Temporal and spatial variation of tropospheric NO2 based on satellite remote sensing in Gansu Province
MA chao1, JU Tian-zhen1, WEN Fei2, WANG Qin-hua3, LI Feng-shuai1, ZHANG Yong-jia1, ZHANG Guo-qiang1
1. College of Geography and Environmental Sciences, Northwest Normal University, Lanzhou 730070, China;
2. GansuInstitute of Environmental Sciences, Lanzhou 730070, China;
3. Information Center, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730070, China
Based on the NO2 column concentration data retrieved from OMI satellite remote sensing, the temporal and spatial changes of tropospheric NO2 column concentration and related influencing factors in Gansu Province in the past 11 years were analyzed. And the HYSPLIT model was used to explore the source of atmospheric pollutants. In terms of spatial distribution, the NO2 column concentration showed a decreasing trend from the northeast to the southwest in Gansu, and the highest values were mainly distributed in the entire of Qingyang City and a small part of Pingliang City. The NO2 column concentration value had continuously increased to the highest from 2008 to 2014, and the high value area had gradually expanded; The concentration of NO2 column fluctuated from 2015 to 2018, and it showed a decreasing trend toward the surrounding area, however, the range of the high value area narrowed in the same term. In terms of temporal distribution, the NO2 column concentration in tropospheric showed an upward trend from 2008 to 2018. The seasonal mean distribution were:summer > spring > autumn > winter; the NO2 column concentration peaked from June to August every year, and it started to decline after September, and the lowest point appeared during the year from December to February of the following year. Natural factors contributed the most to the NO2 column concentration in the study area. High temperature and precipitation were conducive to NO2 emissions from the soil. However, vegetation coverage had a certain effect on reducing NO2 concentration.Using the HYSPLIT model, it can be concluded that in July of each year from 2009 to 2018, the external transport route of NO2 in Qingyang was mainly towards Shanxi.
马超, 巨天珍, 温飞, 王勤花, 李逢帅, 张永佳, 张国强. 基于甘肃省卫星遥感的对流层NO2时空变化[J]. 中国环境科学, 2020, 40(3): 956-966.
MA chao, JU Tian-zhen, WEN Fei, WANG Qin-hua, LI Feng-shuai, ZHANG Yong-jia, ZHANG Guo-qiang. Temporal and spatial variation of tropospheric NO2 based on satellite remote sensing in Gansu Province. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 956-966.
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