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Trends in Catskill Stream Water Quality: Evidence From Historical Data

Trends in Catskill Stream Water Quality: Evidence From Historical Data Historical data for large streams in the Catskill Mountains indicate that acidic deposition has significantly influenced water quality, but that this effect is most observable in early (pre‐1945) data, and consists primarily of increased base cation (CaMg) concentrations. More recent data suggest that landscape disturbance currently exerts a stronger influence on acid/base status of large streams than does acidic deposition, resulting in increases in both CaMg and acid‐neutralizing capacity (ANC). Estimates of SO42− concentration indicate that SO42− is a conservative ion in the Catskills, and stream water concentrations have decreased since reaching maximum values around 1970, consistent with temporal trends in emissions and deposition in the northeastern United States. Nitrate concentrations, on the other hand, have increased substantially in all but one stream in the past two decades, independent of any change in nitrogen deposition in the region; changes in the capacity of watersheds to retain nitrogen are hypothesized as causes of increased stream water NO3−. In small, undisturbed streams, increases in NO3− and decreases in CaMg appear to offset the effects of reduced SO42−, and lead to decreasing trends in ANC. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

Trends in Catskill Stream Water Quality: Evidence From Historical Data

Stoddard, John L.
Water Resources Research , Volume 27 (11) – Nov 1, 1991
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References (45)

Publisher
Wiley
Copyright
Copyright © 1991 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
DOI
10.1029/91WR02009
Publisher site
See Article on Publisher Site

Abstract

Historical data for large streams in the Catskill Mountains indicate that acidic deposition has significantly influenced water quality, but that this effect is most observable in early (pre‐1945) data, and consists primarily of increased base cation (CaMg) concentrations. More recent data suggest that landscape disturbance currently exerts a stronger influence on acid/base status of large streams than does acidic deposition, resulting in increases in both CaMg and acid‐neutralizing capacity (ANC). Estimates of SO42− concentration indicate that SO42− is a conservative ion in the Catskills, and stream water concentrations have decreased since reaching maximum values around 1970, consistent with temporal trends in emissions and deposition in the northeastern United States. Nitrate concentrations, on the other hand, have increased substantially in all but one stream in the past two decades, independent of any change in nitrogen deposition in the region; changes in the capacity of watersheds to retain nitrogen are hypothesized as causes of increased stream water NO3−. In small, undisturbed streams, increases in NO3− and decreases in CaMg appear to offset the effects of reduced SO42−, and lead to decreasing trends in ANC.

Journal

Water Resources Research – Wiley

Published: Nov 1, 1991

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