Poster Summaries
605
Modelling soil-vegetation-atmosphere transfer processes and their influence on mesoscale atmospheric circulations
de Rosnay P, Polcher J Laboratorie Meteorologie dynamique, LMD, CNRS, Paris, France
A parameterization of subgrid-scale variability of hydrology linked to vegetation
Thonfeld H, v.Schonermark M, Tornow C, Weimann A, Vogt P, Witt H DLR, Berlin,
Germany
A simulation scheme for testing relationships between vegetation index and surface radiometric
temperature to estimate surface soil moisture
5 Group E: Applications to Dynamical-Thermodynamical Processes
Remote sensing offers many possibilities in increasing our understanding of dynamical and
thermodynamical processes in the atmosphere. Opportunities exist on a wide variety of scales,
ranging from the synoptic to the mesoscale, and also including the turbulent scales in the
atmospheric boundary layer (ABL).
Klein Baltink presented a poster on recent developments in ground-based remote sensing
techniques. These allow continuous, unmanned measurement of vertical profiles of wind and
temperature using a windprofiler/RASS. For studying boundary layer processes in order to
improve parametrizations this system offers data of high temporal and spatial resolution, of
which some examples were presented. The data are collected within the framework of the
TEBEX project which addresses the problem of parameterization of sub-grid scale processes
above land in climate models.
Descriptions of the stability conditions in the ABL are also of increasing importance to climate
studies and scientific studies of local thermal and orographic produced wind-systems. To study
such systems, Kerschgens et aI. worked with a Phased Array Doppler SODAR. He presented
in his poster results of an intercomparison of SODAR and tower measurements at two different
heights, as well as of a comparison between horizontal windspeed measured with SODAR and
computed by a prognostic windfield model.
The complexity of the retrieval of geophysical parameters from space often makes it necessary to
use simultaneous remote sensing systems working in different spectral regions and at different
spatial scales. For instance, more accurate information on cloudiness derived from AVHRR
may improve the quality of the TOVS temperature and humidity retrieval products. Csiszar
presented a poster in which the mean fractional cloud cover, cloud top temperature, cloud
emissivity and droplet size of semi-transparent single-layered clouds for the HIRS spots were
derived from collocated AVHRR data. The information on droplet size was used to derive the
cloud emissivities at the HIRS wavelengths from pre-calculated emissivity look-up tables.
Lieder and Heinemann presented in their poster the use of passive microwave remote sensing
in polar regions. He showed the need for additional, remotely sensed meteorological information
in data-scarce areas for monitoring synoptic as well as.meso-scale systems. For a case study of
a polar low in the Antarctic region he examined the fields of SSM/I-retrieved integrated water
vapour, cloud liquid water path, surface wind speed and rain rates. Presenting corresponding
ECMWF model analyses for a comparison, he showed that the mesocyclone is not analyzed by
the model. Already on the synoptic scale numerical weather prediction models have difficulties
describing the antarctic meteorology. An international project addressing this problem was
described (FROST, First Regional Observing Study of the Troposphere in the Antarctic) and
605
Modelling soil-vegetation-atmosphere transfer processes and their influence on mesoscale atmospheric circulations
de Rosnay P, Polcher J Laboratorie Meteorologie dynamique, LMD, CNRS, Paris, France
A parameterization of subgrid-scale variability of hydrology linked to vegetation
Thonfeld H, v.Schonermark M, Tornow C, Weimann A, Vogt P, Witt H DLR, Berlin,
Germany
A simulation scheme for testing relationships between vegetation index and surface radiometric
temperature to estimate surface soil moisture
5 Group E: Applications to Dynamical-Thermodynamical Processes
Remote sensing offers many possibilities in increasing our understanding of dynamical and
thermodynamical processes in the atmosphere. Opportunities exist on a wide variety of scales,
ranging from the synoptic to the mesoscale, and also including the turbulent scales in the
atmospheric boundary layer (ABL).
Klein Baltink presented a poster on recent developments in ground-based remote sensing
techniques. These allow continuous, unmanned measurement of vertical profiles of wind and
temperature using a windprofiler/RASS. For studying boundary layer processes in order to
improve parametrizations this system offers data of high temporal and spatial resolution, of
which some examples were presented. The data are collected within the framework of the
TEBEX project which addresses the problem of parameterization of sub-grid scale processes
above land in climate models.
Descriptions of the stability conditions in the ABL are also of increasing importance to climate
studies and scientific studies of local thermal and orographic produced wind-systems. To study
such systems, Kerschgens et aI. worked with a Phased Array Doppler SODAR. He presented
in his poster results of an intercomparison of SODAR and tower measurements at two different
heights, as well as of a comparison between horizontal windspeed measured with SODAR and
computed by a prognostic windfield model.
The complexity of the retrieval of geophysical parameters from space often makes it necessary to
use simultaneous remote sensing systems working in different spectral regions and at different
spatial scales. For instance, more accurate information on cloudiness derived from AVHRR
may improve the quality of the TOVS temperature and humidity retrieval products. Csiszar
presented a poster in which the mean fractional cloud cover, cloud top temperature, cloud
emissivity and droplet size of semi-transparent single-layered clouds for the HIRS spots were
derived from collocated AVHRR data. The information on droplet size was used to derive the
cloud emissivities at the HIRS wavelengths from pre-calculated emissivity look-up tables.
Lieder and Heinemann presented in their poster the use of passive microwave remote sensing
in polar regions. He showed the need for additional, remotely sensed meteorological information
in data-scarce areas for monitoring synoptic as well as.meso-scale systems. For a case study of
a polar low in the Antarctic region he examined the fields of SSM/I-retrieved integrated water
vapour, cloud liquid water path, surface wind speed and rain rates. Presenting corresponding
ECMWF model analyses for a comparison, he showed that the mesocyclone is not analyzed by
the model. Already on the synoptic scale numerical weather prediction models have difficulties
describing the antarctic meteorology. An international project addressing this problem was
described (FROST, First Regional Observing Study of the Troposphere in the Antarctic) and