Estimation of biogenic VOCs emissions in Eastern China based on remote sensing data
基于遥感资料的中国东部地区植被VOCs排放强度研究

In order to study emission features of biogenic VOCs(BVOCs) in Eastern China,the widely-used model of emissions of gases and aerosols from nature(MEGAN) was adopted.Recent information on leaf area index(LAI) and leaf biomass density of vegetations were based on the remote sensing data.Up-to-date observations on emission factors were investigated from literature.Based on average conditions of vegetation and meteorology between the year 2008 and 2010,hourly biogenic emissions of BVOCs in eastern China were calculated,with spatial grid resolution of 10 km.The results showed that the total amount BVOCs emissions was 11.3×106 t(C),with isoprene(ISOP),monoterpene(MON) and other VOC(OVOC) accounting for 44.9%、31.5%,and 23.6%,respectively.Seasonal variations were significant,and contributions of spring,summer,autumn and winter to the yearly total were 11.2%,71.8%,14.1% and 3.0%,respectively.High emission intensities were usually found in Xing’an Mountain,Changbai Mountain,Qinling-Daba Mountain and southern hilly areas,generally between 1500 and 6500 kg · km-2 · a-1.Both total amount and intensities of emissions from provinces of Fujian,Guangdong,Jiangxi,Zhejiang,Hunan and Hubei are relatively high.Attentions should be paid on the interactions between BVOCs and anthropogenic pollutants(e.g.,nitrogen oxides) in these areas.The inventory of BVOCs emissions achieved in this study is an important groundwork for environmental and climate modeling.