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          Institute: MPI für Meteorologie     Collection: Land in the Earth System     Display Documents

ID: 557689.0, MPI für Meteorologie / Land in the Earth System
Determination of the convective boundar-layer height with Laser remote sensing
Authors:Lammert, A.; Boesenberg, J.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Boundary-Layer Meteorology
Start Page:159
End Page:170
Review Status:not specified
Audience:Not Specified
Abstract / Description:Different methods to determine the height of the convective boundary layer from lidar measurements are described and compared. The differences in either aerosol backscatter or in humidity between the boundary layer and the free troposphere are used, and either the variance or the gradient profile of the parameter under study is evaluated. On average the different methods are in very good agreement. Temporal resolution of the gradient method is very high, on the order of seconds, but often there is an ambiguity in the choice of the “relevant” minimum in the gradient that corresponds to the boundary-layer height. This is avoided by combining the variance and the gradient methods, using the result of the variance analysis as an indicator for the region where the minimum of the gradient is sought. The combined method is useful for automated determination of the boundary-layer height at least under convective conditions. Aerosol backscatter is found to be as good an indicator for boundary-layer air as humidity, so a relatively simple backscatter lidar is sufficient for determination of the boundary-layer height.
Free Keywords:Absolute humidity, DIAL, Lidar, Mixing height
External Publication Status:published
Document Type:Article
Communicated by:Kauhs
Affiliations:MPI für Meteorologie/Land in the Earth System (2005-)
External Affiliations:GKSS Forschungszentrum, Geesthacht
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