Large-Eddy Simulation of the VOCALS RF06 Pocket of Open Cells:

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Presentation transcript:

Large-Eddy Simulation of the VOCALS RF06 Pocket of Open Cells: Dynamics, Maintenance Timescale for Microphysical Gradients, and Entrainment Andy Berner, Chris Bretherton, Rob Wood

Modeling Objectives Effects of Nc treatment Comparison to Observations Evaluate the sensitivity of the simulation to the choice of fixed or advected Nc distribution Comparison to Observations See if LES can capture the character of the observed boundary layer when initialized from observations Entrainment Investigate differences in entrainment between the overcast (OVC), open-cellular (POC), and transition (TRANS) regions

Model and Simulation Configuration SAM v6.7 LES Anelastic dynamical formulation Morrison 2005 microphysics Advected or fixed Nc CAM3 radiation Simulation Bowling alley domain, 192 km x 24km in horizontal, x direction oriented perpendicular to mean PBL wind 125m Δx and Δy, varying Δz of 30m near surface, 5m near inversion, stretched to grid top at 30km for radiation Total of 192x192x1536 gridpoints

Initialization Thermodynamic and Wind Profiles Basic profile assembled from RF06 legs P2d, P4u, and NCEP reanalysis Wind profile tweaked such that mean boundary layer wind spins up with geostrophic forcing to profile similar to obs

Initialization (2) Microphysics Varying Nc specified across x direction Nc of 60 cm-3 in overcast region (88 km) Nc of 10 cm-3 in POC region (88 km) 8 km half sine wave transitions between regions

Cloud Field Evolution Pseudo-albedo snapshots

Effects of Nc Advection

Time Series

Profiles: 02-04 LST We_OVC = 7mm s-1 We_POC = 4mm s-1

Cold Pooling

Mesoscale Circulation

Entrainment Analysis of streamfunction at level of inversion suggests diminished effective subsidence over POC

Conclusions LES initialized from observations captures the basic behavior of the boundary layer fairly well Too much cloud in the POC; less simplistic microphysical scheme necessary? Entrainment differential across between POC and surrounding overcast compensated by mesoscale circulation in order to keep the inversion level

Thanks for listening! Questions?

Entrainment Time Series