Isotopic characterization of aerosol organic carbon components over the eastern United States

TitleIsotopic characterization of aerosol organic carbon components over the eastern United States
Publication TypeJournal Article
Year of Publication2012
AuthorsWozniak, AS, Bauer, JE, Dickhut, RM, Xu, L, McNichol, AP
JournalJournal of Geophysical Research-Atmospheres
Volume117
PaginationD13303-D13303
ISSN0148-0227
Abstract

Carbon isotopic signatures (delta C-13, Delta C-14) of aerosol particulate matter total organic carbon (TOC) and operationally defined organic carbon (OC) components were measured in samples from two background sites in the eastern U. S. TOC and water-soluble OC (WSOC) delta C-13 values (-27 to -24 parts per thousand) indicated predominantly terrestrial C-3 plant and fossil derived sources. Total solvent extracts (TSE) and their aliphatic, aromatic, and polar OC components were depleted in delta C-13 (-30 to -26 parts per thousand) relative to TOC and WSOC. Delta C-14 signatures of aerosol TOC and TSE (-476 to +25 parts per thousand) suggest variable fossil contributions (similar to 5-50%) to these components. Aliphatic OC while comprising a small portion of the TOC (

DOI10.1029/2011JD017153