Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes
Disruption of the nitrogen cycle is a major component of global environmental change. δ15N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ15N signal is not recorded at all sites. We used a regionally replicated samplin...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:10058149 2023-12-24T10:17:10+01:00 Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes Anderson, NJ Curtis, CJ Whiteford, EJ Jones, VJ McGowan, S Simpson, GL Kaiser, J 2018-09 text https://discovery.ucl.ac.uk/id/eprint/10058149/1/Anderson%20et%20al%20L%26O%202018%20Greenland%20N.pdf https://discovery.ucl.ac.uk/id/eprint/10058149/ eng eng WILEY https://discovery.ucl.ac.uk/id/eprint/10058149/1/Anderson%20et%20al%20L%26O%202018%20Greenland%20N.pdf https://discovery.ucl.ac.uk/id/eprint/10058149/ open Limnology and Oceanography , 63 (5) pp. 2250-2265. (2018) Article 2018 ftucl 2023-11-27T13:07:32Z Disruption of the nitrogen cycle is a major component of global environmental change. δ15N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ15N 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 δ15N signal in lake sediment cores. Analyses of snowpack N and δ15N‐NO3 and water chemistry were coupled with bulk sediment δ15N. Study sites cover a gradient of snowpack δ15N (ice sheet: −6‰; coast urn:x-wiley:00243590:media:lno10936:lno10936-math-000110‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha−1 yr−1; coast: 0.4 kg ha−1 yr−1) and limnology. Three 210Pb‐dated sediment cores from coastal lakes showed a decline in δ15N of ca. urn:x-wiley:00243590:media:lno10936:lno10936-math-00021‰ from ∼ 1860, reflecting the strongly depleted δ15N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 μg N L−1) 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 δ15N is 0.5–2.5‰ in most inland lakes; n = 6). The primary control of the transfer of the atmospheric δ15N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool. Article in Journal/Newspaper Greenland Ice Sheet University College London: UCL Discovery Greenland |
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Open Polar |
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University College London: UCL Discovery |
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ftucl |
language |
English |
description |
Disruption of the nitrogen cycle is a major component of global environmental change. δ15N in lake sediments is increasingly used as a measure of reactive nitrogen input but problematically, the characteristic depleted δ15N 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 δ15N signal in lake sediment cores. Analyses of snowpack N and δ15N‐NO3 and water chemistry were coupled with bulk sediment δ15N. Study sites cover a gradient of snowpack δ15N (ice sheet: −6‰; coast urn:x-wiley:00243590:media:lno10936:lno10936-math-000110‰), atmospheric N deposition (ice sheet margin: ∼ 0.2 kg ha−1 yr−1; coast: 0.4 kg ha−1 yr−1) and limnology. Three 210Pb‐dated sediment cores from coastal lakes showed a decline in δ15N of ca. urn:x-wiley:00243590:media:lno10936:lno10936-math-00021‰ from ∼ 1860, reflecting the strongly depleted δ15N of snowpack N, lower in‐lake total N (TN) concentration (∼ 300 μg N L−1) 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 δ15N is 0.5–2.5‰ in most inland lakes; n = 6). The primary control of the transfer of the atmospheric δ15N deposition signal to lake sediments is the magnitude of external N inputs relative to the in‐lake N‐pool. |
format |
Article in Journal/Newspaper |
author |
Anderson, NJ Curtis, CJ Whiteford, EJ Jones, VJ McGowan, S Simpson, GL Kaiser, J |
spellingShingle |
Anderson, NJ Curtis, CJ Whiteford, EJ Jones, VJ McGowan, S Simpson, GL Kaiser, J Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
author_facet |
Anderson, NJ Curtis, CJ Whiteford, EJ Jones, VJ McGowan, S Simpson, GL Kaiser, J |
author_sort |
Anderson, NJ |
title |
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_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_sort |
regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in greenland lakes |
publisher |
WILEY |
publishDate |
2018 |
url |
https://discovery.ucl.ac.uk/id/eprint/10058149/1/Anderson%20et%20al%20L%26O%202018%20Greenland%20N.pdf https://discovery.ucl.ac.uk/id/eprint/10058149/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Limnology and Oceanography , 63 (5) pp. 2250-2265. (2018) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/10058149/1/Anderson%20et%20al%20L%26O%202018%20Greenland%20N.pdf https://discovery.ucl.ac.uk/id/eprint/10058149/ |
op_rights |
open |
_version_ |
1786205103878832128 |