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Published December 22, 2009 | Published
Journal Article Open

Marine stratocumulus aerosol-cloud relationships in the MASE-II experiment: Precipitation susceptibility in eastern Pacific marine stratocumulus


Observational data on aerosol-cloud-drizzle relationships in marine stratocumulus are presented from the second Marine Stratus/Stratocumulus Experiment (MASE-II) carried out in July 2007 over the eastern Pacific near Monterey, California. Observations, carried out in regions of essentially uniform meteorology with localized aerosol enhancements due to ship exhaust ("ship tracks"), demonstrate, in accord with those from numerous other field campaigns, that increased cloud drop number concentration Nc and decreased cloud top effective radius r_e are associated with increased subcloud aerosol concentration. Modulation of drizzle by variations in aerosol levels is levels is clearly evident. Variations of cloud base drizzle rate R_(cb) are found to be consistent with the proportionality, R_(cb) / H^3/N_c, where H is cloud depth. Simultaneous aircraft and A-Train satellite observations are used to quantify the precipitation susceptibility of clouds to aerosol perturbations in the eastern Pacific region.

Additional Information

© 2009 by the American Geophysical Union. Received 1 July 2009; revised 21 September 2009; accepted 28 September 2009; published 22 December 2009. This work was supported by the Office of Naval Research grant N00014-04-1-0018. A.S. acknowledges support from the Cooperative Institute for Research in the Atmosphere Postdoctoral Research Program. G.F. acknowledges NOAA's Climate Goal. The authors acknowledge Robert Wood for helpful comments.

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Published - Lu2009p6709J_Geophys_Res-Atmos.pdf


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