Long-term response in episodic acidification to declining SO42– deposition in two streams in Nova Scotia
Other literature type
Clair, T. A.
Hemond, H. F.
(issn: 1607-7938, eissn: 1607-7938)
anthropogenically driven episodic acidification associated with extended winter
snow melt/rain episodes between 1983 and 1998 were investigated for two streams
in Nova Scotia, Canada. The anthropogenic contribution to Acid Neutralization
Capacity (ANC) was analysed using the Boreal Dilution Model (Bishop <i>et al.</i>, 2000)
modified by applying a sea-salt correction to all input
hydrochemistry. The anthropogenic contribution to episodic ANC decline was
statistically significant and strongly correlated with the decline in acid
deposition, which decreased by approximately 50% during the period of record.
Sensitivity analysis demonstrated that the BDM can be applied to surface waters
with sea-salt contributions although the correction increases model uncertainty.
Results of this study demonstrate the effectiveness of reduced emissions in
North America in the last decades in decreasing the severity of episodic
acidification in the Atlantic region of Canada.</p>
<p style="line-height: 20px;"><b>Keywords:</b> episodic acidification, acidification recovery, Nova Scotia, snowmelt, winter</p>