Clouds - Their Prediction and Simulation
Annual rept. 1 Jun 1991-31 Dec 1991,
COLORADO STATE UNIV FORT COLLINS DEPT OF ATMOSPHERIC SCIENCE
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Piotr Flatau has nearly completed a new comprehensive two-stream radiative transfer RT code which includes cloud water and ice scattering properties. The code is interfaced to the RAMS bulk cloud microphysics module. Several algorithmic improvements have been made to all three major components of the RT package molecular gases, single scattering properties of clouds, and radiative transfer solver. Reduction and elimination algorithms for the RT solver have been developed. The code has been efficiently written to take advantage of vectorization and parallelization issues. New interfaces to LOWTRAN7 and MODTRAN are also provided. Single scattering properties are included using the anomalous diffraction theory ADT. A number of members of our research group participated in the FIRE IT Cirrus field experiment in Coffeyville, Kansas November 12-December 12. This was an extremely successful mission. RAMS was used in a forecasting mode, and data were gathered for future cases studies including data specially tailored for mesoscale modeling during the Intensive Observing Period. We gathered MAPS and NGM data for all the days of the project, collected satellite pictures, and relevant meteorological information. Piotr Flatau and Graeme Stephens also served as mission planning scientists for the NCAR Saberliner aircraft.