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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling...
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E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1995 |
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15 |
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Springer Online Journal Archives 1860-2002 |
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in: Environmental monitoring and assessment - 1981, 35(1995) vom: Feb., Seite 165-179 |
| Übergeordnetes Werk: |
volume:35 ; year:1995 ; month:02 ; pages:165-179 ; extent:15 |
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NLEJ193782766 |
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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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. | ||
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(DE-627)NLEJ193782766 DE-627 ger DE-627 rakwb eng Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. Springer Online Journal Archives 1860-2002 Clair, Thomas A. oth Ehrman, James M. oth in Environmental monitoring and assessment 1981 35(1995) vom: Feb., Seite 165-179 (DE-627)NLEJ188987800 (DE-600)2012242-1 1573-2959 nnns volume:35 year:1995 month:02 pages:165-179 extent:15 http://dx.doi.org/10.1007/BF00633713 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 35 1995 2 165-179 15 |
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(DE-627)NLEJ193782766 DE-627 ger DE-627 rakwb eng Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. Springer Online Journal Archives 1860-2002 Clair, Thomas A. oth Ehrman, James M. oth in Environmental monitoring and assessment 1981 35(1995) vom: Feb., Seite 165-179 (DE-627)NLEJ188987800 (DE-600)2012242-1 1573-2959 nnns volume:35 year:1995 month:02 pages:165-179 extent:15 http://dx.doi.org/10.1007/BF00633713 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 35 1995 2 165-179 15 |
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(DE-627)NLEJ193782766 DE-627 ger DE-627 rakwb eng Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. Springer Online Journal Archives 1860-2002 Clair, Thomas A. oth Ehrman, James M. oth in Environmental monitoring and assessment 1981 35(1995) vom: Feb., Seite 165-179 (DE-627)NLEJ188987800 (DE-600)2012242-1 1573-2959 nnns volume:35 year:1995 month:02 pages:165-179 extent:15 http://dx.doi.org/10.1007/BF00633713 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 35 1995 2 165-179 15 |
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(DE-627)NLEJ193782766 DE-627 ger DE-627 rakwb eng Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. Springer Online Journal Archives 1860-2002 Clair, Thomas A. oth Ehrman, James M. oth in Environmental monitoring and assessment 1981 35(1995) vom: Feb., Seite 165-179 (DE-627)NLEJ188987800 (DE-600)2012242-1 1573-2959 nnns volume:35 year:1995 month:02 pages:165-179 extent:15 http://dx.doi.org/10.1007/BF00633713 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 35 1995 2 165-179 15 |
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(DE-627)NLEJ193782766 DE-627 ger DE-627 rakwb eng Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992 1995 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. Springer Online Journal Archives 1860-2002 Clair, Thomas A. oth Ehrman, James M. oth in Environmental monitoring and assessment 1981 35(1995) vom: Feb., Seite 165-179 (DE-627)NLEJ188987800 (DE-600)2012242-1 1573-2959 nnns volume:35 year:1995 month:02 pages:165-179 extent:15 http://dx.doi.org/10.1007/BF00633713 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 35 1995 2 165-179 15 |
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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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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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. |
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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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. |
| 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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition. |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000caa a22002652 4500</leader><controlfield tag="001">NLEJ193782766</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20210707214958.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">070526s1995 xx |||||o 00| ||eng c</controlfield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)NLEJ193782766</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rakwb</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Acid precipitation-related chemical trends in 18 rivers of atlantic Canada — 1983 to 1992</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1995</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">15</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zzz</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">z</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">nicht spezifiziert</subfield><subfield code="b">zu</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="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 (SO 4 − ) production in eastern Canada from 1982 to 1986, followed by a levelling off from 1986 to 1992. Nitrate (NO 3 − ) 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 SO 4 −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 SO 4 −2 exports as opposed to increased concentrations over the same period. We attribute the discrepancy between SO 4 −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 SO 4 − loads and is not yet being affected by the increases in NO 3 − deposition.</subfield></datafield><datafield tag="533" ind1=" " ind2=" "><subfield code="f">Springer Online Journal Archives 1860-2002</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Clair, Thomas A.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Ehrman, James M.</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">in</subfield><subfield code="t">Environmental monitoring and assessment</subfield><subfield code="d">1981</subfield><subfield code="g">35(1995) vom: Feb., Seite 165-179</subfield><subfield code="w">(DE-627)NLEJ188987800</subfield><subfield code="w">(DE-600)2012242-1</subfield><subfield code="x">1573-2959</subfield><subfield code="7">nnns</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:35</subfield><subfield code="g">year:1995</subfield><subfield code="g">month:02</subfield><subfield code="g">pages:165-179</subfield><subfield code="g">extent:15</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">http://dx.doi.org/10.1007/BF00633713</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">ZDB-1-SOJ</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_NL_ARTICLE</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">35</subfield><subfield code="j">1995</subfield><subfield code="c">2</subfield><subfield code="h">165-179</subfield><subfield code="g">15</subfield></datafield></record></collection>
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