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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ftloughboroughun:oai:figshare.com:article/9482837 2023-05-15T16:28:26+02:00 Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes Nicholas John Anderson Chris J. Curtis Erika J. Whiteford Vivienne J. Jones Suzanne McGowan Gavin L. Simpson Jan Kaiser 2018-07-17T00:00:00Z https://figshare.com/articles/journal_contribution/Regional_variability_in_the_atmospheric_nitrogen_deposition_signal_and_its_transfer_to_the_sediment_record_in_Greenland_lakes/9482837 unknown 2134/34401 https://figshare.com/articles/journal_contribution/Regional_variability_in_the_atmospheric_nitrogen_deposition_signal_and_its_transfer_to_the_sediment_record_in_Greenland_lakes/9482837 CC BY 4.0 CC-BY Earth Sciences not elsewhere classified untagged Text Journal contribution 2018 ftloughboroughun 2022-01-01T19:43:10Z 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. Other Non-Article Part of Journal/Newspaper Greenland Ice Sheet Loughborough University: Figshare Greenland |
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Loughborough University: Figshare |
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ftloughboroughun |
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Earth Sciences not elsewhere classified untagged |
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Earth Sciences not elsewhere classified untagged Nicholas John Anderson Chris J. Curtis Erika J. Whiteford Vivienne J. Jones Suzanne McGowan Gavin L. Simpson Jan Kaiser Regional variability in the atmospheric nitrogen deposition signal and its transfer to the sediment record in Greenland lakes |
topic_facet |
Earth Sciences not elsewhere classified untagged |
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 |
Other Non-Article Part of Journal/Newspaper |
author |
Nicholas John Anderson Chris J. Curtis Erika J. Whiteford Vivienne J. Jones Suzanne McGowan Gavin L. Simpson Jan Kaiser |
author_facet |
Nicholas John Anderson Chris J. Curtis Erika J. Whiteford Vivienne J. Jones Suzanne McGowan Gavin L. Simpson Jan Kaiser |
author_sort |
Nicholas John Anderson |
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 |
publishDate |
2018 |
url |
https://figshare.com/articles/journal_contribution/Regional_variability_in_the_atmospheric_nitrogen_deposition_signal_and_its_transfer_to_the_sediment_record_in_Greenland_lakes/9482837 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
2134/34401 https://figshare.com/articles/journal_contribution/Regional_variability_in_the_atmospheric_nitrogen_deposition_signal_and_its_transfer_to_the_sediment_record_in_Greenland_lakes/9482837 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
_version_ |
1766018088379088896 |