CART and GSFC Raman lidar measurements of atmospheric aerosol backscattering and extinction profiles for EOS validation and ARM radiation studies
- National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
- Pacific Northwest National Lab., Richland, WA (United States)
- Univ. of Maryland, Baltimore, MD (United States)
- National Aeronautics and Space Administration, Greenbelt, MD (United States)
- Sandia National Labs., Livermore, CA (United States)
The aerosol retrieval algorithms used by the Moderate-Resolution Imaging Spectroradiometer (MODIS) and Multi-Angle Imaging SpectroRadiometer (MISR) sensors on the Earth Observing Satellite (EOS) AM-1 platform operate by comparing measured radiances with tabulated radiances that have been computed for specific aerosol models. These aerosol models are based almost entirely on surface and/or column averaged measurements and so may not accurately represent the ambient aerosol properties. Therefore, to validate these EOS algorithms and to determine the effects of aerosols on the clear-sky radiative flux, the authors have begun to evaluate the vertical variability of ambient aerosol properties using the aerosol backscattering and extinction profiles measured by the Cloud and Radiation Testbed (CART) and NASA Goddard Space Flight Center (GSFC) Raman Lidars. Using the procedures developed for the GSFC Scanning Raman Lidar (SRL), the authors have developed and have begun to implement algorithms for the CART Raman Lidar to routinely provide profiles of aerosol extinction and backscattering during both nighttime and daytime operations. Aerosol backscattering and extinction profiles are computed for both lidar systems using data acquired during the 1996 and 1997 Water Vapor Intensive Operating Periods (IOPs). By integrating these aerosol extinction profiles, they derive measurements of aerosol optical thickness and compare these with coincident sun photometer measurements. They also use these measurements to measure the aerosol extinction/backscatter ratio S{sub a} (i.e. lidar ratio). Furthermore, they use the simultaneous water vapor measurements acquired by these Raman lidars to investigate the effects of water vapor on aerosol optical properties.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 671916
- Report Number(s):
- SAND-98-8559C; CONF-980722-; ON: DE98052866; TRN: AHC2DT07%%74
- Resource Relation:
- Conference: 19. international laser radar conference, Annapolis, MD (United States), 6-10 Jul 1998; Other Information: PBD: Apr 1998
- Country of Publication:
- United States
- Language:
- English
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