The molecular-level composition of atmospheric HULIS during biomass burning episode

摘要

Atmospheric HUmic-Like Substances (HULIS) are an important fraction of organic aerosols (Feczko et al., 2007; Kiss et al., 2002). They could influence the surface activity and UV-light absorption of aerosols and then play important roles on the formation of cloud condensation nuclei, solar radiation and photochemical processes in the atmosphere (Graber et al., 2006). Field studies suggested that biomass burning (BB) is a major source of HULIS in ambient aerosols (Mayol-Bracero et al., 2002). However, because of their complexity, it is a great challenge to identify the chemical composition. In order to understand the characteristics of HULIS, here we deployed ultrahigh resolution mass spectrometry (obitrap-MS) to analyze the molecular-level composition of HULIS isolated from ambient aerosols during biomass burning episodes.