Dissimilar effects of two El Niño types on PM2.5 concentrations in East Asia

Environmental Pollution
Jaein I JeongSang-Wook Yeh

Abstract

We investigate the effects of natural variability of meteorological fields on surface PM2.5 concentration changes in East Asia during El Niño periods for the past three decades (1980-2014) through GEOS-Chem 3D global chemical transport model simulations. First, our evaluation of the model with anthropogenic emissions for 2006 and a comparison against observations show that the simulated results accurately reproduced the observed spatial distribution of annual mean aerosol concentrations for 2006-2007 including inorganic (sulfate, ammonium, and nitrate) and carbonaceous (organic and black carbon) aerosols in the surface air. Based on the Oceanic Niño Index, the assimilated meteorological data used in the model simulations indicate that 10 El Niño events occurred for the past three decades (1980-2014). We further classified the 10 El Niño events into 6 central Pacific El Niño (C-type) and 4 eastern Pacific El Niño (E-type) to examine the different roles of two El Niño types in determining seasonal surface PM2.5 concentrations in East Asia. We find opposite impacts on the seasonal surface PM2.5 concentrations depending on two El Niño types, such that the surface PM2.5 concentrations during the E-type period are higher than the cli...Continue Reading

Citations

Apr 26, 2020·Environmental Monitoring and Assessment·Pamela B SanguinetiBeatriz M Toselli

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