HR: 0800h
AN: A41B-0449    [Abstracts]
TI: Scattering Theory for Lidar Remote Sensing Applications: Progress and Challenge
AU: * Hu, Y
EM: yongxiang.hu-1@nasa.gov
AF: NASA Langley Research Center, MS 475 NASA LaRC, Hampton, VA 23681,
AU: Vaughan, M
EM: Mark.A.Vaughan@nasa.gov
AF: NASA Langley Research Center, MS 475 NASA LaRC, Hampton, VA 23681,
AU: Yang, P
EM: pyang@csrp.tamu.edu
AF: Texas A&M University, Texas A&M University 3150 TAMU, College Station, TX 77843,
AU: Trepte, C
EM: David.M.Winker@nasa.gov
AF: NASA Langley Research Center, MS 475 NASA LaRC, Hampton, VA 23681,
AU: Winker, D
EM: charles.r.trepte@nasa.gov
AF: NASA Langley Research Center, MS 475 NASA LaRC, Hampton, VA 23681,
AB: Cloud, aerosol and ocean studies using CALIPSO data are based on our understanding of single and multiple scattering of various particulates and ocean surface. In this presentation, we discuss the applications of scattering theory and model in CALIPSO data analysis, and the areas that need more theoretical studies. This includes, 1. 532nm calibration. CALIPSO lidar uses molecular backscatter for calibration. Our discussion includes, A. What is the physics basis of this calibration procedure and its uncertainty? B. How do we assess the calibration performance using other well known targets, such as water clouds? 2. 1064nm calibration. CALIPSO uses thick ice clouds for 1064nm calibration while assuming constant lidar ratio for these clouds. Theoretical studies are needed to answer these questions, A. Are the color ratios for thick ice clouds constant? B. Can we use other objects (water clouds, ocean surface) to verify that? 3. Multiple scattering of clouds and aerosols. A. How do we estimate multiple scattering factors of ice clouds, water clouds and aerosols? B. How do we separate multiple scattering from detector transient response in CALIPSO data? 4. Cloud phase studies, A. How does CALIPSO identify cloud phase? B. What is the signature of horizontally oriented ice particles? 5. Ocean studies, A. Can we see ocean sub-surface from CALIPSO 532nm perpendicular channel? B. How accurate can we derive ocean surface winds and atmospheric column optical depths? 6. Long term stability, A. Is CALIPSO molecular calibration changing from month to month? B. How well can CALIPSO detect cloud and aerosol trends? We will present where we are in terms of understanding these questions.
DE: 0319 Cloud optics
DE: 3359 Radiative processes
DE: 3360 Remote sensing
DE: 4801 Aerosols (0305, 4906)
DE: 4906 Aerosols (0305, 4801)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting