Composition, distribution and neutralization of 'acid rain' derived from Masaya volcano, Nicaragua.

N. Johnson, R. A. Parnell

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Acid rain (pH 2.5-5.0) from the volcanic plume of Masaya Caldera, Nicaragua, is composed of HCl and H2SO4 in systematically varying proportions. The dominance of HCl in volcanic acid rain makes it distinctly different from anthropogenic acid rain. The pH of volcanic acid rain is largely controlled by its HCl concentration. Volcanic acids are locally damaging, killing vegetation with the conspicuous exception of the shrubs Malanthora and Lantana. These shrubs have the ability to rapidly and completely neutralize acid rain by releasing K+ at their leaf surfaces. The mechanism by which these plants sustain their acid neutralizing capacity is evidently by pumping acidity into the soil in exchange for K+ from soil exchange surfaces. In effect the Malanthora shrub layer is acting as a short-term acid sink for incident acid rain. However, the final acid sink in this system is the base exchange reservoir of the local soils. -Authors

Original languageEnglish (US)
Pages (from-to)106-117
Number of pages12
JournalTellus, Series B
Volume38 B
Issue number2
StatePublished - Jan 1 1986
Externally publishedYes

ASJC Scopus subject areas

  • Atmospheric Science

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