Date post: | 04-Jan-2016 |
Category: |
Documents |
Upload: | garry-stevens |
View: | 214 times |
Download: | 0 times |
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 StudiesSpace Science and Engineering Center
MURI Workshop, 7-9 June 2005
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)
Data Analysis Flow Chart:Absorption Optical Depth
Input data:
Radiosonde (atmospheric state)
Lidar (cloud boundaries)
FTS (emitted radiance)
Calculate clear sky transmittance for each radiosonde using LBLRTM
Interpolate temperature profile and transmittance profile to FTS time
Clear sky radiance and transmittanceto cloud base
Invert cloud absorption optical depth from FTS measurements and modeled clear sky LBLRTM calculations
AERI Measured Downwelling Radiance
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Cirrus Cloud Absorption Optical DepthYields Effective Particle Size Retrieval
AERI Measured Cirrus Particle Size Retrieval: 8 Dec 2000
AERI Measured Cirrus Particle Size Retrieval: 8 Dec 2000
AERI Absorption Optical Depth andTotal Optical Depth for Retrieved Size
Simulation Data Retrieval
GOES IR Imagery: 8 Dec 20000100 through 0245 UTC
Case Study, AFWEX 20008 Dec 2000
QuickTime™ and a decompressor
are needed to see this picture.
NAST-I and AERI Measured Cirrus Spectral Optical Depth: 8 Dec 2000
Case Study, AFWEX 20008 Dec 2000
Case Study, AFWEX 20008 Dec 2000
Case Study, AFWEX 20008 Dec 2000
Case Study, AFWEX 20008 Dec 2000
Case Study, AFWEX 20008 Dec 2000
Case Study, TX200229 Nov 2002
Case Study, TX200229 Nov 2002: Four S-HIS Overpasses
Case Study, TX200229 Nov 2002: Four S-HIS Overpasses
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-sample AERI
Case Study, TX200229 Nov 2002: Rapid-scan AERI
QuickTime™ and aCinepak decompressor
are needed to see this picture.
Summary, Future Work, and References
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.
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).