69, Issue 1-2, pp. 1-25

Computer Science

11

Scientific paper

Measurements of the structure of the Convective Boundary Layer (CBL) were made from the ground and from the ARAT aircraft with a backscattering lidar during the preliminary phase of the French project LEANDRE. A numerical model of Mie theory diffusion was used to determine a theoretical profile of the extinction coefficient, as a function of relative humidity. Comparisons between theoretical and measured profiles were made. Good agreement was found, which confirms that the variation of the extinction coefficient in the CBL is primarily controlled by the relative humidity. This paper also presents a detailed analysis of the small-scale structure of the CBL. The normalized length and number of thermals are estimated. Results are in agreement with previous in-situ measurements. An analysis of the bidimensional cross-section of the extinction coefficient shows that this coefficient permits one to retrieve more quantitative information than the range-corrected signal, as the fractions of entrained air and surface-layer air at a given altitude.

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