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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Precipitation chemistry at a rural Mediterranean site: Between anthropogenic pollution and natural emissions - art. no. 4278
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Precipitation chemistry at a rural Mediterranean site: Between anthropogenic pollution and natural emissions - art. no. 4278

机译：地中海乡村地区的降水化学：在人为污染和自然排放之间-艺术。没有。 4278

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1] The chemistry of weekly rainwater collected at a rural site ( La Castanya, Montseny Mountains, northeast Spain), exposed both to anthropogenic pollutants and natural African dust, was analyzed for the period 1983 - 2000. On the basis of back trajectories and synoptic charts we distinguished four source regions: ( 1) African, ( 2) European, ( 3) Oceanic, and ( 4) Local. The chemical characteristics of each provenance were interpreted in relation to the emission processes at each source region. The temporal trends between 1983 and 2000 in the volume weighted mean (VWM) concentrations showed an upward trend for alkalinity in European, Local, and Oceanic provenances, while they showed a slight ( nonsignificant) downward trend for African rains. All provenances exhibited a significant decline in excSO(4)(-2), which was most pronounced for European rains (b = -5.7 mueqL(-1) yr(-1)). Because NO3- remained about constant (except for European rains), NO3- acquired a more important role in the acid anion contribution. A reduction of the acid deposition for European, Local, and Oceanic rains was observed, as well as an increase in the global deposition of alkalinity. The role of African rains appeared as a determinant in the accumulated alkalinity during the period. A quantification of the transport of pollutant species (SO4-2, NO3-, and NH4+) from eight contributing European subregions was obtained on the basis of the residence time of the trajectories in each subregion. It suggested that not only subregions closer to the receptor point, such as the Iberian Peninsula, France, and the United Kingdom, were important contributors to the deposition of SO4-2, NO3-, and NH4+ but also distant sites such as Scandinavia contributed considerably. [References: 44
机译：1]分析了1983年至2000年期间在农村地区（西班牙东北部的拉卡斯塔尼亚，蒙塞尼山脉，西班牙东北部）暴露的每周雨水的化学性质，这些雨水都暴露于人为污染物和非洲天然粉尘。在图表中，我们区分了四个来源区域：（1）非洲，（2）欧洲，（3）海洋和（4）本地。根据每个源区域的排放过程解释了每种出处的化学特征。 1983年至2000年之间的体积加权平均值（VWM）浓度的时间趋势显示，欧洲，本地和海洋种源的碱度呈上升趋势，而非洲降雨则呈轻微（无明显）下降趋势。所有种源都显示出excSO（4）（-2）的显着下降，这在欧洲降雨中最为明显（b = -5.7 mueqL（-1）yr（-1））。因为NO3-保持恒定（欧洲降雨除外），所以NO3-在酸阴离子的贡献中起着更重要的作用。观察到欧洲，局部和海洋性降雨的酸沉积减少，以及全球碱度沉积增加。在此期间，非洲降雨的作用似乎是累积碱度的决定因素。根据轨迹在每个次区域中的停留时间，对来自八个贡献欧洲次区域的污染物物种（SO4-2，NO3-和NH4 +）的运输进行了量化。这表明不仅更接近受体点的子区域（例如伊比利亚半岛，法国和英国）是SO4-2，NO3-和NH4 +沉积的重要贡献者，而遥远的地点（如斯堪的纳维亚半岛）也做出了重要贡献。 [参考：44

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