Table 1. Aerosol Model Parameters: Volumetric Radius Rv and Standard Deviation sigma (mum) for the Fine (F) and Coarse (C) Fractionsa


	RvF	sigmaF	RvC	sigmaC	nre	nim

East Coast, USA	0.12 + 0.05tau, <- 0.2	0.35 + 0.05tau, <- 0.45	2.8 + 0.4tau, <- 3.2	0.6 + 0.2tau, <- 0.8	1.42 - 0.03tau, 1.45 at tau >1.2	0.0045, 0.002
West Coast, USA	0.16	0.4	2.4	0.6	1.45	0.0055, 0.002
Dust, Solar Village	0.14	2.2	0.5	0.55	1.50	0.0015, 0.0015

aThe real (nre) and imaginary (nim) refractive indices are common for both modes. The first (East Coast) is a dynamic model with parameters depending on aerosol optical thickness at 0.47 mum (tau). The imaginary refractive index is assumed a constant at lambda <0.9 mum (first number), and a linearly decreasing function to its value at lambda = 2.13 mum (second number).