Skip to main content

PARAMETERIZATION OF LAND SURFACE FLUXES FOR CLIMATE MODELLING

Objective

A BETTER UNDERSTANDING OF THE PHYSICAL PROCESSES YIELDING THE HEAT FLUXES OBSERVED OVER HETEROGENEOUS MEDIA AND THEREFORE TO A BETTER PARAMETRIZATION OF THESE FLUXES AT MESO-SCALE, INCLUDING IF POSSIBLE PARAMETERS MEASURABLE FROM SATELLITES.
THE DERIVATION AND IMPROVEMENT OF WELL VALIDATED METHODS OF MEASUREMENT OF THESE FLUXES AT THE APPROPRIATE SCALES.

EXPERIMENTS WILL BE PERFORMED IN ORDER :

I.TO MEASURE RADIANCE, HEAT, WATER AND MOMENTUM FLUXES OVER DIFFERENT SURFACE TYPES;
II.TO RELATE LOCAL MEASUREMENTS (REPRESENTATIVE OF SMALL PLOTS) TO NON-LOCAL MEASUREMENTS, SUCH A EDDY CORRELATION MEASURED BY AIRCRAFT OR RADIANCE FLUXES MEASURED BY SATELLITES, AND
III.TO CHARACTERISE THE SRUCTURE OF THE LAND SURFACE IN SIMPLE, QUANTITATIVE TERMS, SUCH AS DENSITY AND HEIFGT OG VEGETATION, ROUGHNESS LENGTH, SURFACE SLOPE AND EXPOSURE.

THE DUTCH CONTRIBUTION CONSISTS OF
A.PARTICIPATION TO THE JOINT FIELD EXPERIMENT IN CRAU, FRANCE, IN JUNE 1987,
B.PROCESSING THE COLLECTED DATA; BRINGING THESE ON MAGNETIC TAPES IN A STANDARD FORMAT,
C.VERIFICATION OF (EXISTING) METHODS.
FOR THE FIRST TWO YEARS WE WILL CONFINE OURSELVES TO IRREGULARITIES AT THE SURFACE WHICH ARE SO SMALL (10-1000M.) THAT THESE DO NOT EFFECT THE DYNAMICS OF THE PLANETARY BOUNDARY LAYER (PLB). IN A LATER STAGE, THE DUTCH GROUP WILL CONTRIBUTE ALSO TO THE PROBLEM OF NON-UNIFORM TERRAIN WITH IRREGULARITIES ON A LARGER SCALE (BUT SMALLER THAN 100 KM.) THAT INFLUENCE THE DYNAMICS OF THE PBL.FOR THIS MODELS, E.G. A LARGE-EDDY PBL MODEL, ARE AVAILABLE.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

LANDBOUWUNIVERSITEIT WAGENINGEN
Address
Postbus 9101 Salverdaplein, 10
6700 HB Wageningen
Netherlands

Participants (4)

ARISTOTELIAN UNIV DEPT OF BIOLOGY
GROUPEMENT SCIENTIFIQUE DE TELEDETECTION
INST F METEOROLOGIE
INSTITUTE OF GEOGRAPHY