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中文摘要：
利用2007年12月18日至21日南京市4次雾过程的雾水样本资料,结合同期自动气象站资料,分析了雾水的pH值和化学成分在雾发展过程中随环境气象要素的演变特征.结果发现,气象因子影响污染物的来源,造成酸碱成分比重的变化,进而影响雾水的pH和pA i值;4次雾过程雾水的平均pH值为5.63,其中pH〈5.6（酸雨标准）的样本数占总数的57.1%,均处于第三次雾过程;通过离子间相关关系分析表明,4次雾过程采集到的雾水样本中大量Mg2＋、C l-主要来源于局地污染物.结合后向轨迹模式分析进一步说明辐射雾的发生主要受局地大陆气团影响,受南面长江水汽影响,将发展为平流雾;而受东北风带来的海洋气团及附近工业区污染物控制影响下的平流雾,离子浓度会大幅度增加.
英文摘要：
The evolution of pH and chemical compositions of the fog water with environmental meteorological factors have been investigated using the fog sample data of four fog processes of Nanjing and Automatic Weather Station（AWS） data during 18—21December,2007.The results show that the environmental factors exerted an important influence on the sources of pollutants which changed the proportion of acid-base composition,thereby affected the pH and pAi values of the fog water.In the four fog processes discussed here,the average pH value of the fog water was 5.63 with 57.1% of the samples having pH values lower than 5.6（acid rain standard reference） and all of these samples were obtained from the third fog process.An analysis of the correlation between ions indicates that large fraction of Mg2＋ and Cl-in the fog water originated mainly from local pollutants.Combined with backward trajectory model analysis,it was further manifested that the occurrence of radiation fog was mainly influenced by local continental air mass,and the fog would be developed into advection fog if it is affected by the water vapor of Yangtze River from the south,and that the ion concentration would be greatly raised under the influence of marine air mass from northeast and pollutants from the nearby industrial areas.
同期刊论文项目
同项目期刊论文
Microphysical Structure and Evolution of a Four-Day Persistent Fog Event in Nanjing in December 2006
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