Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments
A solid understanding of global oceanic change throughout Holocene time is needed to contextualize and interpret recent observations of rapid warming (Moore, 2016), ocean acidification (Popova et al., 2014; Qi et al., 2017), increasing meltwater input (Halfar et al., 2013; Notz and Stroeve, 2016) an...
Published in: | Geochimica et Cosmochimica Acta |
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Online Access: | https://oceanrep.geomar.de/id/eprint/46124/ https://oceanrep.geomar.de/id/eprint/46124/1/Anagnostou%20et.al.pdf https://oceanrep.geomar.de/id/eprint/46124/7/Anagnostou_Supplement.pdf https://oceanrep.geomar.de/id/eprint/46124/13/Anagnostou2019_submBFfinalproof.pdf https://doi.org/10.1016/j.gca.2019.03.015 |
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ftoceanrep:oai:oceanrep.geomar.de:46124 2023-05-15T15:15:27+02:00 Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments Anagnostou, Eleni Williams, Branwen Westfield, Isaac Foster, Gavin Ries, Justin 2019-06-01 text https://oceanrep.geomar.de/id/eprint/46124/ https://oceanrep.geomar.de/id/eprint/46124/1/Anagnostou%20et.al.pdf https://oceanrep.geomar.de/id/eprint/46124/7/Anagnostou_Supplement.pdf https://oceanrep.geomar.de/id/eprint/46124/13/Anagnostou2019_submBFfinalproof.pdf https://doi.org/10.1016/j.gca.2019.03.015 en eng Elsevier https://oceanrep.geomar.de/id/eprint/46124/1/Anagnostou%20et.al.pdf https://oceanrep.geomar.de/id/eprint/46124/7/Anagnostou_Supplement.pdf https://oceanrep.geomar.de/id/eprint/46124/13/Anagnostou2019_submBFfinalproof.pdf Anagnostou, E. , Williams, B., Westfield, I., Foster, G. and Ries, J. (2019) Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments . Open Access Geochimica et Cosmochimica Acta, 254 . pp. 142-155. DOI 10.1016/j.gca.2019.03.015 <https://doi.org/10.1016/j.gca.2019.03.015>. doi:10.1016/j.gca.2019.03.015 cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1016/j.gca.2019.03.015 2023-04-07T15:44:22Z A solid understanding of global oceanic change throughout Holocene time is needed to contextualize and interpret recent observations of rapid warming (Moore, 2016), ocean acidification (Popova et al., 2014; Qi et al., 2017), increasing meltwater input (Halfar et al., 2013; Notz and Stroeve, 2016) and circulation changes (Liu et al., 2017; Rahmstorf et al., 2015; Yang et al., 2016) in the Arctic and subarctic Oceans. Precisely reconstructing acidification and temperature variations throughout the Holocene will provide a vital context for interpreting current environmental changes and future climate projections in the region. However, existing paleoenvironmental reconstructions are sparse and uncertain, largely owing to limited availability of high fidelity paleoceanographic archives, such as marine carbonates, in high latitude waters. Coralline algae of the genus Clathromorphum have emerged as key candidates for reconstructing high-latitude environmental variability at annual to sub-annual resolution. Here, we present the first empirical calibrations of boron isotope-pH and Mg/Li-temperature relationships within the long-lived, crustose coralline red alga Clathromorphum compactum. Calibration experiments were performed in triplicate, growing wild-collected specimens for four months at three controlled temperatures (6.4 – 12.4 oC) and four pCO2 conditions (352 - 3230 ppm), to test the effects of these environmental parameters on the isotopic and elemental composition of the algal skeleton. We find that boron isotopes within the skeleton of C. compactum (δ11Bcc) are well correlated with δ11B of seawater borate (δ11Βborate), defining the following equation: δ11Βcc (2σ) = 1.46 (0.06) δ11Βborate + 6.91 (0.72). This equation can be used to reconstruct δ11Βborate of the coralline alga’s ambient seawater, from which past seawater pH can be calculated. We also identified a strong correlation between skeletal Mg/Li ratio and seawater temperature, defined by the equation: Mg/Li (2σ) = 0.17 (0.02) temperature (oC) + 1.02 ... Article in Journal/Newspaper Arctic Ocean acidification Subarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Popova ENVELOPE(49.633,49.633,67.383,67.383) Geochimica et Cosmochimica Acta 254 142 155 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
A solid understanding of global oceanic change throughout Holocene time is needed to contextualize and interpret recent observations of rapid warming (Moore, 2016), ocean acidification (Popova et al., 2014; Qi et al., 2017), increasing meltwater input (Halfar et al., 2013; Notz and Stroeve, 2016) and circulation changes (Liu et al., 2017; Rahmstorf et al., 2015; Yang et al., 2016) in the Arctic and subarctic Oceans. Precisely reconstructing acidification and temperature variations throughout the Holocene will provide a vital context for interpreting current environmental changes and future climate projections in the region. However, existing paleoenvironmental reconstructions are sparse and uncertain, largely owing to limited availability of high fidelity paleoceanographic archives, such as marine carbonates, in high latitude waters. Coralline algae of the genus Clathromorphum have emerged as key candidates for reconstructing high-latitude environmental variability at annual to sub-annual resolution. Here, we present the first empirical calibrations of boron isotope-pH and Mg/Li-temperature relationships within the long-lived, crustose coralline red alga Clathromorphum compactum. Calibration experiments were performed in triplicate, growing wild-collected specimens for four months at three controlled temperatures (6.4 – 12.4 oC) and four pCO2 conditions (352 - 3230 ppm), to test the effects of these environmental parameters on the isotopic and elemental composition of the algal skeleton. We find that boron isotopes within the skeleton of C. compactum (δ11Bcc) are well correlated with δ11B of seawater borate (δ11Βborate), defining the following equation: δ11Βcc (2σ) = 1.46 (0.06) δ11Βborate + 6.91 (0.72). This equation can be used to reconstruct δ11Βborate of the coralline alga’s ambient seawater, from which past seawater pH can be calculated. We also identified a strong correlation between skeletal Mg/Li ratio and seawater temperature, defined by the equation: Mg/Li (2σ) = 0.17 (0.02) temperature (oC) + 1.02 ... |
format |
Article in Journal/Newspaper |
author |
Anagnostou, Eleni Williams, Branwen Westfield, Isaac Foster, Gavin Ries, Justin |
spellingShingle |
Anagnostou, Eleni Williams, Branwen Westfield, Isaac Foster, Gavin Ries, Justin Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
author_facet |
Anagnostou, Eleni Williams, Branwen Westfield, Isaac Foster, Gavin Ries, Justin |
author_sort |
Anagnostou, Eleni |
title |
Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
title_short |
Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
title_full |
Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
title_fullStr |
Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
title_full_unstemmed |
Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments |
title_sort |
calibration of the ph-δ11b and temperature-mg/li proxies in the long-lived high-latitude crustose coralline red alga clathromorphum compactum via controlled laboratory experiments |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/46124/ https://oceanrep.geomar.de/id/eprint/46124/1/Anagnostou%20et.al.pdf https://oceanrep.geomar.de/id/eprint/46124/7/Anagnostou_Supplement.pdf https://oceanrep.geomar.de/id/eprint/46124/13/Anagnostou2019_submBFfinalproof.pdf https://doi.org/10.1016/j.gca.2019.03.015 |
long_lat |
ENVELOPE(49.633,49.633,67.383,67.383) |
geographic |
Arctic Popova |
geographic_facet |
Arctic Popova |
genre |
Arctic Ocean acidification Subarctic |
genre_facet |
Arctic Ocean acidification Subarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/46124/1/Anagnostou%20et.al.pdf https://oceanrep.geomar.de/id/eprint/46124/7/Anagnostou_Supplement.pdf https://oceanrep.geomar.de/id/eprint/46124/13/Anagnostou2019_submBFfinalproof.pdf Anagnostou, E. , Williams, B., Westfield, I., Foster, G. and Ries, J. (2019) Calibration of the pH-δ11B and temperature-Mg/Li proxies in the long-lived high-latitude crustose coralline red alga Clathromorphum compactum via controlled laboratory experiments . Open Access Geochimica et Cosmochimica Acta, 254 . pp. 142-155. DOI 10.1016/j.gca.2019.03.015 <https://doi.org/10.1016/j.gca.2019.03.015>. doi:10.1016/j.gca.2019.03.015 |
op_rights |
cc_by_nc_nd_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gca.2019.03.015 |
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