Impacts of decadal variations in natural emissions due to land-cover changes on ozone production in southern China

摘要: The decadal variations in emissions of high-reactivity biogenic volatile organics (BVOCs), as a result land-cover changes, could significantly impact ozone (O 3 ) production. In this study, the Weather Research and Forecasting/Chemistry (WRF/Chem) modelling system, coupled with dynamic vegetation data sets derived from Moderate Resolution Imaging Spectroradiometer (MODIS, 2001–2012) Advanced Very High Radiometer (AVHRR, early 1990s) measurements, were used to investigate impacts changes on natural emissions, consequently O production, Pearl River Delta (PRD) region southern China over past two decades. Model results indicate that BVOC highly dependent forest area. total domain increased by factor due afforestation since 1990s, declined slowly (−5.8% yr −1 until 2006 then continuously (+9.1% 2012. have complex implications for summer production PRD, depending chemical regimes prevailing winds. most sensitive downwind areas, it was found large increase during 2006–2012 tended reduce surface concentrations 1.6–2.5 ppb rural regions, but caused an increment peaks up 2.0–6.0 VOC-limited urban areas (e.g., Guangzhou, Foshan Zhongshan). opposite true period 2001–2006, when reduced resulted 1.3–4.0 increases daytime northern regions. Impact two-fold 1990s 0.9–4.6 areas. This study suggests potential chemistry should be considered long-term land-use planning air-quality management. Keywords: variations, ozone, PRD (Published: 28 September 2015) Citation: Tellus B 2015, 67, 27676, http://dx.doi.org/10.3402/tellusb.v67.27676