CARTEL, Université de Sherbrooke, Sherbrooke, Québec, Canada
Received: 06 Aug 2008 – Discussion started: 06 Jan 2009
Abstract. It is pointed out that the graphical, aerosol classification method of Gobbi et al. (2007) can be interpreted as a manifestation of fundamental analytical relations whose existance depends on the simple assumption that the optical effects of aerosols are essentially bimodal in nature. The families of contour lines in their "Ada" curvature space are essentially empirical and discretized illustrations of analytical parabolic forms in (α, α') space (the space formed by the continuously differentiable Angstrom exponent and its spectral derivative).
Revised: 14 Sep 2010 – Accepted: 08 Oct 2010 – Published: 25 Oct 2010
O'Neill, N. T.: Comment on "Classification of aerosol properties derived from AERONET direct sun data" by Gobbi et al. (2007), Atmos. Chem. Phys., 10, 10017-10019, doi:10.5194/acp-10-10017-2010, 2010.