WMOD00509

• Title: Physics of Winter Orographic Precipitation and it's Modification - Summary of Presentations
• Date: 10/1/1985
• Weather Modification - Doc Type: Report

RECENT RESULTS OF THE COLORADO STATE UNIVERSITY
COLORADO OROGRAPHIC SEEDING EXPERIMENT (COSE)

Robert M. Rauber and Lewis O. Grant

The session was opened by Professor Grant. He reviewed the goals

and scope of the COSE research program and put them in historical

perspective by presenting material from previous CSU research programs.

The CSU group then presented a summary of various research activities

associated with the COSE program. Table 1 is an outline of the CSU

research activities and of the topics addressed at the workshop.

Bob Rauber discussed observation techniques used during COSE,

including the instrumentation layout, aircraft sampling procedures,

surface ice particle measurements and the use of satellite data in

forecasting. Analysis of instrumentation including recent radiometer

comparisons were discussed. The modeling ,efforts of the CSU group were

reviewed. These include work with simple 2-D crystal trajectory studies

as well as more complex 2-D simulations wih the CSU Regional Atmospheric

Modeling System (RAMS). Paul DeMott reviewed recent CSU laboratory

work, emphasizing the interaction between laboratory results, modeling,

and the atmosphere. Recent results from the CSU dynamic expansion

chamber were reviewed. Randy Borys discussed the CSU Storm Peak

Laboratory program. Storm Peak Laboratory is located at the crest of

the Park Range. Atmospheric chemistry studies were reviewed as well as

,
tracer studies. Professor Grant concluded this section by presenting

CSU studies of airflow, transport and dispersion, and valley inversions.

The majority of the presentation was dedicated to discussion of

physical and microphysical structure of Park Range cloud systems.

Bob Rauber presented the results of studies of the temporal

evolution of cloud systems in pre-frontal, post-frontal, and orographic

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