Core Viewpoint - Air pollution is a global environmental issue with significant impacts on air quality, climate, ecosystems, and human health. China's severe smog pollution, characterized by high PM2.5 concentrations, has shown improvement since 2013 due to regulatory measures [2][3]. Group 1 - The unique formation mechanism of smog in China involves both high-intensity primary pollutant emissions and efficient secondary transformation processes [2][3]. - The current stage in China is marked by a mix of agricultural and industrial societies, leading to high emissions of secondary aerosol precursors from various sources, including ammonia from agricultural activities and nitrogen oxides from industrial activities [3][4]. - A recent review published in the journal Science highlights the complex interactions of multiple atmospheric factors contributing to the unique formation mechanism of secondary organic aerosols (SOA) in urban China [4][10]. Group 2 - Despite significant progress in environmental pollution control over the past decade, uncertainties remain regarding the precursors, formation processes, and impacts of SOA on radiation budgets and human health in Chinese cities [6][9]. - The substantial decrease in PM2.5 concentrations in urban China has led to a significant increase in ground-level ozone concentrations, which facilitates SOA formation [6][9]. - Understanding the sensitivity of ozone-nitrogen oxides-volatile organic compounds in urban areas is crucial for developing economically effective strategies to control precursors that lead to high concentrations of both SOA and ozone [6][9]. Group 3 - The study identifies that high atmospheric oxidation capacity in winter results from various factors, including high concentrations of gas-phase nitrous acid photolysis and nitrogen oxides participating in olefin ozonolysis [7][9]. - The increase in nitrate proportions has also enhanced the liquid water content of aerosols, further promoting the generation of liquid-phase SOA [7][9]. - Future research should focus on exploring unknown oxidation pathways, characterizing precursors and multi-generation oxidation products at the molecular level, and understanding the corresponding generation and aging mechanisms [7][9]. Group 4 - The paper summarizes the scientific status of SOA formation in urban China, emphasizing the dominant role of anthropogenic precursors, the main mechanisms of SOA formation, and the importance of multi-pollutant and multiphase processes in SOA evolution [9][10]. - This research deepens the understanding of the formation mechanisms of haze pollution in China and provides a reference for global atmospheric pollution studies, offering important scientific basis for future air pollution control and policy-making [10].

耕地扩张使SOA净降温作用减少11%。在未来气候变暖与空气污染减轻的情景下，相同耕地扩张的 增温效应将比当前增强约50%。 该研究首次系统揭示了，耕地扩张通过削弱"降温屏障"加剧全球变暖的新机制。傅平青说："这项 研究警示我们，在制定粮食安全与气候政策时，必须同时考虑土地利用变化对'碳账本'和'气溶胶降温 账'的双重影响。" 研究建议，保护和恢复森林生态系统不仅能固碳，还能维持重要的SOA自然降温功能，这一"非 碳"效益在未来气候变暖背景下将愈发珍贵。该成果为国家制定碳中和战略和土地科学管理的协同政策 提供了重要科学依据，也为全球气候变化的预测和应对提供了新思路。 记者7月28日从天津大学获悉，该校教授朱佳雷、傅平青联合清华大学教授张强等，采用包含自主 研发模块的地球系统模型，首次在全球范围内系统分析了工业革命以来农田扩张对二次有机气溶胶 （SOA）及其气候效应的影响。该研究揭示了人类农业活动如何通过改变土地覆盖，影响大气成分和气 候变化。研究成果近日发表在国际地学顶级期刊《自然·地球科学》上。 据介绍，工业革命以来，为满足粮食需求，全球森林和草地大规模转为农田。传统研究主要关注这 种转变对碳储存、反照率和水 ...