The Role of In Situ Photochemistry in the Control of Ozone during Spring at the Jungfraujoch (3,580 m asl) – Comparison of Model Results with Measurements     

P. Zanis  P. S. Monks  E. Schuepbach  S. A. Penkett 《Journal of Atmospheric Chemistry》2000,37(1):1-27

A photochemical box model has been used to model themeasured diurnal ozone cycle in spring at Jungfraujochin the Swiss Alps. The comparison of the modelleddiurnal ozone cycle with the mean measured diurnalozone cycle in spring, over the period 1988–1996,shows a good agreement both with regard to the shapeand amplitude. Ozone concentrations increase duringthe daytime and reach a maximum at about 16:00–17:00(GMT) in both the modelled and the mean observed ozonecycle, indicative of net ozone production during thedaytime at Jungfraujoch in spring. The agreement isbetter when the modelled ozone cycle is compared withthe mean measured diurnal cycle (1988–1996) filteredfor north-westerly winds >5 m/s (representative ofregional background conditions at Jungfraujoch). Inaddition to ozone, the modelled diurnal cycle of[HO₂] + [CH₃O₂] also shows rather goodagreement with the mean diurnal cycle of the peroxyradicals measured during FREETEX '96, a FREETropopsheric Experiment at Jungfraujoch in April/May1996. Furthermore, this mean diurnal cycle of the sumof the peroxy radicals measured during FREETEX '96 isused to calculate, using steady-state expressions, therespective diurnal cycle of the OH radical. Thecomparison of the OH diurnal cycle, calculated fromthe peroxy radical measurements during FREETEX '96,with the modelled one, reveals also good agreement.The net ozone production rate during the day-time is0.27 ppbv h^-1 from the model, and 0.13 ppbvh^-1 from the observations during FREETEX '96. Theobservations and model results both suggest that thediurnal ozone variation in spring at Jungfraujoch isprimarily of photochemical origin. Furthermore, theobserved and modelled positive net ozone productionrates imply that tropospheric in situphotochemistry contributes significantly to theobserved high spring ozone values in the observedbroad spring-summer ozone maximum at Jungfraujoch.  相似文献   

A NUMERICAL STUDY OF THE VARIATIONS AND DISTRIBUTIONS OF TROPOSPHERIC OZONE AND ITS PRECURSORS OVER CHINA     

王喜红  李兴生 《Acta Meteorologica Sinica》1999,(1)

By means of a three-dimensional meteorological model(MM5)and a chemical model,thedistributions of tropospheric ozone and its precursors over China have been simulated in summerand winter time,16—18 August 1994 and 7—9 January 1995.The distribution of ozone over theTibetan Plateau in summer time is deeply discussed.The simulated results indicate that thedistributions of surface ozone and NO_x are in good agreement with observed results,and humanactivities and photochemical reactions are the main factors controlling the surface ozone and NO_xconcentrations.In addition,higher ozone concentrations are coincided with the air convergence,and the lower concentrations are related to the air divergence.In summer,over the TibetanPlateau the strong flow convergence results in higher ozone concentrations in the lowertroposphere:and the strong flow divergence results in lower ozone concentrations in the uppertroposphere.In winter time ozone concentrations show Iarge-scale characteristics controlled bywesterly flow,and in the jet area they are lower than those outside the jet.  相似文献   

对流层NO₂柱浓度卫星遥感反演综述   总被引：1，自引：0，他引：1       下载免费PDF全文

陈良富  韩冬  陶金花  苏林 《遥感学报》2009,13(3):354-362

NO2是主要的大气痕量气体, 对流层NO2垂直柱密度分布图已经用于诸如污染排放和污染物分布的科学应用研究。就NO2柱浓度的卫星差分光谱吸收反演算法(DOAS)进行了评述, 包括误差分析、验证和发展趋势。对DOAS算法中的主要技术环节进行了详细的阐述, 如ring效应算法、平流层NO2浓度算法和大气质量因子(AMF)问题。论文描述了影响卫星反演NO2浓度, 如云、NO2廓线的先验数据和气溶胶等不确定性因素。针对NO2反演应用需求提出了今后应该加强的内容, 如进一步加强NO2算法研究、发展空气质量探测的静止卫星、重视基于地基多轴被动DOAS和机载平台成像DAOS观测对卫星反演结果的验证。  相似文献