604
4 Group D: Surface Processes
Participants of that group examine different land surface types and processes using various
techniques. The first group of posters are related to the computation of the turbulent fluxes of
sensible heat, water vapour and momentum at the land surfaces (SVAT- models). The LMD
GCM contains a complex land surface scheme, SECHIBA, which explicitly takes into account
the sub-grid scale variability of vegetation. The study of de Rosnay and Polcher shows the
impact of the introduction of subgrid scale variability of the soil hydrology on the surface fluxes
computed by SECHIBA.
The next poster presents a SVAT scheme, extended by a long- and a short wave radiative
transfer model, which will be used to simulate the dependency between the radiometric surface
temperature and NDVI. This dependency represents an approach to infer the regional scale
surface soil moisture (Thonfeid et aI.). There was also a presentation of the main processes
represented in the UCL/SVAT model, as well as a few validation results. This model is now a
part of a mesoscale atmospheric model (UCL/MAR) and will be used to study the influence of
the land surface on mesoscale circulations (de Ridder and Schayes).
Further posters present results from experiments. The analysis of aircraft boundary layer flux
measurements from NOPEX 1994 over a heterogeneous land surface show that surface induced
mesoscale scale divergences cannot be neglected in the boundary layer moisture budget on a
regional scale (Frech et aI.) The mesoscale fluxes are organized into fairly stationary patterns
along the analysed flight legs. Measurements from ground by simultaneous use of different
remote sensing techniques are presented by Abbate, namely: kinematic eddy sensible heat
flux by Doppler SODAR and cryogenic radiometer, characteristics of sea breeze circulation
and PBL structure by a network of Doppler SODARs, kinematic water vapour flux and latent
heat by Doppler SODAR and Raman LIDAR. Results are in accordance with values obtained
during other experiments. KowaIewska et aI. have analysed and compared Landsat TM
(band 1-4) optical and ERS-1 SAR radar data to obtain the surface details of the urban and
countryside areas of Rome. Preliminary classification of water, urban and various vegetated
areas has been shown. Vegetation pattern in the urban and countryside areas at Northeastern
Blacksea Region in Turkey using NOAA AVHRR data recorded in 24 April 1995 are presented
in poster by Okcu et aI. The time series of temperature, relative humidity and pressure for
long term data at each stations have been analysed by using Fourier Analysis to study how the
vegetation pattern affects the climatology of the region.
Abbate G ENEA - Ambiente, Rome, Italy
Lower atmosphere study of urban areas by means of remote sensing techniques: observations
and measurements in the area of Rome
Frech M, Jochum AM DLR, Oberpfaffenhofen, Germany
Samueisson P, Bergstrom H Uppsala University, Sweden. A first step towards aggregating
energy fluxes over the NOPEX area
Kowalewska H Institute of Marine Sciences, University of Szczecin, Szczecin, Poland
Abbate G, Borfecchia F ENEA, Rome, Italy
Land cover characteristics of Roman urban area and its countryside from Landsat TM and
ERS- 1 SAR data
Okcu D, Sogiit AS Bogazici University, Meteorology Laboratory, Istanbul, Turkey
AsIan Z Kafkas University, Faculty of Forestry, Artvin, Turkey
Thermal and vegetation map of Northeastern Blacksea Region in Turkey
de Ridder K, Schayes G Institut d'Astronomie et de Geophysique, Louvain-la-Neuve, Belgium
4 Group D: Surface Processes
Participants of that group examine different land surface types and processes using various
techniques. The first group of posters are related to the computation of the turbulent fluxes of
sensible heat, water vapour and momentum at the land surfaces (SVAT- models). The LMD
GCM contains a complex land surface scheme, SECHIBA, which explicitly takes into account
the sub-grid scale variability of vegetation. The study of de Rosnay and Polcher shows the
impact of the introduction of subgrid scale variability of the soil hydrology on the surface fluxes
computed by SECHIBA.
The next poster presents a SVAT scheme, extended by a long- and a short wave radiative
transfer model, which will be used to simulate the dependency between the radiometric surface
temperature and NDVI. This dependency represents an approach to infer the regional scale
surface soil moisture (Thonfeid et aI.). There was also a presentation of the main processes
represented in the UCL/SVAT model, as well as a few validation results. This model is now a
part of a mesoscale atmospheric model (UCL/MAR) and will be used to study the influence of
the land surface on mesoscale circulations (de Ridder and Schayes).
Further posters present results from experiments. The analysis of aircraft boundary layer flux
measurements from NOPEX 1994 over a heterogeneous land surface show that surface induced
mesoscale scale divergences cannot be neglected in the boundary layer moisture budget on a
regional scale (Frech et aI.) The mesoscale fluxes are organized into fairly stationary patterns
along the analysed flight legs. Measurements from ground by simultaneous use of different
remote sensing techniques are presented by Abbate, namely: kinematic eddy sensible heat
flux by Doppler SODAR and cryogenic radiometer, characteristics of sea breeze circulation
and PBL structure by a network of Doppler SODARs, kinematic water vapour flux and latent
heat by Doppler SODAR and Raman LIDAR. Results are in accordance with values obtained
during other experiments. KowaIewska et aI. have analysed and compared Landsat TM
(band 1-4) optical and ERS-1 SAR radar data to obtain the surface details of the urban and
countryside areas of Rome. Preliminary classification of water, urban and various vegetated
areas has been shown. Vegetation pattern in the urban and countryside areas at Northeastern
Blacksea Region in Turkey using NOAA AVHRR data recorded in 24 April 1995 are presented
in poster by Okcu et aI. The time series of temperature, relative humidity and pressure for
long term data at each stations have been analysed by using Fourier Analysis to study how the
vegetation pattern affects the climatology of the region.
Abbate G ENEA - Ambiente, Rome, Italy
Lower atmosphere study of urban areas by means of remote sensing techniques: observations
and measurements in the area of Rome
Frech M, Jochum AM DLR, Oberpfaffenhofen, Germany
Samueisson P, Bergstrom H Uppsala University, Sweden. A first step towards aggregating
energy fluxes over the NOPEX area
Kowalewska H Institute of Marine Sciences, University of Szczecin, Szczecin, Poland
Abbate G, Borfecchia F ENEA, Rome, Italy
Land cover characteristics of Roman urban area and its countryside from Landsat TM and
ERS- 1 SAR data
Okcu D, Sogiit AS Bogazici University, Meteorology Laboratory, Istanbul, Turkey
AsIan Z Kafkas University, Faculty of Forestry, Artvin, Turkey
Thermal and vegetation map of Northeastern Blacksea Region in Turkey
de Ridder K, Schayes G Institut d'Astronomie et de Geophysique, Louvain-la-Neuve, Belgium