Time trends in the precipitation chemistry at a mountain site in northeastern Spain for the period 1983-1994

Anna Avila

    Research output: Contribution to journalArticleResearchpeer-review

    92 Citations (Scopus)

    Abstract

    In the Montseny mountains (NE Spain), bulk deposition data from 1983 to 1994 revealed a significant decrease of SO42- concentrations and deposition (of 19% for 5 yr means), but non-significant trends for NO3-, NH4+, the base cations or alkalinity concentrations or deposition. The pH distribution of weekly samples shifted to higher values: the median pH increased from 4.74 (H+ concentration, 18.2 μeql-1) in year 1983-84 to 5.50 (H+ concentration, 3.2 μeql-1) in year 1993-94. Base cations and alkalinity concentrations and deposition were strongly depedent on the occurrence of sporadic events of red rains from the Saharan region, which are rich in alkalinity and base cations. Excluding such red rains, SO4- concentration still showed a significant decrease (p = 0.014) over the study period while alkalinity increased (p = 0.08). This is an indication that the reduction of S emissions due to the abatement regulations at an European scale of approximately 37% has had an effect on the bulk deposition over NE Spain, and that, leaving apart the high, but unpredictable, inputs of alkalinity and base cations from the Saharan region, there is an increase in the alkalinity of precipitation.
    Original languageEnglish
    Pages (from-to)1363-1373
    JournalAtmospheric Environment
    Volume30
    Issue number9
    DOIs
    Publication statusPublished - 1 Jan 1996

    Keywords

    • Alkalinity
    • Bulk deposition
    • NE Spain
    • S emissions
    • Sulphate
    • Trends

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