Fig. 2: A conceptual model for WS-BrC/OC vs. EC during aerosol transport. | npj Climate and Atmospheric Science

Fig. 2: A conceptual model for WS-BrC/OC vs. EC during aerosol transport.

From: Combined influences of sources and atmospheric bleaching on light absorption of water-soluble brown carbon aerosols

Fig. 2: A conceptual model for WS-BrC/OC vs. EC during aerosol transport.

Relationship between WS-BrC-to-OC ratios and EC concentrations in PM2.5 over East Asia (a) and South Asia (b): inter-site comparison over E. and S. Asia as well as the convergence of overall trends from the continental emission source areas to the ocean background receptor sites. A conceptual model function (equation (11) in Supplementary Note 2) is fitted to WS-BrC-to-OC ratios vs. EC loadings, with asymptotic C/D values being 0.30 for E. Asia (k = 0.83; root-mean-square deviation (RMSD) of 0.09) and 0.28 for S. Asia (k = 0.92; RMSD of 0.15). These asymptotic C/D values indicate their typical characteristics of fresh aerosol in the corresponding emission source regions. a All data measured from simultaneously collected PM2.5 samples in January 2014. b Concentration data for winter S. Asia (e.g., urban Delhi: central Indo-Gangetic Plain (IGP); IGP outflow site BCOB: Bangladesh Climate Observatory at Bhola; Indian Ocean regional receptor MCOH: Maldives Climate Observatory at Hanimaadhoo) in 2016 from earlier study39. Error bars in panels (a) and (b) denote the average values with s.d. for each site.

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