606
the use of SSMjI retrievals for the detection of fronts and other synoptic features in the FROST
project was outlined.
Apart from the monitoring approach desribed above, numerical simulations allow a further examination of the (thermo - ) dynamical processes responsible for their formation. Kopken and
Heinemann presented work in this domain, concentrating on the simulation of polar mesocyclones in the Antarctic. In order to obtain a realistic description of the synoptic environment
and the mesoscale systems, observations are assimilated using a 4-dimensional intermittent
scheme. In a case study, the positive impact of conventional observations and measurement
campaign data was shown and the technique used for assimilating integrated water vapour
content and near-surface windspeeds derived from SSMjI measurements was presented. Due
to the extreme scarcity of conventional observations in this area, these satellite data as well as
TOVS temperature and humidity profiles and ERS-l wind vectors provide an important source
of large scale and mesoscale information. These will be used in further simulation studies.
Remote sensing also has applications to larger, synoptic scale phenomena. Clerk presented
an observational study of an upper-level jet-front system using actual in-situ flight data, as
well as data from the TOVS instrument and ECMWF analyzed fields. The results of the
study indicated that contrary to conventional thinking, water vapour may not be a simple
passive tracer of stratospheric intrusion events associated with such systems. This suggests the
technique of tracing these intrusions by following water-vapour anomalies revealed by satellite
data should be used cautiously.
Clerk A Department of Physics, University of Toronto, Canada
Stratospheric intrusion associated with a jet front system
Csiszar I Hungarian Meteorological Service, Satellite Research Laboratory, Budapest, Hungary
Use of AVHRR data in the TOVS cloud clearing process
Kerschgens M, Jasbinschek D, Mole FJ Meteorological and Geophysical Institute, University of Cologne, Germany
Windfield measurements with a REMTECH phased array (PA-2) Doppler Sodar
Klein Baltink H Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
Tropospheric Energy Budget Experiment: TEBEX
Kopken Ch, Heinemann G Meteorological Institute, University of Bonn, Germany
Assimilation of satellite data into a mesoscale model for polar low studies
Lieder M, Heinemann G Meteorological Institute, University of Bonn, Germany Remote
sensing of polar mesocylones with passive microwave radiometry
6 Group F: Earth System Modelling/Validation
Modelling the climate and Earth System is a very complex task. Processes, surfaces and
interfaces in nature have, in general, complicated morphologies, often exhibit statistical selfaffine properties and are characterized by finite-domain power-law power spectra. lvanova et
al. have developed an approximate self-affine model which has been applied to rough metal
deposits and provided their reasonably accurate description. This implies that the model might
also prove useful for characterization of the interfaces and processes in the atmosphere.
A simulation of the end-Cretaceous (65 Myr. ago) climate is carried out by Pierazzo using
the latest version of the NCAR General Circulation Model (GCM) CCM2, with input data
set relative to the end-Cretaceous paleogeography and topography, sea surface temperature,
vegetation, and CO2 content. Preliminary results indicate a more equable climate, with a
the use of SSMjI retrievals for the detection of fronts and other synoptic features in the FROST
project was outlined.
Apart from the monitoring approach desribed above, numerical simulations allow a further examination of the (thermo - ) dynamical processes responsible for their formation. Kopken and
Heinemann presented work in this domain, concentrating on the simulation of polar mesocyclones in the Antarctic. In order to obtain a realistic description of the synoptic environment
and the mesoscale systems, observations are assimilated using a 4-dimensional intermittent
scheme. In a case study, the positive impact of conventional observations and measurement
campaign data was shown and the technique used for assimilating integrated water vapour
content and near-surface windspeeds derived from SSMjI measurements was presented. Due
to the extreme scarcity of conventional observations in this area, these satellite data as well as
TOVS temperature and humidity profiles and ERS-l wind vectors provide an important source
of large scale and mesoscale information. These will be used in further simulation studies.
Remote sensing also has applications to larger, synoptic scale phenomena. Clerk presented
an observational study of an upper-level jet-front system using actual in-situ flight data, as
well as data from the TOVS instrument and ECMWF analyzed fields. The results of the
study indicated that contrary to conventional thinking, water vapour may not be a simple
passive tracer of stratospheric intrusion events associated with such systems. This suggests the
technique of tracing these intrusions by following water-vapour anomalies revealed by satellite
data should be used cautiously.
Clerk A Department of Physics, University of Toronto, Canada
Stratospheric intrusion associated with a jet front system
Csiszar I Hungarian Meteorological Service, Satellite Research Laboratory, Budapest, Hungary
Use of AVHRR data in the TOVS cloud clearing process
Kerschgens M, Jasbinschek D, Mole FJ Meteorological and Geophysical Institute, University of Cologne, Germany
Windfield measurements with a REMTECH phased array (PA-2) Doppler Sodar
Klein Baltink H Royal Netherlands Meteorological Institute, De Bilt, the Netherlands
Tropospheric Energy Budget Experiment: TEBEX
Kopken Ch, Heinemann G Meteorological Institute, University of Bonn, Germany
Assimilation of satellite data into a mesoscale model for polar low studies
Lieder M, Heinemann G Meteorological Institute, University of Bonn, Germany Remote
sensing of polar mesocylones with passive microwave radiometry
6 Group F: Earth System Modelling/Validation
Modelling the climate and Earth System is a very complex task. Processes, surfaces and
interfaces in nature have, in general, complicated morphologies, often exhibit statistical selfaffine properties and are characterized by finite-domain power-law power spectra. lvanova et
al. have developed an approximate self-affine model which has been applied to rough metal
deposits and provided their reasonably accurate description. This implies that the model might
also prove useful for characterization of the interfaces and processes in the atmosphere.
A simulation of the end-Cretaceous (65 Myr. ago) climate is carried out by Pierazzo using
the latest version of the NCAR General Circulation Model (GCM) CCM2, with input data
set relative to the end-Cretaceous paleogeography and topography, sea surface temperature,
vegetation, and CO2 content. Preliminary results indicate a more equable climate, with a