An unexpected catalyst dominates formation and radiative forcing of regional haze.

ABSTRACT: Although regional haze adversely affects human health and possibly counteracts global warming from increasing levels of greenhouse gases, the formation and radiative forcing of regional haze on climate remain uncertain. By combining field measurements, laboratory experiments, and model simulations, we show a remarkable role of black carbon (BC) particles in driving the formation and trend of regional haze. Our analysis of long-term measurements in China indicates declined frequency of heavy haze events along with significantly reduced SO₂, but negligibly alleviated haze severity. Also, no improving trend exists for moderate haze events. Our complementary laboratory experiments demonstrate that SO₂ oxidation is efficiently catalyzed on BC particles in the presence of N

SUBMITTER: Zhang F 

PROVIDER: S-EPMC7049161 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature