CAJ | 학술논문

为了揭示我国北方地区对流层中下层臭氧(O_3)的形成机理以及周边地区的污染输送对我国北方地区对流层中下层O_3收支的影响,在与外场观测数据比较分析的基础上,利用全球化学输送模式(MOZART-2)采用收支分析方法定量分析了影响我国北方地区对流层中下层O_3的各个物理化学过程.结果表明:我国北方地区对流层下层O_3最重要的来源是光化学生成作用,约占总来源的58.3%(41.5 Tg),光化学生成反应中HO_2对于O_3生成的贡献最大;最大的汇是干沉降过程,约占总汇的43.2%(26.2 Tg);水平净输送作用对我国北方地区对流层中下层O_3收支的影响非常大,在我国北方地区对流层下层,41.6%左右的O_3来自水平净输送,随高度增加,水平输送影响增大,我国北方地区对流层中层大约81.5%的O_3来自水平净输送.
위료게시아국북방지구대류층중하층취양(O_3)적형성궤리이급주변지구적오염수송대아국북방지구대류층중하층O_3수지적영향,재여외장관측수거비교분석적기출상,이용전구화학수송모식(MOZART-2)채용수지분석방법정량분석료영향아국북방지구대류층중하층O_3적각개물이화학과정.결과표명:아국북방지구대류층하층O_3최중요적래원시광화학생성작용,약점총래원적58.3%(41.5 Tg),광화학생성반응중HO_2대우O_3생성적공헌최대;최대적회시간침강과정,약점총회적43.2%(26.2 Tg);수평정수송작용대아국북방지구대류층중하층O_3수지적영향비상대,재아국북방지구대류층하층,41.6%좌우적O_3래자수평정수송,수고도증가,수평수송영향증대,아국북방지구대류층중층대약81.5%적O_3래자수평정수송.
Photochemical reaction,transportation and deposition are the main processes that effect ozone concentrations in troposphere.Quantitative estimation of troposphere ozone budget and the effect of intercontinental transport are very important in order to reveal ozone formation mechanism and the impacts of transport on troposphere ozone over North China.MOZART-2,a global chemical transport model (model of ozone and related tracers,Version 2) is used to assess physical and chemical processes that influence the budget of lower and middle troposphere ozone in North China.Ozone sonde data obtained by TAPTO (The Transport of Air Pollution and Troposphere Ozone over China) field campaign are compared with model results for reference.The comparison shows that MOZART-2 represents the vertical distributions of ozone in the lower and middle troposphere over North China very well,while for the upper troposphere,ozone concentrations are overestimated by the model.Budget analysis indicates that in the lower troposphere over North China,photochemical production (41.5 Tg) contributes about 58.3% of the total ozone sources,and oxidation of NO by HO_2 is the largest contributor especially.The largest consumption process in lower troposphere is dry deposition,accounting for about 43.2% of the total ozone sinks.Ozone chemical budget varies with seasons notably.It reaches its maximum in summer due to strong photochemical reactions,while the minimum chemical budget occurs in winter because of low temperature and weak reactions.The chemical production of ozone is more than the chemical loss in the lower troposphere in the whole year.But for middle troposphere,chemical loss exceeds chemical production all year except in summer.In summer,ozone precursors in the boundary layer can be transported to upper level of troposphere due to the active convection,and the photochemical reactions of more ozone precursors lead to more ozone production.Net horizontal transport plays an important role in ozone budget in the low and middle troposphere over North China.About 41.6% ozone in lower troposphere comes from net horizontal transport.As the height increases,wind speed rises,and the influence of net horizontal transport enhances.Nearly 81.5% ozone in the middle troposphere comes from net horizontal transport.Constrained by simulating ability for sub-grid processes,the model tends to overestimate ozone concentration in upper troposphere and near the tropopause over middle to high northern latitudes.Modeling for sub-grid processes such as stratosphere-troposphere exchange (STE) should be improved to comprehend mechanism of ozone in the whole troposphere in depth.