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          Institute: MPI für Meteorologie     Collection: Climate Processes     Display Documents

ID: 350940.0, MPI für Meteorologie / Climate Processes
A single-column model intercomparison of a heavily drizzling stratocumulus-topped boundary layer
Authors:Wyant, Matthew C.; Bretherton, Christopher S.; Chlond, Andreas; Griffin, Brian M.; Kitagawa, Hiroto; Lappen, Cara-Lyn; Larson, Vincent E.; Lock, Adrian; Park, Sungsu; de Roode, Stephan R.; Uchida, Junya; Zhao, Ming; Ackerman, Andrew S.
Date of Publication (YYYY-MM-DD):2007-12
Title of Journal:Journal of Geophysical Research - Atmospheres
Journal Abbrev.:J. Geophys. Res. - Atmos.
Sequence Number of Article:D24204
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:This study presents an intercomparison of single-column model simulations of a nocturnal heavily drizzling marine stratocumulus-topped boundary layer. Initial conditions and forcings are based on nocturnal flight observations off the coast of California during the DYCOMS-II field experiment. Differences in turbulent and microphysical parameterizations between models were isolated by slightly idealizing and standardizing the specification of surface and radiative fluxes. For most participating models, the case was run at both typical operational vertical resolution of about 100 m and also at high vertical resolution of about 10 m. As in prior stratocumulus intercomparisons, the simulations quickly develop considerable scatter in liquid water path (LWP) between models. However, the simulated dependence of cloud base drizzle fluxes on LWP in most models is broadly consistent with recent observations. Sensitivity tests with drizzle turned off show that drizzle substantially decreases LWP for many models. The sensitivity of entrainment rate to drizzle is more muted. Simulated LWP and entrainment are also sensitive to the inclusion of cloud droplet sedimentation. Many models underestimate the fraction of drizzle that evaporates below cloud base, which may distort the simulated feedbacks of drizzle on turbulence, entrainment, and LWP.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Meteorologie/Land in the Earth System (2005-)
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