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

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Presentation transcript:

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

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

3 SID 2: open path, less shattering

4

5

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

8 Locations of IWC measurements M. Kraemer, submitted

9 IWC versus temperature

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 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.