Typical summertime isoprene emission from vegetation in the Pearl River Delta region, China
Abstract
Images from the Chinese Brazil Earth Resources Satellite (CBERS) were interpreted using a supervised classification method, to detect the fractions of plant function types (PFTs) in the Pearl River Delta (PRD) region. The Model of Emissions of Gases and Aerosols from Nature (MEGAN) was used in conjunction with new PFT maps to estimate isoprene emissions for a typical summer day in the PRD. The preliminary results reveal: (1) the total isoprene emission is 1.73×106 kg; (2) isoprene emission has a marked diurnal cycle and the highest emission occurred at 14:00 local time with a maximum value of 2.39×105 kg; (3) isoprene emission displays large differences in its spatial distribution. The average emission rates of Guangzhou, Jiangmen, and Huizhou are 4580 g·km-2·h-1, 4250 g·km-2·h-1 and 4130 g·km-2·h-1, respectively, which represent the three highest values in the PRD. Jiangmen and Huizhou are the two cities with the highest emissions in the PRD and have total isoprene emissions of 4.60×105 kg and 4.29×105kg, respectively; and the contributions of the two cities to the total regional emission are about 26.6% and 24.8%.
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