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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. Paul Lawson and Brad Baker (SPEC) Eric Jensen (NASA ARC), David Mitchell (Dri). Anvil and Turrets on 7/24. Aged Anvil Cirrus on 8/8. In Situ Cirrus on 7/22.

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Paul Lawson and Brad Baker (SPEC) Eric Jensen (NASA ARC), David Mitchell (Dri)

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

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

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

  4. Jensen et al. (2009)

  5. TWP-ICE ~ 100 km Downwind ~ 300 km Downwind

  6. Examples of Crystal Chains Formed in Continental Anvils With High Electric Fields (Connolly et al. 2005 - QJRMS)

  7. Comparison of Cloud Radiative Heating Profiles • Mitchell MADA Code used to Compute Optical Properties (SSA, g, bext) 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.

  8. Comparison of Cloud Radiative Heating Profiles

  9. Comparison of Cloud Radiative Heating Profiles

  10. Comparison of Cloud Radiative Heating Profiles

  11. Comparison of Cloud Radiative Heating Profiles

  12. Comparison of Cloud Radiative Heating Profiles

  13. Summary In Situ Cirrus: Aged Anvil Cirrus: Fresh Anvil Cirrus: Convective Turrets: • 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, bext, 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.

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