600
In the poster by Tolton and Drummond a new form of correlation radiometer known as
a length modulated radiometer (LMR) is presented. The technique of correlation radiometry
has been used in satellite-based measurements of atmospheric temperature and composition for
over two decades. The LMR will be an integral component of the satellite instrument known
as MOPITT (Measurements Of Pollution In The Troposphere), which has been selected to be
launched on the EOS-AMI platform of the Earth Observing System in 1998. The primary
objective of MOPITT will be to enhance our knowledge of the lower atmosphere by measuring
atmospheric profiles of CO and CH4 •
The development of the LMR for MOPITT has led to the building of a ground-based solar
absorption instrument for measuring atmospheric columns of CO. This is the first remote
sounding instrument to utilise a LMR. A short decription of the LMR technique and a summary
of the sources of imbalance in the current design of the LMR (Mk III) is provided. The results
of a measurments campaign in the Toronto region in the late summer of 1994 is presented.
Bartsch B Meteorologisches Institut, Universitat Hamburg, Germany
Bakan S Max-Planck-Institut fiir Meteorologie, Hamburg, Germany
Fischer J Institut fiir Weltraumwissenschaften, Freie Universitat Berlin, Germany
Water vapour detection above land surface using backscattered solar radiation.
Serwazi M, Reichardt J, Weitkamp C GKSS Forschungszentrum Geesthacht GmbH, Postfach 1160, D-21494 Geesthacht, Germany
Wandlinger U, Ansmann A IfT-Institut fiir Atmospharenforschung, Permoserstrasse 15,
D-04303 Leipzig, Germany
Water vapour profiling using the Raman !idar techniques
Tolton BT, Drummond JR Department of Physics, University of Toronto, Toronto, Ontario,
Canada
Ground based measurements of atmospheric CO using length modulated radiometer
2 Group B: Cloud-Radiative Modelling / Parameterizations
Gaining a clear understanding of the physical processes that occur in the earths atmosphere
due to the presence of condensed water is a fundamental goal of many aspects of atmospheric
research. While clouds represent an important link in the earths hydrologic cycle, they also
impact other facets of human activity. This is demonstrated by Seker who considers the propagation of microwave radio signals in a cloudy atmosphere. He finds that mixed phase clouds
can significantly impact radio communication both by attenuation and phase shifting of the
transmitted signal using his stochastic multi-component propagation model of clouds. Clouds
are also an important regulator of the earths climate. The coupling of clouds with the climate
system stems from the well known effect of clouds to increase the planetary albedo leading
to a net decrease in the globally averaged downward solar flux while simultaneously warming
the earth system by decreasing the upward-directed top of atmosphere (TOA) terrestrial flux.
Because the interaction of clouds with solar and terrestrial radiatiation is poorly characterized
in models of the earths climate, climate change predictions from General Circulation Models
(GCMs) are somewhat ambiguous. Before general circulation models (GCMs) can realistically
predict changes in the climate due to anthropogenic modification of radiatively active trace
gases, the nonlinear feedback mechanisms induced by clouds must be sucessfully parameterized
in these models. The complexity of this problem is illustrated by Mace and Ackerman who,
using data, show that the decrease in surface insolation can vary naturally from 10% to more
In the poster by Tolton and Drummond a new form of correlation radiometer known as
a length modulated radiometer (LMR) is presented. The technique of correlation radiometry
has been used in satellite-based measurements of atmospheric temperature and composition for
over two decades. The LMR will be an integral component of the satellite instrument known
as MOPITT (Measurements Of Pollution In The Troposphere), which has been selected to be
launched on the EOS-AMI platform of the Earth Observing System in 1998. The primary
objective of MOPITT will be to enhance our knowledge of the lower atmosphere by measuring
atmospheric profiles of CO and CH4 •
The development of the LMR for MOPITT has led to the building of a ground-based solar
absorption instrument for measuring atmospheric columns of CO. This is the first remote
sounding instrument to utilise a LMR. A short decription of the LMR technique and a summary
of the sources of imbalance in the current design of the LMR (Mk III) is provided. The results
of a measurments campaign in the Toronto region in the late summer of 1994 is presented.
Bartsch B Meteorologisches Institut, Universitat Hamburg, Germany
Bakan S Max-Planck-Institut fiir Meteorologie, Hamburg, Germany
Fischer J Institut fiir Weltraumwissenschaften, Freie Universitat Berlin, Germany
Water vapour detection above land surface using backscattered solar radiation.
Serwazi M, Reichardt J, Weitkamp C GKSS Forschungszentrum Geesthacht GmbH, Postfach 1160, D-21494 Geesthacht, Germany
Wandlinger U, Ansmann A IfT-Institut fiir Atmospharenforschung, Permoserstrasse 15,
D-04303 Leipzig, Germany
Water vapour profiling using the Raman !idar techniques
Tolton BT, Drummond JR Department of Physics, University of Toronto, Toronto, Ontario,
Canada
Ground based measurements of atmospheric CO using length modulated radiometer
2 Group B: Cloud-Radiative Modelling / Parameterizations
Gaining a clear understanding of the physical processes that occur in the earths atmosphere
due to the presence of condensed water is a fundamental goal of many aspects of atmospheric
research. While clouds represent an important link in the earths hydrologic cycle, they also
impact other facets of human activity. This is demonstrated by Seker who considers the propagation of microwave radio signals in a cloudy atmosphere. He finds that mixed phase clouds
can significantly impact radio communication both by attenuation and phase shifting of the
transmitted signal using his stochastic multi-component propagation model of clouds. Clouds
are also an important regulator of the earths climate. The coupling of clouds with the climate
system stems from the well known effect of clouds to increase the planetary albedo leading
to a net decrease in the globally averaged downward solar flux while simultaneously warming
the earth system by decreasing the upward-directed top of atmosphere (TOA) terrestrial flux.
Because the interaction of clouds with solar and terrestrial radiatiation is poorly characterized
in models of the earths climate, climate change predictions from General Circulation Models
(GCMs) are somewhat ambiguous. Before general circulation models (GCMs) can realistically
predict changes in the climate due to anthropogenic modification of radiatively active trace
gases, the nonlinear feedback mechanisms induced by clouds must be sucessfully parameterized
in these models. The complexity of this problem is illustrated by Mace and Ackerman who,
using data, show that the decrease in surface insolation can vary naturally from 10% to more