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Atmospheric Composition

With lidar and polarimeter observations from satellite missions such as Parasol, CALIPSO, Glory and Earthcare, a new era of highly accurate climate monitoring (Mishchenko et al., 2007) is on the horizon. CALIPSO lidar measurements are sensitive to changes in the vertical distribution of aerosols and clouds, as well as changes in the ocean biogeochemistry and air-sea gas/heat/momentum exchange. However, using such measurements to quantify these changes requires assumptions to be made for the size distribution of aerosols and cloud droplets, the optical depth of aerosols, and the roughness of the ocean surface. The uncertainty in these assumptions will be significantly reduced by adding information derived from Glory measurements. Based on our previous studies using CALIPSO data, we propose to investigate the feasibility of using combined polarimeter and lidar measurements to monitor changes in these atmosphere and ocean components. The investigation includes: (1) Using radiative transfer models to establish strategies for vicarious calibration of lidar and polarimeters. This includes assessing the calibration uncertainty and the long term stability of the CALIPSO operational and onboard APS calibrations by comparing model calculation with measurements of various vicarious calibration targets. (2) Studying the `Aeronet In Space' concept with combined lidar, radar and polarimeter measurements of ocean surface, with emphasis on the importance of polarimeter measurements. (3) Develop research algorithms for establishing climate records with combined APS polarimeter and CALIPSO lidar measurements. These climate records include the size distribution, particle number concentration, total optical depth, and vertical distribution of aerosols and clouds; the liquid water content of water clouds; the heat and gas transfer velocity at air-sea interface; and ocean biochemistry. The objectives of this proposed study are to improve the quality of the above-mentioned atmosphere and ocean climate records with collocated polarimeter and lidar measurements in space. These objectives are in concert with CALIPSO's extended mission objectives, and will assist decadal missions such as Aerosols, Clouds, and Ecosystem (ACE) mission and Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission.

Project PI: Yongxiang Hu/NASA Langley Research Center

MS 435 NASA Langley Research Center Hampton, VA 23681-2199

Phone: (757) 864-7775

Fax: (757) 864-9824

Email: yongxiang.hu-1@nasa.gov

http://asd-www.larc.nasa.gov/people_html/hu.html

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Started: Sep 27, 2010

Last Activity: Jan 04, 2011

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