HR: 0800h
AN: A21B-0434    [Abstracts]
TI: Comparisons of Aerosol-Cloud Observations Between a Ground-based Raman-Mie Lidar and CALIPSO
AU: * Wu, Y
EM: yhwu@ccny.cuny.edu
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Chaw, S
EM: shuki@ees1s0.engr.ccny.cuny.edu
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Gross, B
EM: gross@ccny.cuny.edu
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Charles, L
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Vladutescu, V
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Cao, N
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Moshary, F
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AU: Ahmed, S
AF: The City College of New York, 140 st at Convent ave, New York, NY 10031, United States
AB: Global vertical profiles of aerosol and cloud are currently being observed by satellite CALIPSO. Based on the inherent properties of elastic-scattering lidar, the lidar ratio (extinction-to-backscatter ratio) becomes very important to quantitatively retrieve the distribution of aerosol/cloud extinction or backscatter coefficient. In this presentation, we examine the feasibility of using MODIS-retrieved aerosol optical depth over ocean to constrain the aerosol lidar ratio in the CALIPSO retrieval of aerosol extinction profile with Fernald algorithm, and then compare these lidar-ratios to those derived from both column measurements by the CIMEL Sunphotometer and a combination of the ground-based lidar and radiometer. We explore the variability of lidar ratios for the different types of aerosol over the US east coast. In addition, we present our validation measurements for aerosol vertical profiles. So far, 13 near simultaneous observations by our ground-based multi-wavelength Raman-Mie lidar which operated in New York City (40.821N, 73.949W), have been obtained together with other supporting measurements. In particular, comparisons of aerosol extinction profiles are performed between the ground- based lidar and CALIPSO observations and the vertical distribution of smoke plumes, aloft aerosol layer, urban aerosol and PBL height are presented and compared. Retrievals of optically thin clouds heights and optical depth in the low- and high-altitude from CALIPSO and MODIS/Aqua, respectively, are examined with respect to ground- based lidar measurements and several biases in the measurements are presented.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0933 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting