Supplementary Information.
SI text
Numerous studies reporting that light absorbing aerosols consist of elemental carbon (EC),
organic carbon (OC), and mineral dust (MD) (Moosmuelleret al. 2009).
The mass absorption efficiency, 𝑖 , determined by mass concentrations of the PM2.5
components, 𝑚𝑖 , as:
𝑖 =
𝑏𝑎𝑏𝑠
(1)
𝑚𝑖
where the 𝑖 refers to EC, OC, and MD.
𝑏𝑎𝑏𝑠 = 𝑖 ∗ 𝑚𝑖
(2)
The objective of the multiple linear regression analysis is to find 𝐸𝐶 , 𝑂𝐶 , and𝑀𝐷 by fitting the
𝑏𝑎𝑏𝑠 into a multiple linear regression equation as given below.
𝑏𝑎𝑏𝑠 = 𝐸𝐶 ∗ 𝑚𝐸𝐶 + 𝑂𝐶 ∗ 𝑚𝑂𝐶 + 𝑀𝐷 ∗ 𝑚𝑀𝐷 (3)
where 𝑚𝐸𝐶 , 𝑚𝑂𝐶 , and 𝑚𝑀𝐷 represents mass concentrations of EC, OC and mineral dust (MD),
respectively, and 𝐸𝐶 , 𝑂𝐶 , and 𝑀𝐷 are mass absorption efficiency of EC, OC and MD,
respectively.As the Asian Dust event was not observed during the sampling period, the light
absorption caused by mineral dust was excluded in this study. Hence, the equation is simplified
into:
𝑏𝑎𝑏𝑠 = 𝐸𝐶 ∗ 𝑚𝐸𝐶 + 𝑂𝐶 ∗ 𝑚𝑂𝐶
(4)
The equation would give the 𝐸𝐶 and 𝑂𝐶 as retrieved output parameters for each wavelength.
For instance; the 𝐸𝐶 and 𝑂𝐶 at =550nmwereretrievedby multi linear regression analysis as
10.1 m2 g-1 and 0.5 m2 g-1, respectively. Thus, Eq.5 was re-written as;
𝑏𝑎𝑏𝑠 = 10.1 ∗ 𝑚𝐸𝐶 + 0.5 ∗ 𝑚𝑂𝐶
(5)
The correlation coefficients andmean errors of the equation were found to be 0.95 and 0.38 for
EC and 0.93 and 0.16 for OC, respectively.
Figure S1. PM10 concentrations obtained from the 20 network sites that are operated by the Ministry of
Environment in Korea on 12/09/2011, 12/12/2011, and 12/16/2011 (the green circle area refers to the
PM10 concentration) and three-dimensional back trajectory matrix of the air mass at 10:00 am on Dec. 12,
2011 (72 hours); the color bar represents the geographical height (meters). The air mass trajectories
are bounded by lower-left latitude and longitude of 34 and 126 and upper-right latitude and
longitude of 36 and 128.".
Dec.9, 2011
Dec.11, 2011
Dec.10, 2011
Dec.12, 2011
Figure S2. MODIS AOD images during the long-range transport PM event.
Reference
Moosmueller, H., R. K. Chakrabarty and W. P. Arnott. 2009. Aerosol light absorption and its
measurement: A review. J. Quant. Spectro. andRadi. Trans 110(11): 844-878.