Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales
Abstract We present polar ice core organic matter (OM) fluorescence signatures to reconstruct ancient and modern atmospheric compositions and relate OM signals to past ecological changes. OM composition from three Arctic ice cores (Canada and Greenland) was characterized by fluorescence spectroscopy...
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Cambridge University Press (CUP)
2021
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Online Access: | http://dx.doi.org/10.1017/jog.2021.51 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000514 |
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crcambridgeupr:10.1017/jog.2021.51 2024-10-13T14:01:38+00:00 Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales D'Andrilli, Juliana McConnell, Joseph R. 2021 http://dx.doi.org/10.1017/jog.2021.51 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000514 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 67, issue 266, page 1028-1042 ISSN 0022-1430 1727-5652 journal-article 2021 crcambridgeupr https://doi.org/10.1017/jog.2021.51 2024-09-18T04:03:31Z Abstract We present polar ice core organic matter (OM) fluorescence signatures to reconstruct ancient and modern atmospheric compositions and relate OM signals to past ecological changes. OM composition from three Arctic ice cores (Canada and Greenland) was characterized by fluorescence spectroscopy and compared to an Antarctic OM record. Diverse OM was measured in ancient and modern ice in both hemispheres and similarities existed across vast spatiotemporal scales. We determined three OM markers, indicating paleoclimate and modern carbon trends: (i) ‘humic-like’, detected in Holocene ice of more complex and aromatic character, supporting trends of higher plant influences in warmer climates, (ii) monolignol- and non-amino acid-like, describing simple, lignin-like OM precursors ubiquitous in the environment and the microbial degradation products of more complex materials from plants/soils, and (iii) amino acid- and tannin-like, indicating microbial degradation of simple OM chemical species, compared to the other markers. Concentration trends were inferred from fluorescence intensities of individual OM types and related to warmer temperatures. No indicators of freshly produced OM by microbes were detected; signals were interpreted as materials externally produced from the ice and transported to polar regions. This marks the first global comparison of atmospheric reconstructions from OM across vast spatiotemporal scales. Article in Journal/Newspaper Antarc* Antarctic Arctic Greenland ice core Journal of Glaciology Cambridge University Press Antarctic Arctic Canada Greenland Journal of Glaciology 1 15 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract We present polar ice core organic matter (OM) fluorescence signatures to reconstruct ancient and modern atmospheric compositions and relate OM signals to past ecological changes. OM composition from three Arctic ice cores (Canada and Greenland) was characterized by fluorescence spectroscopy and compared to an Antarctic OM record. Diverse OM was measured in ancient and modern ice in both hemispheres and similarities existed across vast spatiotemporal scales. We determined three OM markers, indicating paleoclimate and modern carbon trends: (i) ‘humic-like’, detected in Holocene ice of more complex and aromatic character, supporting trends of higher plant influences in warmer climates, (ii) monolignol- and non-amino acid-like, describing simple, lignin-like OM precursors ubiquitous in the environment and the microbial degradation products of more complex materials from plants/soils, and (iii) amino acid- and tannin-like, indicating microbial degradation of simple OM chemical species, compared to the other markers. Concentration trends were inferred from fluorescence intensities of individual OM types and related to warmer temperatures. No indicators of freshly produced OM by microbes were detected; signals were interpreted as materials externally produced from the ice and transported to polar regions. This marks the first global comparison of atmospheric reconstructions from OM across vast spatiotemporal scales. |
format |
Article in Journal/Newspaper |
author |
D'Andrilli, Juliana McConnell, Joseph R. |
spellingShingle |
D'Andrilli, Juliana McConnell, Joseph R. Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
author_facet |
D'Andrilli, Juliana McConnell, Joseph R. |
author_sort |
D'Andrilli, Juliana |
title |
Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
title_short |
Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
title_full |
Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
title_fullStr |
Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
title_full_unstemmed |
Polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
title_sort |
polar ice core organic matter signatures reveal past atmospheric carbon composition and spatial trends across ancient and modern timescales |
publisher |
Cambridge University Press (CUP) |
publishDate |
2021 |
url |
http://dx.doi.org/10.1017/jog.2021.51 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021000514 |
geographic |
Antarctic Arctic Canada Greenland |
geographic_facet |
Antarctic Arctic Canada Greenland |
genre |
Antarc* Antarctic Arctic Greenland ice core Journal of Glaciology |
genre_facet |
Antarc* Antarctic Arctic Greenland ice core Journal of Glaciology |
op_source |
Journal of Glaciology volume 67, issue 266, page 1028-1042 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2021.51 |
container_title |
Journal of Glaciology |
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1 |
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15 |
_version_ |
1812811979942789120 |