Paul Lawson and Brad Baker (SPEC) Eric Jensen (NASA ARC), David Mitchell (Dri) Microphysical and Radiative Properties of Tropical Clouds R esults from.

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Presentation transcript:

Paul Lawson and Brad Baker (SPEC) Eric Jensen (NASA ARC), David Mitchell (Dri) Microphysical and Radiative Properties of Tropical Clouds R esults from TC4 and NAMMA

Anvil and Turrets on 7/24Aged Anvil Cirrus on 8/8 In Situ Cirrus on 7/22

Decrease in Number Concentration, Extinction and Mass Across a TC4 Anvil from DC-8 In Situ Data at FL370 on 24 July 2008

Jensen et al. (2009)

TWP-ICE ~ 100 km Downwind ~ 300 km Downwind

Examples of Crystal Chains Formed in Continental Anvils With High Electric Fields (Connolly et al QJRMS)

Comparison of Cloud Radiative Heating Profiles (SSA, g,  Mitchell MADA Code used to Compute Optical Properties (SSA, g,  ext ) from 2D-S Area and Mass PSD’s  Optical Properties fed into Toon et al. (1989) Two-Stream Radiative Transfer Code to Compute Heating Rates.

Comparison of Cloud Radiative Heating Profiles

 CVI and 2D-S IWC Agree to Within About 20% in the mean.  Average Microphysical Properties are Similar from one Tropical Maritime Region (TC4) to Another (NAMMA)  Significant Microphysical Variability (i.e., Particle Concentration,  ext, IWC, Particle Shape) Exists Within a Region on scales from Tens to Thousands of Kilometers, however, Particles from about 100 to 400  m Dominate Extinction and IWC in all Cloud Types.  Two-Stream Radiative Transfer Model (Toon 1989) gives Cloud Heating Rates using Actual In Situ Measurements. Summary Conc. cc -1  ext Km -1 IWC g m -3  In Situ Cirrus: Aged Anvil Cirrus: Fresh Anvil Cirrus: Convective Turrets: