A Study on Biogenic Volatile Organic Compounds Emission Inventory for Sichuan Basin, China

Abstract:

This study presents the first spatiotemporal biogenic volatile organic compounds(BVOCs) emission inventory for Sichuan Basin, China. In the basin region, there are 17 cities altogether, including the province city Chengdu. By applying the leaf biomass, emission factor and the meteorological variables, the BVOCs emissions were estimated. The leaf biomasses for different vegetation species were deduced from the local forest volume data, leaf biomass density data, the relevant statistic data combining with the local vegetation distribution data. The emission factor mainly cited from the domestic research. The meteorological variables were simulated by the WRF model. The inventory showed that in the year of 2012,the emission of BVOCs was 487kt in Sichuan Basin,of which isoprene contributes about 64% (314kt), monoterpenes and other VOCs both 18 %(85kt).Mianyang city emitted 121kt in 2012,being the largest contributor, followed by Guangyuan city(110kt).The average emission intensity of BVOCs in the Basin was 2.63 t/km2,the high intensity region mainly distributed around the basin edge. We compared the inventory result with the other studies, indicating the emissions of BVOCs in the Sichuan Basin were within a reasonable range.