Longer Lifetime of BC from Fossil Fuel Combustion than from Biomass Burning: Δ¹⁴C Evidence.

ABSTRACT: Black carbon (BC) significantly contributes to atmospheric warming and glacier melting. However, the atmospheric lifetime of BC from different fuel sources remains poorly constrained. By analyzing Δ¹⁴C of BC in PM_2.5 and precipitation samples collected for three years at a remote site in the Tibetan Plateau, we found that BC from fossil fuel contribution (f_fossil BC) in PM_2.5 exhibited greater seasonal variation than those from South Asia and emission inventories. Precipitation-induced fractionation between fossil fuel combustion-derived BC (BC_ff) and biomass burning-derived BC (BC_bb) resulted in an increase of f_fossil BC to 68 ± 7% during the wet monsoon season, which is significantly higher than le

SUBMITTER: Li C 

PROVIDER: S-EPMC11912310 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature