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| Titel |
Comparison of in situ and columnar aerosol spectral measurements during TexAQS-GoMACCS 2006: testing parameterizations for estimating aerosol fine mode properties |
| VerfasserIn |
D. B. Atkinson, P. Massoli, N. T. O'Neill, P. K. Quinn, S. D. Brooks, B. Lefer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 1 ; Nr. 10, no. 1 (2010-01-06), S.51-61 |
| Datensatznummer |
250007890
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| Publikation (Nr.) |
 copernicus.org/acp-10-51-2010.pdf |
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| Zusammenfassung |
| 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 (σep) were performed by two
multi-wavelength cavity ring-down (CRD) instruments, one located on board
the NOAA R/V Ronald H. Brown (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 σep data were used
to extract the extinction Ångström exponent (åep), a measure of the
wavelength dependence of σep. There was general agreement between the
åep (and to a lesser degree σep) 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 σep and AOD data to extract the fine mode fraction of
extinction (η) and the fine mode effective radius (Reff,f). 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 Reff,f 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 Reff,f agree qualitatively
(showing the same temporal trend) and quantitatively (pooled standard
deviation = 28 nm). |
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