Microphysical and Radiative Properties of Tropical Clouds Results

Microphysical and Radiative Properties of Tropical Clouds Results

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)

Anvil and Turrets on 7/24 Aged 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. 2005 - QJRMS) Comparison of Cloud Radiative Heating Profiles Mitchell MADA Code used to

Compute Optical Properties (SSA, g, ext) from 2D-S Area and Mass PSDs Optical Properties fed into Toon et al. (1989) Two-Stream Radiative Transfer Code

to Compute Heating Rates. Comparison of Cloud Radiative Heating Profiles Comparison of Cloud Radiative Heating Profiles

Comparison of Cloud Radiative Heating Profiles Comparison of Cloud Radiative Heating Profiles Comparison of Cloud Radiative Heating Profiles

Summary Conc. In Situ Cirrus: ext

Km-1 cc-1

IWC g m-3 0.1 0.5

0.01 0.5 0.1

1 0.03 2

0.5 15 0.5 25 Aged Anvil Cirrus:

5 50 1.5 500 Fresh Anvil Cirrus: Convective

CVI and 2D-S IWC Agree to Within About 20% in the mean. Turrets: 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

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