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Recent patterns of sulfate variability in pristine streams

Atmospheric Environment - Part A General Topics

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Abstract

Systematic modes of spatial and temporal variation in a 13-y record of stream sulfate from a nationwide network of headwater sampling stations are defined using principal components. Based on the undisturbed nature of the sampling network, it is suggested that these modes of stream sulfate variability are analogues for variations in acid deposition. Three statistically significant components, accounting for approximately 50% of the total stream sulfate variance, are identified. Analysis of component loadings and scores indicates that a major transition occurred in the early 1970s when stream sulfate concentrations in the northeast changed from persistently above mean levels to persistently below. At the same time concentrations of sulfate in Gulf and Southeast Atlantic coast streams shifted from persistently below to persistently above mean concentrations. Significantly, these changes occurred contemporaneously with regional trends in sulfate emissions which can generally be characterized as decreasing in the northeast and increasing in the southeast.Systematic modes of spatial and temporal variation in a 13-y record of stream sulfate from a nationwide network of headwater sampling stations are defined using principal components. Based on the undisturbed nature of the sampling network, it is suggested that these modes of stream sulfate variability are analogues for variations in acid deposition. Three statistically significant components, accounting for approximately 50% of the total stream sulfate variance, are identified. Analysis of component loadings and scores indicates that a major transition occurred in the early 1970s when stream sulfate concentrations in the northeast changed from persistently above mean levels to persistently below. At the same time concentrations of sulfate in Gulf and Southeast Atlantic coast streams shifted from persistently below to persistently above mean concentrations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Recent patterns of sulfate variability in pristine streams
Series title:
Atmospheric Environment - Part A General Topics
Volume
20
Issue:
2
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Atmospheric Environment - Part A General Topics
First page:
367
Last page:
375
Number of Pages:
9