Interaction between atmosphere and natural land surface
Prof. Gennady N. PANIN (1)
(1) Head of Lab. Humidity Transfer and Evaporation (LHTE)
Interaction between atmosphere and natural land surface
(on the Cabauw station)
Panin G.N. Institute of Water Problems, RAS (WPI), 117971-Moscow, Gubkin str. 3, Russia.
Kohsiek W., Royal Netherlands Meteorological Institute (KNMI), P.O. Box 201, 3730 AE De Bilt, The Netherlands.
In line with earlier observations the 17568 Cabauw data show imbalances of the energy budget during daytime conditions. The outcomes of measurements of all components of the equation of balance of heat, averaged over 1/2 hour periods, are shown that, within the framework of the used measuring techniques, the heat balance is not closed. The sum of flows of heat which is going into the atmosphere is less than .
The main cause of this systematic imbalance is not the experimental methodology but a conceptual deficiency. It is related to the fact that the energy-mass exchange between the complex (horizontally inhomogeneous) land surface and the atmosphere is determined by applying theories that are based on the hypothesis of stationary and horizontal homogeneity (SHH).
Using the experimental results of the Cabauw station, it was detected that the underestimation of the turbulent fluxes and the terrain inhomogeneity are related. To systematize the correction for this effect a parameterization is suggested which empirically makes use of the involved inhomogenity scale in the environment of a site. This parameterization incorporates seasonal and wind direction effects.
There is an ongoing discussion on how to account for different types and scales of land surface inhomogeneities inside cells of models such as global climate models, as well as mesoscale models.
Submittal Information
Name :
Date :
Prof. Gennady N. PANIN
09-May-01-10:57:43
Organization :
Theme :
Head of Lab. Humidity Transfer and Evaporation (LHTE)
Theme 3
Address :
Presentation :
Institute of Water Problems, 117971-Moscow, Gubkin str.3, Russia
