The Models-3 Community Multi-scale Air Quality modeling system (CMAQ) coupled with the Regional Atmospheric Modeling System (RAMS) is applied to East Asia to study the transport and photochemical transformation of tro...The Models-3 Community Multi-scale Air Quality modeling system (CMAQ) coupled with the Regional Atmospheric Modeling System (RAMS) is applied to East Asia to study the transport and photochemical transformation of tropospheric ozone in March 1998. The calculated mixing ratios of ozone and carbon monoxide are compared with ground level observations at three remote sites in Japan and it is found that the model reproduces the observed features very well. Examination of several high episodes of ozone and carbon monoxide indicates that these elevated levels are found in association with continental outflow, demonstrating the critical role of the rapid transport of carbon monoxide and other ozone precursors from the continental boundary layer. In comparison with available ozonesonde data, it is found that the model-calculated ozone concentrations are generally in good agreement with the measurements, and the stratospheric contribution to surface ozone mixing ratios is quite limited.展开更多
The effect of soil NO emissions on surface ozone in autumn in East China has been studied by using TCTM(Troposphere Chemical Transport Model)with the input of meteorological variables from RAMS.The chemical mechanism ...The effect of soil NO emissions on surface ozone in autumn in East China has been studied by using TCTM(Troposphere Chemical Transport Model)with the input of meteorological variables from RAMS.The chemical mechanism for ozone variation caused by soil emissions has also been investigated.The model results reveal that soil NO emissions are important to regional ozone formation and distribution and the effect of soil NO emissions shows spatial inhomogeneity.Ozone over most areas in northern China decreases with maximum average decrement reaching 5 ppb while it increases over most areas of central and southern China with maximum average increment reaching 7 ppb caused by soil NO emissions.This situation of ozone variation is mainly determined by nonlinear photochemical mechanism.For the low NOx areas(≤3 ppb),ozone increases as NOx increases;for the high NOx areas(>3 ppb),ozone decreases as NOx increases.The effect of soil NO emissions on ozone depends on the transition value and NOx concentrations.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.40245029)the Hundred Talents Program(Global Environmental Change)from the Chinese Academy of Sciences.
文摘The Models-3 Community Multi-scale Air Quality modeling system (CMAQ) coupled with the Regional Atmospheric Modeling System (RAMS) is applied to East Asia to study the transport and photochemical transformation of tropospheric ozone in March 1998. The calculated mixing ratios of ozone and carbon monoxide are compared with ground level observations at three remote sites in Japan and it is found that the model reproduces the observed features very well. Examination of several high episodes of ozone and carbon monoxide indicates that these elevated levels are found in association with continental outflow, demonstrating the critical role of the rapid transport of carbon monoxide and other ozone precursors from the continental boundary layer. In comparison with available ozonesonde data, it is found that the model-calculated ozone concentrations are generally in good agreement with the measurements, and the stratospheric contribution to surface ozone mixing ratios is quite limited.
基金The research is supported by the Knowledge Innovation Project(KZCX2-204)and Hundred Talents Program(Research on Natural Cybernetics)by Chinese Academy of Sciences.
文摘The effect of soil NO emissions on surface ozone in autumn in East China has been studied by using TCTM(Troposphere Chemical Transport Model)with the input of meteorological variables from RAMS.The chemical mechanism for ozone variation caused by soil emissions has also been investigated.The model results reveal that soil NO emissions are important to regional ozone formation and distribution and the effect of soil NO emissions shows spatial inhomogeneity.Ozone over most areas in northern China decreases with maximum average decrement reaching 5 ppb while it increases over most areas of central and southern China with maximum average increment reaching 7 ppb caused by soil NO emissions.This situation of ozone variation is mainly determined by nonlinear photochemical mechanism.For the low NOx areas(≤3 ppb),ozone increases as NOx increases;for the high NOx areas(>3 ppb),ozone decreases as NOx increases.The effect of soil NO emissions on ozone depends on the transition value and NOx concentrations.
