Document Type

Article

Publication Title

Water Resources Research

Publication Date

4-1-1992

First Page

1081

Last Page

1088

Issue Number

4

Volume Number

28

Abstract/ Summary

Major episodic acidifications were observed on several occasions in first-order brooks at Acadia National Park, Mount Desert Island, Maine. Short-term declines of up to 2 pH units and 130-mu-eq L-1 acid-neutralizing capacity were caused by HCl from soil solutions, rather than by H2SO4 or HNO3 from precipitation, because (1) SO4 concentrations were constant or decreased during the pH depression, (2) Cl concentrations were greatest at the time of lowest pH, and (3) Na:Cl ratios decreased from values much greater than those in precipitation (a result of chemical weathering), to values equal to or less than those in precipitation. Dilution, increases in NO3 concentrations, or increased export or organic acidity from soils were insufficient to cause the observed decreases in pH. These data represent surface water acidifications due primarily to an ion exchange "salt effect" of Na+ for H+ in soil solution, and secondarily to dilution, neither of which is a consequence of acidic deposition. The requisite conditions for a major episodic salt effect acidification include acidic soils, and either an especially salt-laden wet precipitation event, or a period of accumulation of marine salts from dry deposition, followed by wet inputs.

Citation/Publisher Attribution

Heath, RH, Kahl, JS, Norton, SA, and Fernandez, IJ, 1992, Episodic Stream Acidification Caused By Atmospheric Deposition of Sea Salts at Acadia National-Park, Maine, United-States: Water Resources Research, v. 28, p. 1081-1088. To view the published open abstract, go to http://dx.doi.org and enter the DOI.

Publisher Statement

© Copyright 1992 American Geophysical Union

DOI

10.1029/91WR03031

Version

publisher's version of the published document

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