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Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes
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| Zeitschriftentitel: | Limnology and Oceanography |
|---|---|
| Personen und Körperschaften: | , , , , , , |
| In: | Limnology and Oceanography, 63, 2018, 5, S. 2250-2265 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Wiley
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| Schlagwörter: |
| author_facet |
Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. |
|---|---|
| author |
Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. |
| spellingShingle |
Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. Limnology and Oceanography Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes Aquatic Science Oceanography |
| author_sort |
anderson, n. j. |
| spelling |
Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. 0024-3590 1939-5590 Wiley Aquatic Science Oceanography http://dx.doi.org/10.1002/lno.10936 <jats:title>Abstract</jats:title><jats:p>Disruption of the nitrogen cycle is a major component of global environmental change. δ<jats:sup>15</jats:sup>N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ<jats:sup>15</jats:sup>N signal is not recorded at all sites. We used a regionally replicated sampling strategy along a precipitation and N‐deposition gradient in SW Greenland to assess the factors determining the strength of δ<jats:sup>15</jats:sup>N signal in lake sediment cores. Analyses of snowpack N and δ<jats:sup>15</jats:sup>N‐NO<jats:sub>3</jats:sub> and water chemistry were coupled with bulk sediment δ<jats:sup>15</jats:sup>N. Study sites cover a gradient of snowpack δ<jats:sup>15</jats:sup>N (ice sheet: −6‰; coast <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0001.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0001" />10‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>; coast: 0.4 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>) and limnology. Three <jats:sup>210</jats:sup>Pb‐dated sediment cores from coastal lakes showed a decline in δ<jats:sup>15</jats:sup>N of ca. <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0002.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0002" />1‰ from ∼ 1860, reflecting the strongly depleted δ<jats:sup>15</jats:sup>N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 <jats:italic>μ</jats:italic>g N L<jats:sup>−1</jats:sup>) and a higher TN‐load. Coastal lakes have 3.7–7.1× more snowpack input of nitrate than inland sites, while for total deposition the values are 1.7–3.6× greater for lake and whole catchment deposition. At inland sites and lakes close to the ice‐sheet margin, a lower atmospheric N deposition rate and larger in‐lake TN pool resulted in greater reliance on N‐fixation and recycling (mean sediment δ<jats:sup>15</jats:sup>N is 0.5–2.5‰ in most inland lakes; <jats:italic>n</jats:italic> = 6). The primary control of the transfer of the atmospheric δ<jats:sup>15</jats:sup>N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool.</jats:p> Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes Limnology and Oceanography |
| doi_str_mv |
10.1002/lno.10936 |
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Online Free |
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Biologie Allgemeine Naturwissenschaft |
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ElectronicArticle |
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Wiley, 2018 |
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Wiley, 2018 |
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0024-3590 1939-5590 |
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| title |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_unstemmed |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_full |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_fullStr |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_full_unstemmed |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_short |
Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_sort |
regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in greenland lakes |
| topic |
Aquatic Science Oceanography |
| url |
http://dx.doi.org/10.1002/lno.10936 |
| publishDate |
2018 |
| physical |
2250-2265 |
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<jats:title>Abstract</jats:title><jats:p>Disruption of the nitrogen cycle is a major component of global environmental change. δ<jats:sup>15</jats:sup>N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ<jats:sup>15</jats:sup>N signal is not recorded at all sites. We used a regionally replicated sampling strategy along a precipitation and N‐deposition gradient in SW Greenland to assess the factors determining the strength of δ<jats:sup>15</jats:sup>N signal in lake sediment cores. Analyses of snowpack N and δ<jats:sup>15</jats:sup>N‐NO<jats:sub>3</jats:sub> and water chemistry were coupled with bulk sediment δ<jats:sup>15</jats:sup>N. Study sites cover a gradient of snowpack δ<jats:sup>15</jats:sup>N (ice sheet: −6‰; coast
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0001.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0001" />10‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>; coast: 0.4 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>) and limnology. Three <jats:sup>210</jats:sup>Pb‐dated sediment cores from coastal lakes showed a decline in δ<jats:sup>15</jats:sup>N of ca.
