Strong Impacts of Legitimate Open Burning on Brown Carbon Aerosol in Northeast China,Environmental Science & Technology Letters

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Strong Impacts of Legitimate Open Burning on Brown Carbon Aerosol in Northeast China
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2021-06-07 , DOI: 10.1021/acs.estlett.1c00352
Yuan Cheng ₁ , Qin-qin Yu ₁ , Xu-bing Cao ₁ , Cai-qing Yan ₂ , Ying-jie Zhong ₁ , Zhen-yu Du ₃ , Lin-lin Liang ₄ , Wan-li Ma ₁ , Hong Qi ₁ , Mei Zheng ₅ , Jiu-meng Liu ₁

Affiliation

The massive agricultural sector in Northeast China results in a huge amount of crop residues, which have long been disposed mainly through “illegal” open burning. A transition of local policy occurred in 2018, with a window of approximately 3 months issued for agricultural fires. Here, we investigated the responses of brown carbon (BrC) to the new policy. Persistently high levels of BrC mass (estimated as methanol-soluble organic carbon) and absorption coefficient were observed during the “legitimate burning” period. Agricultural fires, the major driver responsible for the elevated BrC levels, were found to be distinctive with relatively low combustion efficiencies and resulted in BrC with less light absorptivity, compared to residential burning of crop residues. The agricultural fire emissions also led to overestimation of elemental carbon (EC) mass, by a factor of up to 1.6. This in turn resulted in substantial underestimation of f_BrC/EC, the fraction of solar energy absorbed by BrC relative to EC. This study indicates that the new open burning policy could not be considered successful with respect to either air quality improvement or climate change mitigation.

中文翻译：

东北地区合法露天燃烧对褐碳气溶胶的强烈影响

东北地区庞大的农业部门造成了大量的农作物秸秆，长期以来主要通过“非法”露天焚烧进行处置。地方政策的转变发生在 2018 年，针对农业火灾的窗口期约为 3 个月。在这里，我们调查了褐碳 (BrC) 对新政策的反应。在“合法燃烧”期间观察到持续高水平的 BrC 质量（估计为可溶于甲醇的有机碳）和吸收系数。农业火灾是导致 BrC 水平升高的主要驱动因素，被发现具有相对较低的燃烧效率，与作物残留物的住宅燃烧相比，导致 BrC 的光吸收率较低。农业火灾排放还导致元素碳 (EC) 质量的高估，高达 1.6 倍。这反过来导致严重低估了f _BrC/EC，BrC 吸收的太阳能相对于 EC 的比例。这项研究表明，新的露天焚烧政策在改善空气质量或减缓气候变化方面都不能被认为是成功的。

更新日期：2021-06-07

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