Numerical Study on the Impacts of Heterogeneous Reactions on Ozone Formation in the Beijing Urban Area   总被引：2，自引：0，他引：2  

徐峻  张远航  王玮 《大气科学进展》2006,23(4):605-614

The air quality model CMAQ-MADRID （Community Multiscale Air Quality-Model of Aerosol Dynamics, Reaction, Ionization and Dissolution） was employed to simulate summer O3 formation in Beijing China, in order to explore the impacts of four heterogeneous reactions on O3 formation in an urban area. The results showed that the impacts were obvious and exhibited the characteristics of a typical response of a VOC-limited regime in the urban area. For the four heterogeneous reactions considered, the NO2 and HO2 heterogeneous reactions have the most severe impacts on O3 formation. During the O3 formation period, the NO2 heterogeneous reaction increased new radical creation by 30%, raising the atmospheric activity as more NO→NO2 conversion occurred, thus causing the O3 to rise. The increase of O3 peak concentration reached a maximum value of 67 ppb in the urban area. In the morning hours, high NO titration reduced the effect of the photolysis of HONO, which was produced heterogeneously at night in the surface layer. The NO2 heterogeneous reaction in the daytime is likely one of the major reasons causing the O3 increase in the Beijing urban area. The HO2 heterogeneous reaction accelerated radical termination, resulting in a decrease of the radical concentration by 44% at the most. O3 peak concentration decreased by a maximum amount of 24 ppb in the urban area. The simulation results were improved when the heterogeneous reactions were included, with the O3 and HONO model results close to the observations.  相似文献   

安徽仙霞地区地质地球化学特征及找矿方向     

程乃福  黄博  徐峻 《安徽地质》2011,21(1):48-51

在1:5万水系沉积物测量的基础上,对仙霞地区的地球化学特征进行了初步分析。对元素的富集和离散特征、元素组合特征、组合异常分布特征进行了研究。研究发现W、Au、Ag、Mo、Pb、Zn为区内具一定潜力的找矿指标。根据区内成矿地质特征,水系沉积物地球化学异常,圈定了找矿远景区4处,提出了找矿方向。  相似文献   

NUMERICAL EXPERIMENT ON THE SEASONAL VARIATION OF GLOBAL OCEAN AND THE EL NINO PROCESS——PART Ⅱ:NUMERICAL EXPERIMENT ON THE 1972—1973 EL NINO PROCESS          下载免费PDF全文

徐峻  陈隆勋 《Acta Meteorologica Sinica》1994,(3)

In Part Ⅰ,the climatological state of the ocean has been simulated by integrating a 6-layer,4°×5°grid global oceanmodel up to 100 years.In this part,the forcing in 1971—1973 is calculated by COADS,and using the integrated result ofthe 100th year as the initial state,we simulated the El Nino process in 1972—1973.The results are as follows:(1)We have reproduced the 1972—1973 El Nino process and its cooling process in the equatorial eastern Pacific.The simulated distribution of SST and the intensity of El Nino are similar to the observations.(2)The results show that there are two kinds of processes in El Nino formation:(i)the warming occurs in the equa-torial western Pacific,then propagates eastward to the central Pacific;(ii)the warm water forms near the coast of theSouth America and then,propagates westward along the equator.Observation indicates that the two processes were in-cluded in the El Nino in 1972.Our numerical experiment can simulate out both of them,although the first process isstronger than the second.In observation,the intensities of both processes are similar.(3)The El Nino process in 1972 can be simulated by running the model with the wind stress forcing,but its intensityis 1/2 the magnitude of observation.Only after adding the forcing of heat flux to run the model,its intensity can coin-cide with the observation.So the forcing effect of heat flux should not be ignored in the formation of El Nino,especiallyin the study of El Nino intensity.  相似文献