Tuesday, 16 January 2007: 2:00 PM
Impacts of Biogenic and Anthropogenic Emissions on Photochemical Oxidants over the Pearl River Delta Region, China
212A (Henry B. Gonzalez Convention Center)
Abstract The rate of biogenic and anthropogenic emissions play an important role in the chemical reactions that control tropospheric oxidant concentrations. The Pearl River Delta (PRD) region, located in the southern part of Guangdong Province in China, has experienced remarkable economic development and urbanization in the past two decades. The land use changes, especially the rapid urbanization, significantly modify the spatial and temporal variations of biogenic and anthropogenic emissions, which in turn would induce changes in regional climate and air quality. In this paper, a nested transport and chemical model is used to analyze the impacts of biogenic and anthropogenic emissions on PRD photochemical oxidants. The energy-related inventory described by Streets et al. (2003) is modified according to local energy consumptions. The biogenic emissions are driven by the fifth-generation Penn State/NCAR Mesoscale Meteorological model (MM5) prediction, in which a “bottom-up” method is applied to estimate PRD regional BVOC emission capacities for the high-resolution land-cover types used in the Noah land surface model. Surface measurements of O3, CO, NO, NOy, and SO2 concentrations at Hok Tsui (a non-urban site in Hong Kong) and Luhu (an urban site in Guangzhou) are used to evaluate the simulated distributions. The model is then used to assess the relative importance of biogenic and anthropogenic emissions on regional photochemical oxidants through sensitivity studies. Additional simulations are conducted to explore potential impacts of future land-use change on the biogenic emissions and photochemical pollutions in the PRD region.