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The Properties of Cirrus over the Atlantic Basin Revealed by A-Train and SEVIRI data

The Properties of Cirrus over the Atlantic Basin Revealed by A-Train and SEVIRI data. Betsy Dupont and Jay Mace, University of Utah Pat Minnis and Rabi Palikonda, NASA Langley Research Center CALIPSO/CloudSat Science Workshop, Madison, WI, July 28-31 Approach:

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The Properties of Cirrus over the Atlantic Basin Revealed by A-Train and SEVIRI data

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  1. The Properties of Cirrus over the Atlantic Basin Revealed by A-Train and SEVIRI data Betsy Dupont and Jay Mace, University of Utah Pat Minnis and Rabi Palikonda, NASA Langley Research Center CALIPSO/CloudSat Science Workshop, Madison, WI, July 28-31 Approach: Consider the A-Train constellation as a single synergistic observational suite. Augment the instantaneous view of A-Train with the temporal view from geostationary.

  2. The Global Coverage of High (>6km) Layers From Merged CC Data (RL-GEOPROF) Mace et al. (2008)

  3. Clustering of Cirrus Events • 100-profile Atlantic cirrus events from 2007 • followed approach of Zhang (2007) • Clustering based on histograms of reflectivity and pressure Lidar Radar

  4. P-dBZ Pattern for Resulting Cirrus Cluster Centroids • Anvil Cirrus • 13% of events • High, Thin cirrus • 60% of events • Thick Cirrus • 27% of events

  5. Question: • What are the relationships between cirrus properties (and their temporal change) and the large-scale dynamics? • Next: • Track Cirrus in time following Soden (1998) technique • Case study of a dissipating aging anvil • Examine composite large-scale dynamics derived from NCEP/NCAR reanalysis for thickening and thinning cirrus in the northern and southern hemispheres

  6. Case Study: A region of thinning AGING anvil cirrus

  7. Case Study: A region of thinning AGING anvil cirrus R = 0.61 Bias = 91 g/m^2

  8. Composite of Large-Scale Dynamics for Mid Latitude Thick Cirrus Tb decreasing (thickening) Tb increasing (thinning) • Northern Hemisphere • Southern Hemisphere * * * * ✪

  9. Vertical Structure of Cirrus Layer Microphysics Thickening = red Thinning = black High, Thin Cirrus Thick Cirrus

  10. Summary: Combining A-Train with Geostationary time series allows us to place events within a temporal context adding knowledge of changes in the hydrometeor field. Compositing of large-scale dynamics suggests strong relationships between temporal changes in the cloud field and meteorology. Work in Progress: Clustering cirrus based on large-scale dynamics What are the microphysical processes that control the differences in thickening and thinning cases? How do tropical anvils evolve from injected ice into long-lasting cloud fields?

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