Biomass Burning Enhanced the Contribution of Biogenic Sources to Sulfate Aerosol in Subtropical Cities

Description

The original data of water-soluble ions, stable sulfur isotope, stable oxygen isotope, organic carbon, and elemental carbon in PM2.5 over Guangzhou were acquired by Off-line sampling and laboratory analysis. Trace gases and meteorological data in Guangzhou were acquired by online equipment.

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Water-soluble ions were measured by ion chromatography (Metrohm). OC and EC contents were analyzed by thermal-optical carbon analyzer (Sunset Laboratory Inc). Isotopic analysis: The δ34S values (‰) were measured by a DELTA V Advantage isotope ratio mass spectrometer. BaSO4 samples was treated used the diethylenetriaminepentaacetic acid dissolution and re-precipitation methods for determining oxygen isotope (δ18O-SO42-). Meteorological parameters: Temperature, relative humidity, wind speed, and atmospheric pressure were also acquired by a portable weather analyzer (WXT520, Vaisala, Finland). Trace gas: concentrations of trace gases (NO2, SO2, O3, and CO) were acquired from online equipment located at the sampling site. The online equipment included a gas filter analyzer (Thermo Scientific, Model 48i) to measure CO, a pulse fluorescence analyzer (Thermo Scientific, Model 43iTLE) to measure SO2 and O3, and a chemiluminescence apparatus (Thermo Scientific, Model 42iTL) to measure NO2. Sulfate sources were apportioned by ISO source model combined with δ34S values.

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