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

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Presentation on theme: "Large-Eddy Simulation of the VOCALS RF06 Pocket of Open Cells:"— Presentation transcript:

1 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

2 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

3 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

4 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

5 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

6 Cloud Field Evolution Pseudo-albedo snapshots

7 Effects of Nc Advection

8 Time Series

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

10 Cold Pooling

11 Mesoscale Circulation

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

13 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

14 Thanks for listening! Questions?

15 Entrainment Time Series

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