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August 1997

Science Briefing

NCAR researchers Andy Heymsfield (MMM) and Sasha Madronich (ACD) were appointed to the post of senior scientist by the UCAR Board of Trustees in its July meeting. Chosen from within NCAR to provide the center with long-term scientific leadership, senior scientists are selected on the basis of individual competence in research and in other activities that enhance NCAR's interaction with scientists elsewhere. The position is analogous to that of full professor at a tenure-granting university.

Andy Heymsfield
Currently in MMM's Physical Meteorology Group, Andy has worked on a range of problems related to cloud microphysics, with a focus on ice clouds, especially cirrus and anvils associated with cumulonimbi. He was a principal investigator in several related field programs, including NASA's First ISCCP (International Satellite Cloud Climatology Project) Field Experiments I and II. Andy has studied tropical cirrus since 1973 and, since becoming an associate of the Scripps Institution of Oceanography's Center for Clouds, Chemistry and Climate in 1992, he has collaborated with Veerabhadran Ramanathan and others at Scripps on the Central Equatorial Pacific Experiment. He has also been involved in several mountain wave-cloud studies over the Front Range and recently participated in the Subsonic Aircraft: Contrail and Cloud Effects Special Study field program, studying contrail microphysics.

From 1988 to 1996, Andy served on the International Commission on Cloud Physics of the International Association of Meteorology and Atmospheric Physics. He was chair of the American Meteorological Society Committee on Cloud Physics from 1985 to 1987. Andy has been an associate editor of Atmospheric Environment since 1988 and held the same post for the Journal of the Atmospheric Sciences from 1987 to 1994. His technical accomplishments include development of a balloon-borne ice particle replicator and an airborne video ice particle sampler.

Andy joined NCAR in 1975 after two years at Meteorology Research, Inc. He received a bachelor's degree in physics at the State University of New York at Fredonia, followed by master's and doctoral degrees in meteorology at the University of Chicago.

Sasha Madronich
Sasha is the head of ACD's Theoretical Studies and Modeling Section and the leader of ACD's Regional Studies and Processes Project. His research has focused on ozone and oxidation processes in the troposphere. Sasha and his colleagues have developed a hierarchy of models to study oxidation, ranging from box models with highly detailed chemistry to a regional model that incorporates episodic meteorology. Sasha's recent work also includes an assessment of the impact of stratospheric ozone changes on ultraviolet radiation and the resulting incidence of skin cancer.

Active in several programs to evaluate and monitor ultraviolet radiation and ozone depletion, Sasha serves on standing committees of the World Meteorological Organization, the United Nations Environment Programme, the U.S. Departments of Agriculture and Energy, and the Environmental Protection Agency. He is a member of NCAR's Geophysical Turbulence Program and a science research mentor in the Significant Opportunities in Atmospheric Research and Science (SOARS) program.

Sasha has been at NCAR since 1985, with the exception of a year spent as a senior research associate at SUNY-Albany (1987-88). Before moving to Boulder, he spent four years as a chemical physicist at AeroChem Research Labs in Princeton, New Jersey. Sasha earned his bachelor's and master's degrees in engineering physics and a second master's in electrical engineering, all at Cornell University, before completing his doctorate in physical chemistry at York University in 1982.


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