Extended Data Fig. 6: Characteristics of solid-fuel POA and the impact of biomass burning and coal combustion.
From: Substantial contribution of transported emissions to organic aerosol in Beijing
a–h, Comparison between solid-fuel POA (SFOAday+SFOAnight) (FIGAERO-CIMS OA data) to the sum of biomass burning and coal combustion POA resolved (ToF-ACSM) (daily means). During winter CCOA dominates SFOA at low and BBOA dominates at high SFOA (or BBOA+CCOA) concentrations. During the warm season, the ToF-ACSM based estimate (BBOA+CCOA, related to mostly BBOA) is larger than the FIGAERO-CIMS based estimated (SFOA). The chemical composition is displayed as Kendrick mass defect plots of the neutral compound with CH2 base. Compounds that are at least 10% of the maximum compound intensity are size-coded with the compound’s intensity normalized to the highest intensity compound and are color-coded with compound families: CxHyOz: red, CxHyOzNr: blue, CxHyOzSr: yellow, other: grey. Compounds with an intensity between 5 and 10% of the maximum compound intensity are shown as small unisized solid grey dots (others are not displayed). The seasonal variation is shown as daily mean concentrations and the diurnal variation as median diel cycles.
