1. 1 START08 Heymsfield/Avallone UTLS PSDs Stratospheric PSDs Population-mean ice crystal densities Crystal shape information (SID-2) Extinction estimates Ice water content

2. 2 Particle Size Distributions Top of Anvil Decaying Anvil In-Situ cirrus

3. 3 SID 2: open path, less shattering

4. 4

5. 5

6. 6 Cirrus Ice water content (IWC) Bulk microphysical property of clouds, but highly variable within an individual cloud Critical parameter in determining radiative forcing of a cloud (via IWP) Key prognostic variable in GCMs from which to determine radiative properties Data are still sparse!

7. 7 Relationship between IWP and TOA Forcing Garrett et al., GRL, 2003 R e = 5-10  m

8. 8 Locations of IWC measurements M. Kraemer, submitted

9. 9 IWC versus temperature

10. 10 Sampling locations ARM CART and Madison HSRL overflights Underflight of A-train satellites, including CloudSat, CALIPSO, MODIS and AIRS (to further ongoing intercomparison work) Colorado, wave cloud situations Direct measurements of convective outflow

11. 11 Specific areas of interest Cubic ice – Make contrail, then sample as contrail evolves Pileus and wave clouds – lay contrail (high saturation) or exhaust plume (low saturation) and follow plume through uplift region.