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

Microphysical and Radiative Microphysical and Radiative Properties of Tropical Clouds Properties of Tropical Clouds RResults esults

from TC4 and NAMMAfrom TC4 and NAMMA

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 ProfilesComparison of Cloud Radiative Heating Profiles

Mitchell MADA Code used to Compute Optical Properties (SSA, g(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 ProfilesComparison of Cloud Radiative Heating Profiles

Comparison of Cloud Radiative Heating ProfilesComparison of Cloud Radiative Heating Profiles

Comparison of Cloud Radiative Heating ProfilesComparison of Cloud Radiative Heating Profiles

Comparison of Cloud Radiative Heating ProfilesComparison of Cloud Radiative Heating Profiles

Comparison of Cloud Radiative Heating ProfilesComparison 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.

SummarySummaryConc.

cc-1

extKm-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

5 50 1.5 500

In Situ Cirrus: Aged Anvil Cirrus: Fresh Anvil Cirrus: Convective Turrets: