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Daniel H. DeSlover (Dave Turner, Ping Yang) University of Wisconsin - Madison

Measurement of cirrus cloud optical properties as validation for aircraft- and satellite-based cloud studies. Daniel H. DeSlover (Dave Turner, Ping Yang) University of Wisconsin - Madison Cooperative Institute for Meteorological Satellite Studies Space Science and Engineering Center.

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Daniel H. DeSlover (Dave Turner, Ping Yang) University of Wisconsin - Madison

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  1. Measurement of cirrus cloud optical properties as validation for aircraft- and satellite-based cloud studies Daniel H. DeSlover (Dave Turner, Ping Yang) University of Wisconsin - Madison Cooperative Institute for Meteorological Satellite Studies Space Science and Engineering Center MURI Workshop, 7-9 June 2005

  2. Instrument Suite Atmospheric State Measurements • NCAR Cross-chain Loran Sounding System (CLASS), Vaisala sondes Aircraft (ER-2 or Proteus) Measurements • High spectral resolution FTS: NAST-I (NASA LaRC) or S-HIS (UW) Surface Measurements • High spectral resolution FTS: Atmospheric Emitted Radiance Interferometer (AERI) • CART Micropulse Lidar (MPL), CART Raman Lidar (CARL), or High Spectral Resolution Lidar (HSRL)

  3. Calculate clear sky transmittance for each radiosonde using LBLRTM Interpolate temperature profile and transmittance profile to FTS time Clear sky radiance and transmittance to cloud base Invert cloud absorption optical depth from FTS measurements and modeled clear sky LBLRTM calculations Data Analysis Flow Chart: Absorption Optical Depth Input data: Radiosonde (atmospheric state) Lidar (cloud boundaries) FTS (emitted radiance)

  4. AERI Measured Downwelling Radiance 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

  5. Cirrus Cloud Absorption Optical Depth Yields Effective Particle Size Retrieval

  6. AERI Measured Cirrus Particle Size Retrieval: 8 Dec 2000

  7. AERI Measured Cirrus Particle Size Retrieval: 8 Dec 2000

  8. AERI Absorption Optical Depth and Total Optical Depth for Retrieved Size

  9. Simulation Data Retrieval

  10. Case Study, AFWEX 2000 8 Dec 2000 GOES IR Imagery: 8 Dec 2000 0100 through 0245 UTC

  11. NAST-I and AERI Measured Cirrus Spectral Optical Depth: 8 Dec 2000

  12. Case Study, AFWEX 2000 8 Dec 2000

  13. Case Study, AFWEX 2000 8 Dec 2000

  14. Case Study, AFWEX 2000 8 Dec 2000

  15. Case Study, AFWEX 2000 8 Dec 2000

  16. Case Study, AFWEX 2000 8 Dec 2000

  17. Case Study, TX2002 29 Nov 2002

  18. Case Study, TX2002 29 Nov 2002: Four S-HIS Overpasses

  19. Case Study, TX2002 29 Nov 2002: Four S-HIS Overpasses

  20. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  21. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  22. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  23. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  24. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  25. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  26. Case Study, TX2002 29 Nov 2002: Rapid-sample AERI

  27. Case Study, TX2002 29 Nov 2002: Rapid-scan AERI

  28. Summary, Future Work, and References High spectral resolution FTS measurements were used to infer cirrus cloud optical depth from both aircraft- and ground-based platforms, • demonstrated good agreement for similar measurements above (NAST-I and S-HIS) and below (AERI) cloud, • good correlation between ground-based AERI and Raman lidar, • rapid-sample AERI data greatly improves ability to resolve cloud features • same approach can be used to validate AIRS measurements from Aqua. First attempt at particle size retrieval was successful for two case studies (AFWEX 2000 and TX2002). DeSlover, D. H., W. L. Smith, P. K. Piironen, and E. W. Eloranta (1999): A methodology for measuring cirrus cloud visible to infrared optical depth ratios. J. Atmos. Oceanic Technol., 16, pp. 251--262. Smith, W. L., S. Ackerman, H. Revercomb, H. Huang, D. H. DeSlover, W. Feltz, L. Gumley, and A. Collard (1998): Infrared spectral absorption of nearly invisible cirrus clouds. Geophys. Res. Lett., 25, pp. 1137-1140.

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