Comparison of surface and column measurements of aerosol scattering properties over the western North Atlantic Ocean at Bermuda
Author:
Aryal R. P.,Voss K. J.,Terman P. A.,Keene W. C.,Moody J. L.,Welton E. J.,Holben B. N.
Abstract
Abstract. Light scattering and spectral absorption by size-resolved aerosols in near-surface air at Tudor Hill, Bermuda were measured continuously between January and June 2009. Vertical distributions of aerosol backscattering and column-averaged aerosol optical properties were characterized in parallel with a Micro-pulse lidar (MPL) and an automated sun-sky radiometer. Aerosol optical properties measured near the surface were often significantly correlated with those averaged over the column. These include scattering by near-surface bulk aerosol at 530 nm vs. column aerosol optical depth (AOD), near-surface sub-μm scattering fraction vs. column averaged sub-μm scattering fraction, the column averaged Angstrom exponent derived using a column integrated size distribution and complex refractive index. The relative contribution of submicron aerosol light scattering to total aerosol light scattering shows a slight enhancement of the column contribution of submicron particles over the surface measurements. Physical factors such as surface level wind speed have a more important affect on bulk aerosol light scattering at the surface.
Publisher
Copernicus GmbH
Reference60 articles.
1. Anderson, J. R., Buseck, P. R., Patterson, T. L., Arimoto, R.: Characterization of the Bermuda Troposphere Aerosol by combined individual particle and bulk aerosol analysis, Atmos. Environ., 30, 319–338, 1996. 2. Anderson, T. L. and Ogren, J. A.: Determining aerosol radiative properties using the TSI 3563 integrating nephelometer, Aerosol Sci. Tech., 29, 57–69, 1998. 3. Aryal, R., Terman, P., and Voss, K. J.: Comparison of two filter-based reflectance methods to measure the light absorption by atmospheric aerosols, J. Atmosph. Ocean. Tech., accepted, 2014. 4. Bates, T. S., Anderson, T. L., Baynard, T., Bond, T., Boucher, O., Carmichael, G., Clarke, A., Erlick, C., Guo, H., Horowitz, L., Howell, S., Kulkarni, S., Maring, H., McComiskey, A., Middlebrook, A., Noone, K., O'Dowd, C. D., Ogren, J., Penner, J., Quinn, P. K., Ravishankara, A. R., Savoie, D. L., Schwartz, S. E., Shinozuka, Y., Tang, Y., Weber, R. J., and Wu, Y.: Aerosol direct radiative effects over the northwest Atlantic, northwest Pacific, and North Indian Oceans: estimates based on in-situ chemical and optical measurements and chemical transport modeling, Atmos. Chem. Phys., 6, 1657–1732, https://doi.org/10.5194/acp-6-1657-2006, 2006. 5. Bergin, M. H., Schwartz, S. E., Halthore, R. N., Ogren, J. A., and Hlavka, D. L.: Comparison of aerosol optical depth inferred from surface measurements with that determined by sun photometry for cloud free conditions at a continental US site, J. Geophys. Res., 105, 6807–6816, 2000.
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