Numerical Simulation of Cirrus Clouds - Fire Case Study and Sensitivity Analysis

作者: Scot T. Heckman

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摘要: Abstract : The October 28, 1986 FIRE (First ISCCP Regional Experiment) case was simulated using the Atmospheric Modeling System. This three dimensional, mesoscale model applied in non-hydrostatic and nested-grid mode explicit, bulk microphysics radiation. simulation resulted very good agreement between observed predicted dynamic cloud fields. We verified height, thickness, areal extent microphysical composition against GOES satellite imagery, lidar, aircraft measurements taken during Cirrus IFO (Intensive Field Observation). cirrus lifecycle is examined to determine possible formation, maintenance dissipation mechanisms. Sensitivity simulations were run long short wave radiative forcing. Also, a with no condensate examine feedbacks on environment. Cloud top generation zones, fallstreaks, layering simulated. Longwave radiation appeared be instrumental developing weak convective activity lower layer thereby increasing it's optical depth. cooling base heating affected flow around cloud. Secondarily, effects of upper boundary conditions clouds studied synoptic setting.

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