High summer background O3 levels in the desert of northwest China

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Xinbing Ren , Fang Wang , Bayi Wu , Shaoting Zhang , Lei Zhang , Xingjun Zhou , Yuanzhe Ren , Yongjing Ma , Feng Hao , Yongli Tian , Jinyuan Xin
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引用次数: 0

Abstract

Generally speaking, the precursors of ozone (O3), nitrogen oxides and volatile organic compounds are very low in desert areas due to the lack of anthropogenic emissions and natural emissions, and thus O3 concentrations are relatively low. However, high summer background concentrations of about 100 µg/m3 or 60 ppb were found in the Alxa Desert in the highland of northwest China based on continuous summer observations from 2019 to 2021, which was higher than the most of natural background areas or clean areas in world for summer O3 background concentrations. The high O3 background concentrations were related to surface features and altitude. Heavy-intensity anthropogenic activity areas in desert areas can cause increased O3 concentrations or pollution, but also generated O3 depleting substances such as nitrous oxide, which eventually reduced the regional O3 baseline values. Nitrogen dioxide (NO2) also had a dual effect on O3 generation, showing promotion at low concentrations and inhibition at high concentrations. In addition, sand-dust weather reduced O3 clearly, but O3 eventually stabilized around the background concentration values and did not vary with sand-dust particulate matter.

中国西北沙漠地区夏季背景臭氧浓度较高
一般来说,由于缺少人为排放和自然排放,沙漠地区的臭氧(O3)前体物、氮氧化物和挥发性有机物含量很低,因此O3浓度相对较低。然而,根据2019年至2021年的夏季连续观测,发现中国西北高原阿拉善沙漠的夏季本底浓度较高,约为100微克/立方米或60ppb,高于世界上大多数自然本底地区或清洁地区的夏季O3本底浓度。高臭氧本底浓度与地表特征和海拔高度有关。沙漠地区高强度的人为活动会导致臭氧浓度增加或污染,同时也会产生氧化亚氮等消耗臭氧的物质,最终降低区域臭氧基线值。二氧化氮(NO2)对 O3 的生成也有双重影响,低浓度时有促进作用,高浓度时有抑制作用。此外,沙尘天气明显降低了臭氧浓度,但臭氧浓度最终稳定在背景浓度值附近,并不随沙尘颗粒物的变化而变化。
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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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