Atmospheric planetary boundary‐layer research in the U.S. 1991–1994

With the increasing emphasis on coupled climate systems, planetary‐boundary‐layer (PBL) research has also gained increasing attention. Atmospheric and oceanic PBLs serve as the interface between all of the system components: atmosphere, ocean, land, and biosphere. Boundary‐layer clouds also play important roles in climate, e.g., trade‐wind cumulus in the hydrological cycle and subtropical marine stratus in the Earth's radiation budget. Therefore, proper PBL parameterization schemes are needed to accurately link all of the climate system components and to represent cloud formation and dissipation.