Impacts of Future NOx and CO Emissions on Regional Chemistry and Climate over Eastern China

A coupled chemical/dynamical model (SOCOL-SOlar Climate Ozone Links) isapplied to study the impacts of future enhanced CO and NOx emissionsover eastern China on regional chemistry and climate. The result shows thatthe increase of CO and NOx emissions has significant effects onregional chemistry, including NOx, CO, O₃, and OH concentrations.During winter, the CO concentration is uniformly increased in the northernhemisphere by about 10 ppbv. During summer, the increase of CO has aregional distribution. The change in O₃, concentrations near easternChina has both strong seasonal and spatial variations. During winter, thesurface O₃, concentrations decrease by about 2 ppbv, while during summerthey increase by about 2 ppbv in eastern China. The changes of CO, NOx,and O₃, induce important impacts on OH concentrations. The changes inchemistry, especially O₃, induce important effects on regional climate.The analysis suggests that during winter, the surface temperature decreasesand air pressure increases in central-eastern China. The changes oftemperature and pressure produce decreases in vertical velocity. We shouldmention that the model resolution is coarse, and the calculatedconcentrations are generally underestimated when they are compared tomeasured results. However, because this model is a coupleddynamical/chemical model, it can provide some useful insights regarding theclimate impacts due to changes in air pollutant emissions.