Chemical composition and light absorption of carbonaceous aerosols emitted from crop residue burning: influence of combustion efficiency

环境化学 燃烧 化学 气溶胶 稻草 总有机碳 作物残渣 吸收(声学) 生物燃料 碳纤维 有机化学 废物管理 农业 材料科学 无机化学 工程类 生态学 复合材料 复合数 生物
作者
Yujue Wang,Min Hu,Nan Xu,Yanhong Qin,Zhijun Wu,Liangwei Zeng,Xin Huang,Lingyan He
出处
期刊:Atmospheric Chemistry and Physics 卷期号:20 (22): 13721-13734 被引量:20
标识
DOI:10.5194/acp-20-13721-2020
摘要

Abstract. Biomass burning is one of the major sources of carbonaceous aerosols, which affects air quality, the radiation budget and human health. Field straw residue burning is a widespread type of biomass burning in Asia, while its emissions are poorly understood compared with wood burning emissions. In this study, lab-controlled straw (wheat and corn) burning experiments were designed to investigate the emission factors and light absorption properties of different biomass burning organic aerosol (BBOA) fractions, including water-soluble organic carbon (WSOC), humic-like substances (HULIS) and water-insoluble organic carbon (WISOC). The influences of biofuel moisture content and combustion efficiency on emissions are comprehensively discussed. The emission factors of PM2.5, organic carbon (OC) and elemental carbon (EC) were 9.3±3.4, 4.6±1.9 and 0.21±0.07 g kg−1 for corn burning and 8.7±5.0, 3.9±2.8 and 0.22±0.05 g kg−1 for wheat burning, generally lower than wood or forest burning emissions. Though the mass contribution of WISOC to OC (32 %–43 %) was lower than WSOC, the light absorption contribution of WISOC (57 %–84 % at 300–400 nm) surpassed WSOC due to the higher mass absorption efficiency (MAE) of WISOC. The results suggested that BBOA light absorption would be largely underestimated if only the water-soluble fractions were considered. However, the light absorption of WSOC in the near-UV range, occupying 39 %–43 % of the total extracted OC absorption at 300 nm, cannot be negligible due to the sharper increase of absorption towards shorter wavelengths compared with WISOC. HULIS were the major light absorption contributors to WSOC, due to the higher MAE of HULIS than other high-polarity WSOC components. The emission levels and light absorption of BBOA were largely influenced by the burning conditions, indicated by modified combustion efficiency (MCE) calculated by measured CO and CO2 in this study. The emission factors of PM2.5, OC, WSOC, HULIS and organic acids were enhanced under lower MCE conditions or during higher moisture straw burning experiments. Light absorption coefficients of BBOA at 365 nm were also higher under lower MCE conditions, which was mainly due to the elevated mass emission factors. Our results suggested that the influence of varied combustion efficiency on particle emissions could surpass the differences caused by different types of biofuels. Thus, the burning efficiency or conditions should be taken into consideration when estimating the influence of biomass burning. In addition, we observed that the ratios of K+/OC and Cl-/OC increased under higher MCE conditions due to the enhancement of potassium and chlorine released under higher fire temperatures during flaming combustion. This indicates that the potassium ion, as a commonly used biomass burning tracer, may lead to estimation uncertainty if the burning conditions are not considered.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
大幅提高文件上传限制,最高150M (2024-4-1)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
小潘完成签到,获得积分10
刚刚
1秒前
as发布了新的文献求助10
1秒前
喜东东发布了新的文献求助10
1秒前
yxx发布了新的文献求助10
1秒前
摇摇七喜完成签到,获得积分10
1秒前
柯柯发布了新的文献求助10
2秒前
3秒前
3秒前
金华发布了新的文献求助10
3秒前
Bodhicia发布了新的文献求助10
4秒前
小芙爱雪碧完成签到 ,获得积分10
4秒前
4秒前
月月发布了新的文献求助10
4秒前
4秒前
4秒前
zhuzhan完成签到,获得积分10
4秒前
Hyux完成签到,获得积分10
4秒前
科研通AI2S应助hh0采纳,获得10
4秒前
迅速寻桃发布了新的文献求助10
5秒前
如意红酒完成签到 ,获得积分10
6秒前
宜醉宜游宜睡应助Jovid采纳,获得10
7秒前
似水流年发布了新的文献求助10
7秒前
田様应助LCC采纳,获得10
7秒前
7秒前
8秒前
炫酷皮皮天完成签到,获得积分10
8秒前
9秒前
zhuzhan发布了新的文献求助10
10秒前
Ma_Cong完成签到,获得积分10
10秒前
skkr发布了新的文献求助10
10秒前
10秒前
柯柯完成签到,获得积分10
11秒前
11秒前
心海完成签到,获得积分10
11秒前
彭于晏应助木木采纳,获得30
12秒前
Rae应助靓丽的飞槐采纳,获得10
12秒前
12秒前
学术laji发布了新的文献求助10
12秒前
简隋英发布了新的文献求助10
12秒前
高分求助中
The late Devonian Standard Conodont Zonation 2000
The Lali Section: An Excellent Reference Section for Upper - Devonian in South China 1500
Nickel superalloy market size, share, growth, trends, and forecast 2023-2030 1000
Smart but Scattered: The Revolutionary Executive Skills Approach to Helping Kids Reach Their Potential (第二版) 1000
Mantiden: Faszinierende Lauerjäger Faszinierende Lauerjäger 800
PraxisRatgeber: Mantiden: Faszinierende Lauerjäger 800
A new species of Coccus (Homoptera: Coccoidea) from Malawi 500
热门求助领域 (近24小时)
化学 医学 生物 材料科学 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 基因 遗传学 催化作用 物理化学 免疫学 量子力学 细胞生物学
热门帖子
关注 科研通微信公众号,转发送积分 3245398
求助须知:如何正确求助?哪些是违规求助? 2889057
关于积分的说明 8256709
捐赠科研通 2557392
什么是DOI,文献DOI怎么找? 1386090
科研通“疑难数据库(出版商)”最低求助积分说明 650285
邀请新用户注册赠送积分活动 626541