TY - JOUR
T1 - Enhanced sulfate formation in mixed biomass burning and sea-salt interactions mediated by photosensitization
T2 - effects of chloride, nitrogen-containing compounds, and atmospheric aging
AU - Tang, Rongzhi
AU - Ma, Jialiang
AU - Zhang, Ruifeng
AU - Cui, Weizhen
AU - Qin, Yuanyuan
AU - Chu, Yangxi
AU - Qin, Yiming
AU - Vogel, Alexander L.
AU - Chan, Chak K.
N1 - Publisher Copyright:
© 2025 Rongzhi Tang et al.
PY - 2025/1/13
Y1 - 2025/1/13
N2 - Discrepancies persist between modeled simulations and measured sulfate concentrations in the marine boundary layer, especially when the marine air is influenced by biomass burning plumes. However, there has been a notable dearth of research conducted on the interactions between sea-salt aerosol and biomass burning plumes, impeding a comprehensive understanding of sulfate formation. This work studied sulfate formation by mixing real biomass burning (BB) extracts and NaCl, mimicking internal mixtures of BB and sea-salt particles. BB-NaCl particles had a significantly higher sulfate formation rate than incense burning (IS)-NaCl particles. For fresh particles, the sulfate formation rate followed the trend of corn straw (CS)-NaCl > rice straw (RS)-NaCl > wheat straw (WS)-NaCl > IS-NaCl. The filter sample aging was achieved by exposure to OHg generated from UV irradiation. After aging, RS-NaCl particles exhibited the highest enhancement in sulfate formation rates among all the BB-NaCl particles due to interactions between RS and NaCl. Bulk aqueous experiments spiked with NaCl using mixtures of model photosensitizers (PSs) and nitrogen-containing organic compounds (NOCs), pyrazine (CHN), and 4-nitrocatechol (CHON) revealed positive effects of chloride in the PS-CHON system and negative effects in the PS-CHN system in sulfate formation. Our work suggests that BB reaching or near coastal areas can affect sulfate formation via photosensitizer-mediated reactions, potentially exacerbating air pollution.
AB - Discrepancies persist between modeled simulations and measured sulfate concentrations in the marine boundary layer, especially when the marine air is influenced by biomass burning plumes. However, there has been a notable dearth of research conducted on the interactions between sea-salt aerosol and biomass burning plumes, impeding a comprehensive understanding of sulfate formation. This work studied sulfate formation by mixing real biomass burning (BB) extracts and NaCl, mimicking internal mixtures of BB and sea-salt particles. BB-NaCl particles had a significantly higher sulfate formation rate than incense burning (IS)-NaCl particles. For fresh particles, the sulfate formation rate followed the trend of corn straw (CS)-NaCl > rice straw (RS)-NaCl > wheat straw (WS)-NaCl > IS-NaCl. The filter sample aging was achieved by exposure to OHg generated from UV irradiation. After aging, RS-NaCl particles exhibited the highest enhancement in sulfate formation rates among all the BB-NaCl particles due to interactions between RS and NaCl. Bulk aqueous experiments spiked with NaCl using mixtures of model photosensitizers (PSs) and nitrogen-containing organic compounds (NOCs), pyrazine (CHN), and 4-nitrocatechol (CHON) revealed positive effects of chloride in the PS-CHON system and negative effects in the PS-CHN system in sulfate formation. Our work suggests that BB reaching or near coastal areas can affect sulfate formation via photosensitizer-mediated reactions, potentially exacerbating air pollution.
UR - http://www.scopus.com/inward/record.url?scp=85215319666&partnerID=8YFLogxK
U2 - 10.5194/acp-25-425-2025
DO - 10.5194/acp-25-425-2025
M3 - Article
AN - SCOPUS:85215319666
SN - 1680-7316
VL - 25
SP - 425
EP - 439
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
IS - 1
ER -