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Formation Mechanisms and Source Apportionments of Airborne Nitrate Aerosols at a Himalayan-Tibetan Plateau Site: Insights from Nitrogen and Oxygen Isotopic Compositions
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-01 , DOI: 10.1021/acs.est.1c03957
Yu-Chi Lin 1, 2, 3 , Yan-Lin Zhang 1, 2, 3 , Mingyuan Yu 1, 2, 3 , Mei-Yi Fan 1, 2, 3 , Feng Xie 1, 2, 3 , Wen-Qi Zhang 1, 2, 3 , Guangming Wu 4 , Zhiyuan Cong 4 , Greg Michalski 5
Affiliation  

Formation pathways and sources of atmosphere nitrate (NO3) have attracted much attention as NO3 had detrimental effects on Earth’s ecosystem and climate change. Here, we measured nitrogen (δ15N-NO3) and oxygen (δ18O-NO3 and Δ17O-NO3) isotope compositions in nitrate aerosols at the Qomolangma station (QOMS) over the Himalayan-Tibetan Plateau (HTP) to quantify the formation mechanisms and emission sources of nitrate at the background site. At QOMS, the enhanced NO3 concentrations were observed in the springtime. The average δ15N-NO3, δ18O-NO3, and Δ17O-NO3 values were 0.4 ± 4.9, 64.7 ± 11.5 and 27.6 ± 6.9‰, respectively. Seasonal variations of isotope ratios at QOMS can be explained by the different emissions and formation pathways to nitrate. The average fractions of NO2 + OH and N2O5 + H2O to nitrate production were estimated to be 43 and 52%, respectively, when the NO3 + hydrocarbon (HC)/dimethyl sulfide (DMS) (NO3 + HC/DMS) pathway was assumed to be 5%. Using stable isotope analysis in the R (SIAR) model, the relative contributions of biomass burning (BB), biogenic soil emission, traffic, and coal combustion to nitrate were estimated to be 28, 25, 24, and 23%, respectively, on yearly basis. By FLEXible PARTicle (FLEXPART) dispersion model, we highlighted that NOx from BB emission over South Asia that had undergone N2O5 + H2O processes enhanced the nitrate concentrations in the springtime over the HTP region.
更新日期:2021-09-21
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