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dc.contributor.authorGerber, H.
dc.contributor.authorFrick, G.
dc.contributor.authorMalinowski, Szymon P.
dc.contributor.authorJonsson, H.
dc.contributor.authorKhelif, D.
dc.contributor.authorKrueger, Steven K.
dc.date.accessioned2015-09-03T22:01:39Z
dc.date.available2015-09-03T22:01:39Z
dc.date.issued2013
dc.identifier.citationGerber, H., G. Frick, S. P. Malinowski, H. Jonsson, D. Khelif, and S. K. Krueger (2013), Entrainment rates and microphysics in POST stratocumulus, J. Geophys. Res. Atmos., 118, 12,094–12,109, doi:10.1002/jgrd.50878.en_US
dc.identifier.urihttps://hdl.handle.net/10945/46392
dc.descriptionThe article of record as published may be located at http://dx.doi.org/10.1002/jgrd.50878en_US
dc.description.abstractAn aircraft field study (POST; Physics of Stratocumulus Top) was conducted off the central California coast in July and August 2008 to deal with the known difficulty of measuring entrainment rates in the radiatively important stratocumulus (Sc) prevalent in that area. The Center for Interdisciplinary Remotely-Piloted Aircraft Studies Twin Otter research aircraft flew 15 quasi-Lagrangian flights in unbroken Sc and carried a full complement of probes including three high-data-rate probes: ultrafast temperature probe, particulate volume monitor probe, and gust probe. The probes’ colocation near the nose of the Twin Otter permitted estimation of entrainment fluxes and rates with an in-cloud resolution of 1m. Results include the following: Application of the conditional sampling variation of classical mixed layer theory for calculating the entrainment rate into cloud top for POST flights is shown to be inadequate for most of the Sc. Estimated rates resemble previous results after theory is modified to take into account both entrainment and evaporation at cloud top given the strong wind shear and mixing at cloud top. Entrainment rates show a tendency to decrease for large shear values, and the largest rates are for the smallest temperature jumps across the inversion. Measurements indirectly suggest that entrained parcels are primarily cooled by infrared flux divergence rather than cooling from droplet evaporation, while detrainment at cloud top causes droplet evaporation and cooling in the entrainment interface layer above cloud top.en_US
dc.description.sponsorshipNSF supported H. Gerber, G. Frick, and S. Malinowski (ATM-0735121, AGS-1020445), D. Khelif (ATM-0734323), and S. Krueger (ATM-0735118). The Office of Naval Research and the Naval Postgraduate School supported in part the deployment of the Twin Otter aircraft.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleEntrainment rates and microphysics in POST stratocumulusen_US
dc.typeArticleen_US
dc.contributor.corporateCenter for Interdisciplinary Remotely-Piloted Aircraft Studiesen_US
dc.contributor.departmentMeteorologyen_US


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