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

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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 NO_x 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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