Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes
Abstract Global environmental change alters the production, terrestrial export, and photodegradation of organic carbon in northern lakes. Sedimentary biogeochemical records can provide a unique means to understand the nature of these changes over long time scales, where observational data fall short...
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Springer Science and Business Media LLC
2021
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Online Access: | http://dx.doi.org/10.1007/s10533-021-00820-9 https://link.springer.com/content/pdf/10.1007/s10533-021-00820-9.pdf https://link.springer.com/article/10.1007/s10533-021-00820-9/fulltext.html |
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crspringernat:10.1007/s10533-021-00820-9 2023-05-15T18:28:18+02:00 Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes Rantala, Marttiina V. Meyer-Jacob, Carsten Kivilä, E. Henriikka Luoto, Tomi P. Ojala, Antti. E. K. Smol, John P. Nevalainen, Liisa Academy of Finland Koneen Säätiö University of Helsinki including Helsinki University Central Hospital 2021 http://dx.doi.org/10.1007/s10533-021-00820-9 https://link.springer.com/content/pdf/10.1007/s10533-021-00820-9.pdf https://link.springer.com/article/10.1007/s10533-021-00820-9/fulltext.html en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Biogeochemistry volume 155, issue 2, page 169-188 ISSN 0168-2563 1573-515X Earth-Surface Processes Water Science and Technology Environmental Chemistry journal-article 2021 crspringernat https://doi.org/10.1007/s10533-021-00820-9 2022-01-04T14:33:30Z Abstract Global environmental change alters the production, terrestrial export, and photodegradation of organic carbon in northern lakes. Sedimentary biogeochemical records can provide a unique means to understand the nature of these changes over long time scales, where observational data fall short. We deployed in situ experiments on two shallow subarctic lakes with contrasting light regimes; a clear tundra lake and a dark woodland lake, to first investigate the photochemical transformation of carbon and nitrogen elemental (C/N ratio) and isotope (δ 13 C, δ 15 N) composition in lake water particulate organic matter (POM) for downcore inferences. We then explored elemental, isotopic, and spectral (inferred lake water total organic carbon [TOC] and sediment chlorophyll a [CHLa]) fingerprints in the lake sediments to trace changes in aquatic production, terrestrial inputs and photodegradation before and after profound human impacts on the global carbon cycle prompted by industrialization. POM pool in both lakes displayed tentative evidence of UV photoreactivity, reflected as increasing δ 13 C and decreasing C/N values. Through time, the tundra lake sediments traced subtle shifts in primary production, while the woodland lake carried signals of changing terrestrial contributions, indicating shifts in terrestrial carbon export but possibly also photodegradation rates. Under global human impact, both lakes irrespective of their distinct carbon regimes displayed evidence of increased productivity but no conspicuous signs of increased terrestrial influence. Overall, sediment biogeochemistry can integrate a wealth of information on carbon regulation in northern lakes, while our results also point to the importance of considering the entire spectrum of photobiogeochemical fingerprints in sedimentary studies. Article in Journal/Newspaper Subarctic Tundra Springer Nature (via Crossref) Biogeochemistry |
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Open Polar |
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Springer Nature (via Crossref) |
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crspringernat |
language |
English |
topic |
Earth-Surface Processes Water Science and Technology Environmental Chemistry |
spellingShingle |
Earth-Surface Processes Water Science and Technology Environmental Chemistry Rantala, Marttiina V. Meyer-Jacob, Carsten Kivilä, E. Henriikka Luoto, Tomi P. Ojala, Antti. E. K. Smol, John P. Nevalainen, Liisa Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
topic_facet |
Earth-Surface Processes Water Science and Technology Environmental Chemistry |
description |
Abstract Global environmental change alters the production, terrestrial export, and photodegradation of organic carbon in northern lakes. Sedimentary biogeochemical records can provide a unique means to understand the nature of these changes over long time scales, where observational data fall short. We deployed in situ experiments on two shallow subarctic lakes with contrasting light regimes; a clear tundra lake and a dark woodland lake, to first investigate the photochemical transformation of carbon and nitrogen elemental (C/N ratio) and isotope (δ 13 C, δ 15 N) composition in lake water particulate organic matter (POM) for downcore inferences. We then explored elemental, isotopic, and spectral (inferred lake water total organic carbon [TOC] and sediment chlorophyll a [CHLa]) fingerprints in the lake sediments to trace changes in aquatic production, terrestrial inputs and photodegradation before and after profound human impacts on the global carbon cycle prompted by industrialization. POM pool in both lakes displayed tentative evidence of UV photoreactivity, reflected as increasing δ 13 C and decreasing C/N values. Through time, the tundra lake sediments traced subtle shifts in primary production, while the woodland lake carried signals of changing terrestrial contributions, indicating shifts in terrestrial carbon export but possibly also photodegradation rates. Under global human impact, both lakes irrespective of their distinct carbon regimes displayed evidence of increased productivity but no conspicuous signs of increased terrestrial influence. Overall, sediment biogeochemistry can integrate a wealth of information on carbon regulation in northern lakes, while our results also point to the importance of considering the entire spectrum of photobiogeochemical fingerprints in sedimentary studies. |
author2 |
Academy of Finland Koneen Säätiö University of Helsinki including Helsinki University Central Hospital |
format |
Article in Journal/Newspaper |
author |
Rantala, Marttiina V. Meyer-Jacob, Carsten Kivilä, E. Henriikka Luoto, Tomi P. Ojala, Antti. E. K. Smol, John P. Nevalainen, Liisa |
author_facet |
Rantala, Marttiina V. Meyer-Jacob, Carsten Kivilä, E. Henriikka Luoto, Tomi P. Ojala, Antti. E. K. Smol, John P. Nevalainen, Liisa |
author_sort |
Rantala, Marttiina V. |
title |
Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
title_short |
Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
title_full |
Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
title_fullStr |
Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
title_full_unstemmed |
Traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
title_sort |
traces of sunlight in the organic matter biogeochemistry of two shallow subarctic lakes |
publisher |
Springer Science and Business Media LLC |
publishDate |
2021 |
url |
http://dx.doi.org/10.1007/s10533-021-00820-9 https://link.springer.com/content/pdf/10.1007/s10533-021-00820-9.pdf https://link.springer.com/article/10.1007/s10533-021-00820-9/fulltext.html |
genre |
Subarctic Tundra |
genre_facet |
Subarctic Tundra |
op_source |
Biogeochemistry volume 155, issue 2, page 169-188 ISSN 0168-2563 1573-515X |
op_rights |
https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1007/s10533-021-00820-9 |
container_title |
Biogeochemistry |
_version_ |
1766210713883246592 |