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MODIS Ice Cloud Retrieval Statistics in the TC 4 Region July 2007

MODIS Ice Cloud Retrieval Statistics in the TC 4 Region July 2007. MODIS analysis for TC 4 region 5°N - 15°N, 90°W - 75°W 1D probability density functions Optical thickness and effective radius (land vs ocean; Terra vs Aqua) Regional images Cloud mask (Terra)

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MODIS Ice Cloud Retrieval Statistics in the TC 4 Region July 2007

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  1. MODIS Ice Cloud Retrieval Statisticsin the TC4 RegionJuly 2007 • MODIS analysis for TC4 region • 5°N - 15°N, 90°W - 75°W • 1D probability density functions • Optical thickness and effective radius (land vs ocean; Terra vs Aqua) • Regional images • Cloud mask (Terra) • Optical thickness and effective radius (land vs ocean; Terra vs Aqua) • 2D probability density functions • Optical thickness vs effective radius (land vs ocean; Terra vs Aqua) Michael D. King, Steven Platnick, and Paul A. Hubanks NASA Goddard Space Flight Center

  2. Land Ocean MODIS Terra & Aqua Cloud Optical ThicknessIce Clouds (July 2007) Blue = Terra Red=Aqua

  3. Land Ocean MODIS Terra & Aqua Cloud Effective RadiusIce Clouds (July 2007) Blue = Terra Red=Aqua

  4. MODIS TerraCloud Fraction Regional Maps (July 2007)

  5. MODIS Terra & Aqua Ice Cloud  Regional Maps (July 2007)

  6. MODIS Terra & Aqua Ice Cloud re Regional Maps (July 2007)

  7. MODIS Terra Ice Cloud  and re Joint Histograms(July 2007)

  8. MODIS Terra Water Cloud  and re Joint Histograms(July 2007)

  9. Summary of MAS/MASTER/MODIS Activities • Optical/microphysical retrieval issues • Thin cirrus limitations: sun glint, surface reflectance • Some false detection of water clouds in ice cloud regimes • Cloud mask identifies thin stratus in sunglint region as probably clear in MODIS production; turned off for these comparisons • Comparison with other instruments/techniques, including: • Remote sensing IR techniques (MASTER/SHIS with MODIS) Radar/lidar (CRS, EDOP, CPL with MODIS) for cloud top altitude Water path/particle size (SSFR with MASTER/MAS and MODIS) • In situ: CIN, size distributions, etc. • Science - why do these retrievals matter? • Establish accuracy of remote sensing of cloud microphysics • Important for assessing any indirect effects of aerosols on clouds • Establish accuracy of cloud top altitude algorithm • Compare MAS/MASTER & MODIS retrievals with CALIOP, CPL, and OMI • Establish confidence in thin cirrus and multilayer cloud detection • Intercomparisons with MAS/MASTER and CPL on ER-2 • Intercomparisons with POLDER on PARASOL and CALIOP on CALIPSO

  10. MODIS Cloud Optical ThicknessLiquid Water Clouds Land Ocean

  11. True Color and Cloud Top PressureTerra/MODIS True Color Composite (0.65, 0.56, 0.47) Cloud Top Pressure (hPa) 100 250 400 550 700 850 1000 Cloud Top Pressure (hPa) July 29, 2007

  12. Cloud Optical Thickness and Effective RadiusTerra/MODIS Cloud Optical Thickness Cloud Effective Radius (µm) 1 10 100 1 10 100 6 20 33 47 60 2 9 16 23 30 Ice Liquid Water Ice Liquid Water July 29, 2007

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