Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Language: Английский

Reactive Oxidized Nitrogen at a High Mountain Site in the North China Plain: Chemical Speciation and Temporal Variations During 2007–2023 DOI
Likun Xue, Ying Jiang, Hongyong Li

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(7)

Published: April 8, 2025

Abstract Total reactive oxidized nitrogen (NO y ) and its speciated compounds, such as nitric oxide (NO), dioxide 2 ), peroxyacetyl nitrate (PAN), particulate (pNO 3 − play a major role in tropospheric chemistry, regional air quality, climate change. However, little is known regarding the chemical speciation long‐term trends of NO China. In this study, we analyzed temporal variations compounds during eight intensive field campaigns 6 years continuous measurements 2007–2023 at Mount Tai North China Plain (NCP). The measured concentration levels were significantly higher than those other remote high‐altitude sites globally. was most abundant species (24%–42%), followed by pNO (18%–34%) PAN (7%–12%). Over study period, concentrations x , z exhibited significant downward trend, while upward trend. Vertical transport from planetary boundary layer (PBL) substantially influences atmosphere Tai, with masses both PBL free troposphere containing different compositions . lower above NCP contained relatively high abundances This represents first comprehensive analysis decadal China's atmosphere. Our findings underscore necessity for additional efforts to mitigate photochemical secondary aerosol pollution caused altitudes

Language: Английский

Citations

0
Characteristics of the Long-Term Variations in Sulfate–Nitrate–Ammonium Aerosols in a Coastal City in Northern China—Interpretability Analysis from a Machine Learning Perspective DOI

Jianbin Huang,

Xiaoyun Zhang,

Yuanzhe Ni

et al.

Atmospheric Environment, Journal Year: 2025, Volume and Issue: unknown, P. 121245 - 121245

Published: April 1, 2025

Language: Английский

Citations

0
Sources and formation characteristics of particulate nitrate in the Pearl River Delta region of China: Insights from three-year online observations DOI
Jisheng Zhang, Zheng Zong,

Chenglei Pei

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 945, P. 174107 - 174107

Published: June 20, 2024

Language: Английский

Citations

1
Rising Alkali-to-Acid Ratios in the Atmosphere May Correspond to Increased Aerosol Acidity DOI
Guangjie Zheng, Hang Su,

Ruilin Wan

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(37), P. 16517 - 16524

Published: Sept. 4, 2024

Aerosol acidity (or pH) is one central parameter in determining the health, climate, and ecological effects of aerosols. While it traditionally assumed that long-term aerosol pH levels are determined by relative abundances atmospheric alkaline to acidic substances (referred as

Language: Английский

Citations

1
Insights into relationship of oxidative potential of particles in the atmosphere and entering the human respiratory system with particle size, composition and source: A case study in a coastal area in Northern China DOI
Ruiyu Li, Caiqing Yan, Yingze Tian

et al.

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 485, P. 136842 - 136842

Published: Dec. 10, 2024

Language: Английский

Citations

1
A systematic review of reactive nitrogen simulations with chemical transport models in China DOI
Haoran Zhang,

Xueyu Zhou,

Chuanhua Ren

et al.

Atmospheric Research, Journal Year: 2024, Volume and Issue: 309, P. 107586 - 107586

Published: July 14, 2024

Language: Английский

Citations

1
Measurement report: Impact of cloud processes on secondary organic aerosols at a forested mountain site in southeastern China DOI Creative Commons
Zijun Zhang,

Weiqi Xu,

Yi Zhang

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(14), P. 8473 - 8488

Published: July 29, 2024

Abstract. Aerosol particles play critical roles in climate and human health. However, aerosol composition evolution, particularly secondary organic (SOA), interactions with clouds high-altitude background areas China remain less understood. Here, we conducted real-time measurements of submicron aerosols (PM1) using mass spectrometers at a forested mountain site (1128 m a.s.l.) southeastern November 2022. The average (±1σ) PM1 concentration was 4.3±4.8 µg m−3, which ubiquitously lower than that other sites China. Organic (OA) constituted the largest fraction (42.9 %) predominantly secondary, as indicated by high oxygen-to-carbon (O / C) ratio (0.85–0.96) carbon oxidation state (0.21–0.49). Notably, remarkably enhanced concentrations observed during daytime on cloudless days were identified to be likely produced from cloud evaporation. While more oxidized oxygenated OA scavenged efficiently events, evaporation found release significant amount air masses transported polluted regions. distinct decrease ΔCO increase O C evaporative period further demonstrates remaining droplets is generally moderate state. Moreover, nitrates also estimated showed higher contribution total nitrate cloudy (27 (3 %). Overall, our results demonstrate importance SOA influences processes regional

Language: Английский

Citations

1
Multiphase interactions between sulfur dioxide and secondary organic aerosol from the photooxidation of toluene: Reactivity and sulfate formation DOI
Qing Ye, Min Yao,

Wei Wang

et al.

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 168736 - 168736

Published: Nov. 21, 2023

Language: Английский

Citations

1
Nitrate-Photolysis Shortens the Lifetimes of Brown Carbon Tracers from Biomass Burning DOI
Yi Liu, Ru‐Jin Huang, Chunshui Lin

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 27, 2024

Biomass burning is an important source of brown carbon (BrC) aerosols, which influence climate by affecting the Earth's radiative balance. However, transformation pathways BrC chromophores, especially in presence photochemically active species, such as nitrate, are not well understood. In this study, nitrate-mediated aqueous-phase photooxidation three typical chromophores from biomass was investigated, including 4-nitrocatechol, 3-nitrosalicylic acid, and 3,4-dinitrophenol. Variations nitrate concentrations, pH, temperatures were systematically examined to assess their impacts on apparent photolysis rates these chromophores. The results show that increasing concentrations significantly enhances 3–3.5 times compared nitrate-free conditions. Also, a temperature rise 0 30 °C increases factor 1.3–2.5 for effect pH varies among depending substituents positions benzene ring. High-resolution mass spectrometric analysis suggests initiates with addition nitro and/or hydroxyl groups ring, followed ring-opening reaction formation smaller, highly oxygenated molecules formic glyoxylic malonic nitropropanoic acid. This study highlights key role BrC, altering aging shortening atmospheric lifetimes BrC. These particular importance better understanding its forcing, given increase fraction aerosols China recent years.

Language: Английский

Citations

0