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Echival field experiment in a desertification threatenend area

Objetivo

The main goal is to provide for "Global Change" studies and global system modelling
a) the necessary area-average parametrizations of the water and energy transfer between soils, vegetation and the atmosphere, as well as
b) data sets,
(i) against which models can be tested that describe these processes, and
(ii) which are relevant for the documentation of changes in these processes due to climate variability andor the impact of man's activity.

The general setup foresees three sites arranged nearly triangularly at a distance of about 100 km and at each site there will be a couple of stations arranged around one central station to achieve the nested higher resolution of one to two kilometers.
During a period of about 10 days it is expected that up to four aircraft will measure atmospheric parameters and remote sensing data above the whole plain. The aircraft equipped with eddy-correlation instruments for flux measurements have to play the integrating role for the experimental area. Supported by frequent radiosonde ascents at different locations near the experimental area it should be possible to derive from these measurements also the advective fluxes, which may play an important role under dry conditions. These may result from large scale circulation including the intrusion of Mediterranean air masses from the south-east and Atlantic air masses from the west into a continental heat low.
Satellite data will be used to measure the albedo of the surface as well as the diurnal temperature wave and its changes with the retreat of the vegetation during the drying season.
The role of the vegetation in the exchange of water between soils and the atmosphere will be assessed by random sampling surveys on leaf-areaindex, PAR, spectral reflectance, stomata resistance and biomass production. It is further planned to analyse soil samples with respect to their physical properties and to determine the soil moisture content by different methods.
To validate the data obtained from satellites and the methods used in the processing of these data, mobile measurements are foreseen.
The experimental results which will finally be obtained have to be imbedded in climatological and meteorological background data for the Iberian peninsula in order to find out to what degree the experimental phase covers average or extraordinary climatological conditions.
The experiment will be accompanied by modelling efforts at different scales, ranging from one dimensional SVAT models to three dimensional general circulation models.

Ámbito científico

Programa(s)

Tema(s)

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Convocatoria de propuestas

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Régimen de financiación

CSC - Cost-sharing contracts

Coordinador

FREIE UNIVERSITAET BERLIN
Aportación de la UE
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Dirección
Carl-Heinrich-Becker-Weg 6-10
12165 BERLIN
Alemania

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Coste total
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Última actualización: 3 Febrero 1997

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Permalink: https://cordis.europa.eu/project/id/EPOC0030/es

European Union, 2024