Retrieval of Brown Carbon based on the aerosol complex refractive indices in the winter of Wuhan

Figures & data

Figure 1. The aerosol complex refractive indices in the winter of 2011.

Figure 2. The differences between k(440) and k(670) in the winter of 2011.

Table 1. Complex refractive index values of the components.

Components	Real part	Imaginary part
BC	1.95	0.79
AS	1.53	1.0 × 10^−7
Water	1.33	1.96 × 10^−9
BrC	1.53	0.073/0.0034 (440/670 nm)

Figure 3. The aerosol size distribution on two typical weather conditions.

Figure 4. Volume fraction of four chemical components under two typical weather conditions.

Table 2. Complex refractive index of BrC in the sensitive study.

No.	Different sources	Real part	Imaginary part for 440/670 nm
1	BrC, Kirchstetter, Novakov, and Hobbs (2004)	1.53	0.0730/0.0034
2	BrC, Chen and Bond (2010), 210 °C	1.53	0.0122/0.0013
3	BrC, Chen and Bond (2010), 360 °C	1.53	0.0525/0.0050
4	BrC, Sun, Biedermann, and Bond (2007), WSOC	1.53	0.0232/0.0032
5	BrC, Sun, Biedermann, and Bond (2007), WISOC	1.53	0.1908/0.0131

Figure 5. Sensitivity study on 10 December 2011.

Figure 6. Sensitivity study on 22 December 2011.

Kirchstetter, T. W., T. Novakov, and P. V. Hobbs. 2004. “Evidence That the Spectral Dependence of Light Absorption by Aerosols is Affected by Organic Carbon.” Journal of Geophysical Research: Atmospheres 109 (D21208).

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Sun, H., L. Biedermann, and T. C. Bond. 2007. “Color of Brown Carbon: A Model for Ultraviolet and Visible Light Absorption by Organic Carbon Aerosol.” Geophysical Research Letters 34 (17): 3131.10.1029/2007GL029797

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