EOL Seminar: PBL Studies with Lidar Synergy

Date: 
Tuesday, August 20, 2019 - 15:30 to 16:30
Location: 
FL2-1022
Contact Name: 
Melissa Ward
Contact Email: 
Contact Phone: 
(303) 497-8713

Dr. Volker Wulfmeyer

University of Hohenheim - Stuttgart, Germany

Recently, temperature, water-vapor, and wind lidar systems became available with turbulence resolution. Particularly, a new combined water-vapor and temperature Raman lidar (WVTRL) is available that measures water-vapor and temperature profiles down to resolutions of 10 s and 7.5 m during daytime and nighttime.

Several applications of these systems are introduced and discussed, which are particularly powerful if thermodynamic and dynamic profiles are observed simultaneously. These cover observations of mean profiles, gradient profiles, and profiles of higher-order turbulent moments of water-vapor and temperature, sensible and latent heat fluxes, dissipation rates, and the molecular destruction of moisture and temperature variances.

Four applications are presented: 1) The measurement of profiles and time-height cross sections turbulent quantities and fluxes for budget analyses, 2) the derivation of flux-gradient relationships in the interfacial layer at the PBL top for the development of turbulence parameterizations, 3) the study of surface layer profiles using lidar scans for tests of MOST, 4) and the assimilation of temperature and water-vapor profiles in mesoscale models using ensemble-based data assimilation techniques. The future potential of these measurements provided by observatories and ground-based networks is discussed.