Abstract
Measurements carried out by the Raman lidar system BASIL and the University of Cologne wind lidar are reported to demonstrate the capability of these instruments to characterize water vapour fluxes within the Convective Boundary Layer (CBL). In order to determine the water vapour flux vertical profiles, high resolution water vapour and vertical wind speed measurements, with a temporal resolution of 1 sec and a vertical resolution of 15-90, are considered.Measurements of water vapour flux profiles are based on the application of covariance approach to the water vapour mixing ratio and vertical wind speed time series. The algorithms are applied to a case study (IOP 11, 04 May 2013) from the HD(CP)2 Observational Prototype Experiment (HOPE), held in Central Germany in the spring 2013. For this case study, the water vapour flux profile is characterized by increasing values throughout the CBL with lager values (around 0.1 g/kg m/s) in the entrainment region. The noise errors are demonstrated to be small enough to allow the derivation of water vapour flux profiles with sufficient accuracy.
Highlights
Measurements of water vapour flux profiles provide unique and essential information for the characterization of turbulent processes within the convective boundary layer (CBL)
Measurements carried out by the Raman lidar system BASIL and the University of Cologne wind lidar are reported to demonstrate the capability of these instruments to characterize water vapour fluxes within the Convective Boundary Layer (CBL)
In the present work we report measurements of the water vapour flux profiles within the Convective Boundary Layer (CBL) obtained from the Raman lidar system BASIL and the University of Cologne wind lidar
Summary
Measurements of water vapour flux profiles provide unique and essential information for the characterization of turbulent processes within the convective boundary layer (CBL). Ground-based in situ measurements of water vapour and latent heat fluxes, while being difficult to perform, have a limited significance because they are representative for a given area. Ground-based in situ measurements observe only the lowest part of the CBL and are influenced by local surface properties. Lidar systems, based on their capability to provide high space and time resolution and accurate measurements of atmospheric water vapour and vertical wind speed, have nowadays reached the level of maturity needed to measure vertical profiles of water vapour and latent heat fluxes [2][3][4]. In the present work we report measurements of the water vapour flux profiles within the Convective Boundary Layer (CBL) obtained from the Raman lidar system BASIL and the University of Cologne wind lidar
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