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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 108, NO. D19,
8588,
doi:10.1029/2002JD002520,
2003
Airborne Sun photometer measurements of aerosol optical depth and columnar water vapor during the Puerto Rico Dust Experiment
and comparison with land, aircraft, and satellite measurements
John M. Livingston
SRI International, Menlo Park, California, USA
Philip B. Russell
NASA Ames Research Center, Moffett Field, California, USA
Jeffrey S. Reid
SPAWAR Systems Center San Diego, San Diego, California, USA
Jens Redemann
Bay Area Environmental Research Institute, Sonoma, California, USA
Beat Schmid
Bay Area Environmental Research Institute, Sonoma, California, USA
Duane A. Allen
NASA Ames Research Center, Moffett Field, California, USA
Omar Torres
Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, Maryland, USA
Robert C. Levy
Science Systems and Applications, Inc., Lanham, Maryland, USA
Lorraine A. Remer
Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Brent N. Holben
Laboratory for Terrestrial Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Alexander Smirnov
Goddard Environmental Science and Technology Center, University of Maryland Baltimore County, and NASA Goddard Space Flight
Center, Greenbelt, Maryland, USA
Oleg Dubovik
Goddard Environmental Science and Technology Center, University of Maryland Baltimore County, and NASA Goddard Space Flight
Center, Greenbelt, Maryland, USA
Ellsworth J. Welton
Goddard Environmental Science and Technology Center, University of Maryland Baltimore County, and NASA Goddard Space Flight
Center, Greenbelt, Maryland, USA
James R. Campbell
Science Systems and Applications, Inc., Lanham, Maryland, USA
Jun Wang
Department of Atmospheric Sciences, University of Alabama in Huntsville, Huntsville, Alabama, USA
Sundar A. Christopher
Department of Atmospheric Sciences, University of Alabama in Huntsville, Huntsville, Alabama, USA
Abstract
Analyses of aerosol optical depth (AOD) and columnar water vapor (CWV) measurements obtained with the six-channel NASA Ames
Airborne Tracking Sunphotometer (AATS-6) mounted on a twin-engine aircraft during the summer 2000 Puerto Rico Dust Experiment
are presented. In general, aerosol extinction values calculated from AATS-6 AOD measurements acquired during aircraft profiles
up to 5 km above sea level (asl) reproduce the vertical structure measured by coincident aircraft in situ measurements of
total aerosol number concentration. AATS-6 extinction retrievals also agree with corresponding values derived from ground-based
lidar measurements for altitudes above the trade inversion. The spectral behavior of AOD within specific layers beneath the
top of the aircraft profile is consistent with attenuation of incoming solar radiation by large dust particles or by dust
plus sea salt, with mean Ångström wavelength exponents of ∼0.20. Values of CWV calculated from profile measurements by AATS-6
at 941.9 nm and from aircraft in situ measurements agree to within ∼4% (0.13 g/cm2). AATS-6 AOD values measured on the ground at Roosevelt Roads Naval Air Station and during low-altitude aircraft runs over
the adjacent Cabras Island aerosol/radiation ground site agree to within 0.004–0.030 with coincident data obtained with an
AERONET Sun/sky radiometer located on Cabras Island. For the same observation times, AERONET retrievals of CWV exceed AATS-6
values by ∼21%. AATS-6 AOD values measured during low-altitude aircraft traverses over the ocean are compared with corresponding
AOD values retrieved over water from upwelling radiance measurements by the Moderate-Resolution Imaging Spectroradiometer
(MODIS), Total Ozone Mapping Spectrometer (TOMS), and GOES 8 Imager satellite sensors, with mixed results.
Received 9
May
2002;
accepted 30
August
2002;
published 2
July
2003.
Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0360 Atmospheric Composition and Structure: Transmission and scattering of radiation; 3359 Meteorology and Atmospheric Dynamics: Radiative processes; 3360 Meteorology and Atmospheric Dynamics: Remote sensing.
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Citation: Livingston, J. M., et al.
(2003),
Airborne Sun photometer measurements of aerosol optical depth and columnar water vapor during the Puerto Rico Dust Experiment
and comparison with land, aircraft, and satellite measurements,
J. Geophys. Res.,
108(D19),
8588,
doi:10.1029/2002JD002520.
Copyright 2003 by the American Geophysical Union.
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