Dynamics and chemistry of marine stratocumulus - Dycoms-II

TitleDynamics and chemistry of marine stratocumulus - Dycoms-II
Publication TypeJournal Article
Year of Publication2003
AuthorsStevens, B., D. H. Lenschow, G. Vali, H. Gerber, A. Bandy, B. Blomquist, J. L. Brenguier, C. S. Bretherton, F. Burnet, T. Campos, S. Chai, I. Faloona, D. Friesen, S. Haimov, K. Laursen, D. K. Lilly, S. M. Loehrer, S. P. Malinowski, B. Morley, M. D. Petters, D. C. Rogers, L. Russell, V. Savic-Jovac, J. R. Snider, D. Straub, M. J. Szumowski, H. Takagi, D. C. Thornton, M. Tschudi, C. Twohy, M. Wetzel, and M. C. van Zanten
JournalBulletin of the American Meteorological Society
Volume84
Pagination579-+
KeywordsCLOUD CONDENSATION NUCLEI GENERAL-CIRCULATION MODELS PLANETARY BOUNDARY-LAYER LARGE-EDDY SIMULATIONS TROPICAL PACIFIC MIXED LAYER MICROPHYSICS ASTEX OCEAN ENTRAINMENT
Abstract

The second Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) field study is described. The field program consisted of nine flights in marine stratocumulus west-southwest of San Diego, California. The objective of the program was to better understand the physics and dynamics of marine stratocumulus. Toward this end special flight strategies, including predominantly nocturnal flights, were employed to optimize estimates of entrainment velocities at cloud-top, large-scale divergence within the boundary layer, drizzle processes in the cloud, cloud microstructure, and aerosol-cloud interactions. Cloud conditions during DYCOMS-II were excellent with almost every flight having uniformly overcast clouds topping a well-mixed boundary layer. Although the emphasis of the manuscript is on the goals and methodologies of DYCOMS-II, some preliminary findings are also presented-the most significant being that the cloud layers appear to entrain less and drizzle more than previous theoretical work led investigators to expect.