Chemical and Light-Absorption Properties of Water-Soluble Organic Aerosols in Northern California and Photooxidant Production by Brown Carbon Components.

ABSTRACT: Atmospheric brown carbon (BrC) can impact the radiative balance of the earth and form photooxidants. However, the light absorption and photochemical properties of BrC from different sources remain poorly understood. To address this gap, dilute water extracts of particulate matter (PM) samples collected at Davis, CA over one year were analyzed using high resolution aerosol mass spectrometry (HR-AMS) and UV-vis spectroscopy. Positive matrix factorization (PMF) on combined AMS and UV-vis data resolved five water-soluble organic aerosol (WSOA) factors with distinct mass spectra and UV-vis spectra: a fresh and an aged water-soluble biomass burning OA (_WSBBOA_fresh and _WSBBOA_aged) and three oxygenated OA (_WSOOAs). _WSBBOA_fresh<

SUBMITTER: Jiang W 

PROVIDER: S-EPMC10202033 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature