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摘要
Based on OMI satellite data and MODIS land cover type products, the temporal and spatial variations of ozone formation sensitivity on different land use types in the Pearl River Delta from 2005 to 2016 were studied. The results show that the land use types (developed, comparatively developed and less-developed areas) established by using MODIS data products were scientific and applicable. The areas where surface ozone is controlled by VOCs-limited regime are mainly located in the central part of the Pearl River Delta, including southern Guangzhou, Foshan, Zhongshan, Shenzhen and parts of Jiangmen. The area proportion of VOCs-limited area has been shrinking, reaching a minimum of 5.05% in 2015, and rose again in 2016. The areas controlled by NOx-limited regime were mainly distributed on the edge of the Pearl River Delta, including northeastern Huizhou, northern Guangzhou, northwestern Zhaoqing and southwestern Jiangmen. The area proportion of NOx-limited area is increasing, reaching a maximum of 42.60% in 2016. The transitional regime area is mainly distributed between VOCs-limited and NOx-limited areas. The ozone sensitivity regimes on different land use types were also analyzed. The results show that the developed areas were mainly under VOCs-limited/transitional regimes; the comparatively developed areas were mainly under transitional regime; the less developed areas were controlled by NOx. According to the interannual variations of the area proportion of ozone sensitivity regimes in different cities, nine cities in the Pearl River Delta can be divided into three categories: the first category, represented by Guangzhou, has a large area and multiple land use types with three ozone sensitivity regimes emerged. The second category, represented by Shenzhen, is concentrated in the central area of the Pearl River Delta with only VOCs/transitional regimes. The third category only consists of Huizhou, with only NOx/transitional regimes.
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