Presentation of the influence of deposition uncertainties on acidity critical load exceedance across Wales

2006 ◽  
Vol 9 (1) ◽  
pp. 32-45 ◽  
Author(s):  
Elizabeth Heywood ◽  
J. Duncan Whyatt ◽  
Jane Hall ◽  
Richard Wadsworth ◽  
Trevor Page
Keyword(s):  
Critical Load ◽  
Critical Load Exceedance

Assessing relationships between red spruce radial growth and pollution critical load exceedance values

2016 ◽  
Vol 359 ◽  
pp. 83-91 ◽  
Author(s):  
Benjamin J. Engel ◽  
Paul G. Schaberg ◽  
Gary J. Hawley ◽  
Shelly A. Rayback ◽  
Jennifer Pontius ◽  
...  
Keyword(s):  
Critical Load ◽  
Radial Growth ◽  
Red Spruce ◽  
Critical Load Exceedance

Are Indicators for Critical Load Exceedance Related to Forest Condition?

2007 ◽  
Vol 183 (1-4) ◽  
pp. 293-308 ◽  
Author(s):  
Karin Hansen ◽  
Lars Vesterdal ◽  
Annemarie Bastrup-Birk ◽  
Jørgen Bille-Hansen
Keyword(s):  
Critical Load ◽  
Forest Condition ◽  
Critical Load Exceedance

Recovery from acidification in Nova Scotia: temporal trends and critical loads for 20 headwater lakes

2006 ◽  
Vol 63 (7) ◽  
pp. 1504-1514 ◽  
Author(s):  
C J Whitfield ◽  
J Aherne ◽  
S A Watmough ◽  
P J Dillon ◽  
T A Clair
Keyword(s):  
Steady State ◽  
Nova Scotia ◽  
Critical Load ◽  
Temporal Trends ◽  
Acid Neutralizing Capacity ◽  
Headwater Lakes ◽  
Fab Model ◽  
Neutralizing Capacity ◽  
S Deposition ◽  
Critical Load Exceedance

The chemical response of 20 headwater lakes in Nova Scotia to reduced acid deposition was investigated using trend analysis, and the need for further reductions was assessed using two steady-state, critical load models. Significant decreases were observed in the concentration of nonmarine sulphate (SO42–) and hydrogen (H+) at four wet deposition monitoring stations across Atlantic Canada since 1984. Dominant trends in surface water were decreasing SO42– concentrations, with little improvement in alkalinity and H+. Based on the Steady State Water Chemistry (SSWC) and First-order Acidity Balance (FAB) models, and using a critical chemical limit for acid-neutralizing capacity of 20 µmolc·L–1, critical load is exceeded at 9 and 13 of the 20 study lakes, respectively. Application of the SSWC model suggests that sulphur (S) deposition must be reduced by 37.3 mmolc·m–2·year–1 from 1997 levels to prevent critical load exceedance at 95% of the study lakes. Using the FAB model, the minimum reductions in nitrogen and S deposition necessary to protect 95% of the study lakes are 32.7 and 42.1 mmolc·m–2·year–1, respectively. Additional reductions beyond those proposed for 2030 are required to minimize critical load exceedance and promote recovery in alkalinity and pH of surface waters at the study catchments.

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