MAX-DOAS observations of pollutant distribution and transboundary transport in typical regions of China

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-04-26 DOI:10.1016/j.jes.2024.04.024
Hongmei Ren , Ang Li , Zhaokun Hu , Hairong Zhang , Jiangman Xu , Xinyan Yang , Jinji Ma , Shuai Wang
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Abstract

Studying the spatiotemporal distribution and transboundary transport of aerosols, NO2, SO2, and HCHO in typical regions is crucial for understanding regional pollution causes. In a 2-year study using multi-axis differential optical absorption spectroscopy in Qingdao, Shanghai, Xi'an, and Kunming, we investigated pollutant distribution and transport across Eastern China-Ocean, Tibetan Plateau-Central and Eastern China, and China-Southeast Asia interfaces. First, pollutant distribution was analyzed. Kunming, frequently clouded and misty, exhibited consistently high aerosol optical depth throughout the year. In Qingdao and Shanghai, NO2 and SO2, as well as SO2 in Xi'an, increased in winter. Elevated HCHO in summer in Shanghai and Xi'an, especially Xi'an, suggests potential ozone pollution issues. Subsequently, pollutant transportation across interfaces was studied. At the Eastern China-Ocean interface, the gas transport flux was the largest among other interfaces, with the outflux exceeding the influx, especially in winter and spring. The input of pollutants from the Tibetan Plateau to central-eastern China was larger than the output in winter and spring, with SO2 having the highest transport flux in winter. The pollution input from Southeast Asia to China significantly exceeded the output, with spring and winter inputs being 3.22 and 3.03 times the output, respectively. Lastly, the transportation characteristics of a pollution event at Kunming were studied. During this period, pollutants were transported from west to east, with the maximum SO2 transport flux at an altitude of 2.87 km equaling 27.74 µg/(m2·s). It is speculated that this pollution was caused by the transport from Southeast Asian countries to Kunming.

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MAX-DOAS 对中国典型地区污染物分布和跨界迁移的观测
研究典型地区气溶胶、二氧化氮、二氧化硫和六氯环己烷的时空分布和跨境传输对了解区域污染成因至关重要。在为期两年的研究中,我们在青岛、上海、西安和昆明使用多轴差分光学吸收光谱,研究了污染物在中国东部-海洋、青藏高原-中国中部和东部以及中国-东南亚界面的分布和传输。首先,分析了污染物的分布。昆明常年云雾缭绕,气溶胶光学深度较高。在青岛和上海,二氧化氮和二氧化硫以及西安的二氧化硫在冬季有所增加。上海和西安(尤其是西安)夏季 HCHO 的升高表明可能存在臭氧污染问题。随后,对污染物跨界面迁移进行了研究。在中国东部-海洋界面,气体迁移通量是其他界面中最大的,流出量超过流入量,尤其是在冬季和春季。青藏高原向中国中东部地区的污染物输入量在冬季和春季大于输出量,其中二氧化硫在冬季的传输通量最大。东南亚对中国的污染输入量明显大于输出量,春季和冬季的输入量分别是输出量的 3.22 倍和 3.03 倍。最后,研究了昆明污染事件的传输特征。在此期间,污染物自西向东传输,在 2.87 千米高度处,二氧化硫的最大传输通量为 27.74 微克/(平方米-秒)。据推测,这种污染是由东南亚国家向昆明的输送造成的。
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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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