Atmospheric Chemistry and Physics
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10
1
2010
10.5194/acp-10-51-2010
http://www.atmos-chem-phys.net/10/51/2010/
http://www.atmos-chem-phys.net/10/51/2010/acp-10-51-2010.html
http://www.atmos-chem-phys.net/10/51/2010/acp-10-51-2010.pdf
51
61
2010-01-06
Comparison of in situ and columnar aerosol spectral measurements during TexAQS-GoMACCS 2006: testing parameterizations for estimating aerosol fine mode properties
D. B. Atkinson
atkinsond@pdx.edu
P. Massoli
N. T. O'Neill
P. K. Quinn
S. D. Brooks
B. Lefer
Chemistry Department, Portland State University, Portland, OR, 97207-0751, USA
University of Colorado, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, 80309, USA
NOAA Earth System Research Laboratory, Chemical Science Division, Boulder, CO, 80305, USA
CARTEL, Département de géomatique appliqueé, Université de Sherbrooke, Sherbrooke, Quebec, J1K 2R1, Canada
NOAA Pacific Marine Environment Laboratory, 7600 Sand Point Way NE, Seattle, WA, 98115, USA
Department of Atmospheric Sciences, Texas A & M University, College Station, TX, 77843, USA
Earth and Atmospheric Sciences Department, University of Houston, Houston, TX, 77204-5007, USA
now at: Aerodyne Research, Inc. Billerica, MA, 01821, USA
During the 2006 Texas Air Quality Study and Gulf of Mexico Atmospheric
Composition and Climate Study (TexAQS-GoMACCS 2006), the optical, chemical
and microphysical properties of atmospheric aerosols were measured on
multiple mobile platforms and at ground based stations. In situ measurements of the
aerosol light extinction coefficient (σ<sub>ep</sub>) were performed by two
multi-wavelength cavity ring-down (CRD) instruments, one located on board
the NOAA R/V <i>Ronald H. Brown</i> (RHB) and the other located at the University of Houston, Moody
Tower (UHMT). An AERONET sunphotometer was also located at the UHMT to
measure the columnar aerosol optical depth (AOD). The σ<sub>ep</sub> data were used
to extract the extinction Ångström exponent (å<sub>ep</sub>), a measure of the
wavelength dependence of σ<sub>ep</sub>. There was general agreement between the
å<sub>ep</sub> (and to a lesser degree σ<sub>ep</sub>) measurements by the two spatially
separated CRD instruments during multi-day periods, suggesting a regional
scale consistency of the sampled aerosols. Two spectral models are applied
to the σ<sub>ep</sub> and AOD data to extract the fine mode fraction of
extinction (η) and the fine mode effective radius (<i>R</i><sub>eff,f</sub>). These
two parameters are robust measures of the fine mode contribution to total
extinction and the fine mode size distribution, respectively. The results of
the analysis are compared to <i>R</i><sub>eff,f</sub> values extracted using AERONET V2
retrievals and calculated from in situ particle size measurements on the RHB and at
UHMT. During a time period when fine mode aerosols dominated the extinction
over a large area extending from Houston/Galveston Bay and out into the Gulf
of Mexico, the various methods for obtaining <i>R</i><sub>eff,f</sub> agree qualitatively
(showing the same temporal trend) and quantitatively (pooled standard
deviation = 28 nm).
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