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Informal Seminar by Zhaoyan Liu |
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Date: February 1, 2006
Time: 12:00pm
Location: NIA, Rm 137
Lidar Atmospheric Remote Sensing
Zhaoyan Liu
Lidar (LIght Detection And Ranging) or laser radar is an effective tool for atmospheric remote sensing. Since the first lidar was built in early 1960s, different lidar techniques have been developed to measure atmospheric parameters (e.g., temperature and wind velocity), cloud and aerosol distribution, chemical concentration, etc. Observations can be conducted ground based, mobile, air or space borne.
A space borne lidar (CALIOP) has been developed at the NASA Langley Research Center to profile aerosols and clouds globally. CALIOP is a two-wavelength (1064 and 532 nm), polarization-sensitive backscatter lidar. It will be onboard the CALIPSO satellite to be launched in November 2005 as part of the "A-train" satellite constellation. Combined with other active and passive instruments, CALIOP will provide new insight into the role that clouds and aerosols play in modifying Earth's weather, climate and air quality. CALIOP will be introduced in detail in the presentation.
High-spectral-resolution lidar (HSRL) is an enhanced backscatter lidar technique, in which a narrow band filter is introduced to serve as a spectral device, so that more optical parameters of clouds and aerosols can be measured. A ground-based HSRL developed at National Institute for Environmental Studies (NIES) in Japan and its measurements of atmospheric temperature, aerosol and cloud optical parameters will also be introduced.
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