Assessing decadal changes in rainwater alkalinity at a rural Mediterranean site in the Montseny Mountains (NE Spain)

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• 作者：Avila ; A. ; Rodà ; F.
• 关键词：Rainwater chemistry ; Alkalinity ; Saharan dust ; Sulphate ; Nitrate ; Mediterranean ; Time-trends ; NAO
• 刊名：Atmospheric Environment
• 出版年：2002
• 出版时间：June, 2002
• 年：2002
• 卷：36
• 期：17
• 页码：2881-2890
• 全文大小：812 K

文摘

Annual volume-weighted mean (VWM) concentrations in rainwater collected at La Castanya (LC, Montseny Mountains, NE Spain) were analysed from 1983 to 2000 to study the temporal trends in precipitation chemistry, and the causes behind the changes. A significant positive correlation was found between annual rainwater SO₄p>2−p> concentrations at LC and Spanish SO₂ emissions (r=0.73, P=0.0008) both decreasing remarkably during this period. Rainwater alkalinity increased during the period, shifting from negative values at the beginning (VWM in the 5 initial years=−2.7μeqlp>−1p>) to alkaline values in recent years (VWM in the 5 final years=18.0μeqlp>−1p>). Stepwise regression analysis indicated that 88 % of the variation of alkalinity could be accounted for by the variability of non-marine Cap>2+p> and non-marine SO₄p>2−p>, with a more prominent dependence on Cap>2+p>.