区域高时空分辨率VOC天然源排放清单的建立

Development of Biogenic VOC Emissions Inventory with High Temporal and Spatial Resolution

将中尺度气象模式MM5应用于估算VOC天然源排放的研究 ,建立了高时空分辨率VOC天然源排放清单的估算方法 .根据方法需要 ,确定了我国部分树木排放异戊二烯和萜烯的标准排放因子 ,各植被类型排放各种VOC的标准排放因子 ,以及各植被类型季节平均的叶生物量密度 .应用该方法估算了华南地区满足区域空气质量数值模拟要求的高时空分辨率VOC天然源排放清单 .结果表明 ,华南地区夏季典型日的VOC天然源排放总量约 1 .1 2× 1 0 4 t,VOC排放速率具有明显的时空分布 ,其中地理分布取决于植被类型及其分布 ,日变化规律则依赖于太阳辐射和温度的高低 .

A new method was developed to estimate biogenic VOC emissions with high temporal and spatial resolution by use of Mesoscale Meteorology Modeling System Version5 (MM5). In this method, the isoprene and monoterpene standard emission factors for some types of tree in China were given and the standard VOC emission factors and seasonally average densities of leaf biomass for all types of vegetation were determined. A biogenic VOC emissions inventory in South China was established which could meet the requirement of regional air quality modeling. Total biogenic VOC emissions in a typical summer day were estimated to be 1.12×10 4 metric tons in an area of 729km×729km of South China. The results showed the temporal and spatial distributions of biogenic VOC emission rates in this area. The results also showed that the geographical distribution of biogenic VOC emission rates depended on vegetation types and their distributions and the diurnal variation mainly depended on the solar radiation and temperature. The uncertainties of estimating biogenic VOC emissions were also discussed.