Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992
Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Clair, Thomas A. [verfasserIn] |
|---|
| Format: |
Artikel |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
1995 |
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| Schlagwörter: |
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| Anmerkung: |
© Kluwer Academic Publishers 1995 |
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| Übergeordnetes Werk: |
Enthalten in: Environmental monitoring and assessment - Kluwer Academic Publishers, 1981, 35(1995), 2 vom: Apr., Seite 165-179 |
|---|---|
| Übergeordnetes Werk: |
volume:35 ; year:1995 ; number:2 ; month:04 ; pages:165-179 |
| Links: |
|---|
| DOI / URN: |
10.1007/BF00633713 |
|---|
| Katalog-ID: |
OLC2073701531 |
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| 520 | |a Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. | ||
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10.1007/BF00633713 doi (DE-627)OLC2073701531 (DE-He213)BF00633713-p DE-627 ger DE-627 rakwb eng 333.7 VZ Clair, Thomas A. verfasserin aut Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1995 Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. Time Window Total Organic Carbon Water Chemistry Nitrate Concentration Significant Trend Ehrman, James M. aut Enthalten in Environmental monitoring and assessment Kluwer Academic Publishers, 1981 35(1995), 2 vom: Apr., Seite 165-179 (DE-627)130549649 (DE-600)782621-7 (DE-576)476125413 0167-6369 nnns volume:35 year:1995 number:2 month:04 pages:165-179 https://doi.org/10.1007/BF00633713 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-FOR SSG-OLC-IBL SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_11 GBV_ILN_22 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4193 GBV_ILN_4219 AR 35 1995 2 04 165-179 |
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10.1007/BF00633713 doi (DE-627)OLC2073701531 (DE-He213)BF00633713-p DE-627 ger DE-627 rakwb eng 333.7 VZ Clair, Thomas A. verfasserin aut Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1995 Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. Time Window Total Organic Carbon Water Chemistry Nitrate Concentration Significant Trend Ehrman, James M. aut Enthalten in Environmental monitoring and assessment Kluwer Academic Publishers, 1981 35(1995), 2 vom: Apr., Seite 165-179 (DE-627)130549649 (DE-600)782621-7 (DE-576)476125413 0167-6369 nnns volume:35 year:1995 number:2 month:04 pages:165-179 https://doi.org/10.1007/BF00633713 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-FOR SSG-OLC-IBL SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_11 GBV_ILN_22 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4193 GBV_ILN_4219 AR 35 1995 2 04 165-179 |
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10.1007/BF00633713 doi (DE-627)OLC2073701531 (DE-He213)BF00633713-p DE-627 ger DE-627 rakwb eng 333.7 VZ Clair, Thomas A. verfasserin aut Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1995 Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. Time Window Total Organic Carbon Water Chemistry Nitrate Concentration Significant Trend Ehrman, James M. aut Enthalten in Environmental monitoring and assessment Kluwer Academic Publishers, 1981 35(1995), 2 vom: Apr., Seite 165-179 (DE-627)130549649 (DE-600)782621-7 (DE-576)476125413 0167-6369 nnns volume:35 year:1995 number:2 month:04 pages:165-179 https://doi.org/10.1007/BF00633713 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-FOR SSG-OLC-IBL SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_11 GBV_ILN_22 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4193 GBV_ILN_4219 AR 35 1995 2 04 165-179 |
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10.1007/BF00633713 doi (DE-627)OLC2073701531 (DE-He213)BF00633713-p DE-627 ger DE-627 rakwb eng 333.7 VZ Clair, Thomas A. verfasserin aut Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1995 Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. Time Window Total Organic Carbon Water Chemistry Nitrate Concentration Significant Trend Ehrman, James M. aut Enthalten in Environmental monitoring and assessment Kluwer Academic Publishers, 1981 35(1995), 2 vom: Apr., Seite 165-179 (DE-627)130549649 (DE-600)782621-7 (DE-576)476125413 0167-6369 nnns volume:35 year:1995 number:2 month:04 pages:165-179 https://doi.org/10.1007/BF00633713 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-FOR SSG-OLC-IBL SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_11 GBV_ILN_22 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4193 GBV_ILN_4219 AR 35 1995 2 04 165-179 |
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10.1007/BF00633713 doi (DE-627)OLC2073701531 (DE-He213)BF00633713-p DE-627 ger DE-627 rakwb eng 333.7 VZ Clair, Thomas A. verfasserin aut Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1995 Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. Time Window Total Organic Carbon Water Chemistry Nitrate Concentration Significant Trend Ehrman, James M. aut Enthalten in Environmental monitoring and assessment Kluwer Academic Publishers, 1981 35(1995), 2 vom: Apr., Seite 165-179 (DE-627)130549649 (DE-600)782621-7 (DE-576)476125413 0167-6369 nnns volume:35 year:1995 number:2 month:04 pages:165-179 https://doi.org/10.1007/BF00633713 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-FOR SSG-OLC-IBL SSG-OLC-PHA SSG-OLC-DE-84 GBV_ILN_11 GBV_ILN_22 GBV_ILN_70 GBV_ILN_4012 GBV_ILN_4193 GBV_ILN_4219 AR 35 1995 2 04 165-179 |
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Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 |
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Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 |
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Clair, Thomas A. |
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Environmental monitoring and assessment |
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Environmental monitoring and assessment |
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1995 |
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Clair, Thomas A. Ehrman, James M. |
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10.1007/BF00633713 |
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acid precipitation-related chemical trends in 18 rivers of atlantic canada — 1983 to 1992 |
| title_auth |
Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 |
| abstract |
Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. © Kluwer Academic Publishers 1995 |
| abstractGer |
Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. © Kluwer Academic Publishers 1995 |
| abstract_unstemmed |
Abstract Using non-parametric techniques, we studied water chemistry changes from 1983 to 1992 in 18 rivers located at the extreme northeastern portion of North America. This period was marked by a decrease in sulfate (SO4−) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO3−) production and deposition generally increased over this whole period. We used two time windows, 1983 to 1989 and 1983 to 1992, to determine if changes in river acidification variables occurred over the ten year period. We found significant trends of increasing pH and acid neutralization capacity (ANC) concentrations at eight sites using both time windows, while SO4−2 increased at five and seven sites during the same two time periods. Nitrate concentrations showed few consistent trends, while base cations showed increases in the earlier part of the data set and total organic carbon (TOC) showed long-term decreases. There were few significant trends in hydrogen ($ H^{+} $), and a slight decrease in SO4−2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO4−2 concentration and export trends to be due to evapotranspiration in the basins, causing a concentration of ions in water. Nitrate and calcium exports showed no trends, while TOC decreased at four or five sites, depending on the time window used. Longer data sets tended to produce more detectable trends. Overall, water chemistry in the region is showing the effects of reduced SO4− loads and is not yet being affected by the increases in NO3− deposition. © Kluwer Academic Publishers 1995 |
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Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 |
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