Remote sensing monitoring of tropospheric HCHO column concentration and influential factors over pearl river delta, China
XIAN Long1, GE Jian-tuan1,2, XU Min3, CHEN Xue-ping1, WANG Shuang1, XIE Shun-tao1, HU Wen-wen4
1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;
2. Jiayuguan City Government, Jiayuguan 735100, China;
3. College of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
4. Heshui County Environmental Protection Agency, Qingyang 745400, China
Satellite remote Sensing data Retrieval based on OMI, the temporal and spatial distribution characteristics of formaldehyde column concentration in the troposphere and its influencing factors in the Pearl River Delta region from 2009 to 2016were studied. The results show that the concentration change of formaldehyde column in the Pearl River Delta was characterized by fluctuations in the past 8years, with an average annual value of 13.11×1015 molec/cm2, the lowest value appeared in 2012 and the highest value appeared in 2016, the maximum reduction rate was 5.8%, the maximum growth rate was 6.3%. The highest in summer and the lowest in winter, the order was summer > autumn > spring > winter, and the monthly variation of formaldehyde in 8a to 96months was larger, showing a single peak structure, with the highest in June every year; The spatial variation was characterized by:The concentration of formaldehyde column decreases from northwest to southeast. Among them, the distribution center of the northeastern part of Zhaoqing, the northern part of Foshan and the western part of Guangzhou constitutes the distribution center of high value area. It consists of the third-level sub-level distribution area in the south-central part of Foshan, the southeastern part of Guangzhou and the northwest half of Jiangmen. In Huizhou, Dongguan, Shenzhen, Zhongshan, Zhuhai and Jiangmen, the coastal areas of the Pearl River Delta are the first-level low-value concentration areas. Meteorological factors such as temperature and pressure affect the formation and distribution of HCHO, and vegetation has a certain contribution to the production of HCHO. There is a positive correlation between the change of formaldehyde column concentration and the factors of economic development, such as automobile ownership, regional GDP, etc, the increase of total energy consumption and total industrial waste gas emission was closely related to the increase of formaldehyde column concentration, and the main reason for the change of formaldehyde column concentration was human factors.
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