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0002.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0002" />1‰ from ∼ 1860, reflecting the strongly depleted δ<jats:sup>15</jats:sup>N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 <jats:italic>μ</jats:italic>g N L<jats:sup>−1</jats:sup>) and a higher TN‐load. Coastal lakes have 3.7–7.1× more snowpack input of nitrate than inland sites, while for total deposition the values are 1.7–3.6× greater for lake and whole catchment deposition. At inland sites and lakes close to the ice‐sheet margin, a lower atmospheric N deposition rate and larger in‐lake TN pool resulted in greater reliance on N‐fixation and recycling (mean sediment δ<jats:sup>15</jats:sup>N is 0.5–2.5‰ in most inland lakes; <jats:italic>n</jats:italic> = 6). The primary control of the transfer of the atmospheric δ<jats:sup>15</jats:sup>N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool.</jats:p> |
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| description | <jats:title>Abstract</jats:title><jats:p>Disruption of the nitrogen cycle is a major component of global environmental change. δ<jats:sup>15</jats:sup>N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ<jats:sup>15</jats:sup>N signal is not recorded at all sites. We used a regionally replicated sampling strategy along a precipitation and N‐deposition gradient in SW Greenland to assess the factors determining the strength of δ<jats:sup>15</jats:sup>N signal in lake sediment cores. Analyses of snowpack N and δ<jats:sup>15</jats:sup>N‐NO<jats:sub>3</jats:sub> and water chemistry were coupled with bulk sediment δ<jats:sup>15</jats:sup>N. Study sites cover a gradient of snowpack δ<jats:sup>15</jats:sup>N (ice sheet: −6‰; coast <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0001.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0001" />10‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>; coast: 0.4 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>) and limnology. Three <jats:sup>210</jats:sup>Pb‐dated sediment cores from coastal lakes showed a decline in δ<jats:sup>15</jats:sup>N of ca. <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0002.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0002" />1‰ from ∼ 1860, reflecting the strongly depleted δ<jats:sup>15</jats:sup>N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 <jats:italic>μ</jats:italic>g N L<jats:sup>−1</jats:sup>) and a higher TN‐load. Coastal lakes have 3.7–7.1× more snowpack input of nitrate than inland sites, while for total deposition the values are 1.7–3.6× greater for lake and whole catchment deposition. At inland sites and lakes close to the ice‐sheet margin, a lower atmospheric N deposition rate and larger in‐lake TN pool resulted in greater reliance on N‐fixation and recycling (mean sediment δ<jats:sup>15</jats:sup>N is 0.5–2.5‰ in most inland lakes; <jats:italic>n</jats:italic> = 6). The primary control of the transfer of the atmospheric δ<jats:sup>15</jats:sup>N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool.</jats:p> |
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| imprint | Wiley, 2018 |
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| spelling | Anderson, N. J. Curtis, C. J. Whiteford, E. J. Jones, V. J. McGowan, S. Simpson, G. L. Kaiser, J. 0024-3590 1939-5590 Wiley Aquatic Science Oceanography http://dx.doi.org/10.1002/lno.10936 <jats:title>Abstract</jats:title><jats:p>Disruption of the nitrogen cycle is a major component of global environmental change. δ<jats:sup>15</jats:sup>N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ<jats:sup>15</jats:sup>N signal is not recorded at all sites. We used a regionally replicated sampling strategy along a precipitation and N‐deposition gradient in SW Greenland to assess the factors determining the strength of δ<jats:sup>15</jats:sup>N signal in lake sediment cores. Analyses of snowpack N and δ<jats:sup>15</jats:sup>N‐NO<jats:sub>3</jats:sub> and water chemistry were coupled with bulk sediment δ<jats:sup>15</jats:sup>N. Study sites cover a gradient of snowpack δ<jats:sup>15</jats:sup>N (ice sheet: −6‰; coast <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0001.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0001" />10‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>; coast: 0.4 kg ha<jats:sup>−1</jats:sup> yr<jats:sup>−1</jats:sup>) and limnology. Three <jats:sup>210</jats:sup>Pb‐dated sediment cores from coastal lakes showed a decline in δ<jats:sup>15</jats:sup>N of ca. <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/lno10936-math-0002.png" xlink:title="urn:x-wiley:00243590:media:lno10936:lno10936-math-0002" />1‰ from ∼ 1860, reflecting the strongly depleted δ<jats:sup>15</jats:sup>N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 <jats:italic>μ</jats:italic>g N L<jats:sup>−1</jats:sup>) and a higher TN‐load. Coastal lakes have 3.7–7.1× more snowpack input of nitrate than inland sites, while for total deposition the values are 1.7–3.6× greater for lake and whole catchment deposition. At inland sites and lakes close to the ice‐sheet margin, a lower atmospheric N deposition rate and larger in‐lake TN pool resulted in greater reliance on N‐fixation and recycling (mean sediment δ<jats:sup>15</jats:sup>N is 0.5–2.5‰ in most inland lakes; <jats:italic>n</jats:italic> = 6). The primary control of the transfer of the atmospheric δ<jats:sup>15</jats:sup>N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool.</jats:p> Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes Limnology and Oceanography |
| spellingShingle | Anderson, N. J., Curtis, C. J., Whiteford, E. J., Jones, V. J., McGowan, S., Simpson, G. L., Kaiser, J., Limnology and Oceanography, Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes, Aquatic Science, Oceanography |
| title | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_full | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_fullStr | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_full_unstemmed | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_short | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| title_sort | regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in greenland lakes |
| title_unstemmed | Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
| topic | Aquatic Science, Oceanography |
| url | http://dx.doi.org/10.1002/lno.10936 |