Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea
Caribbean sea surface temperatures (SSTs) have increased at a rate of 0.2°C per decade since 1971, a rate double that of the mean global change. Recent investigations of the coral Siderastrea siderea on the Belize Mesoamerican Barrier Reef System (MBRS) have demonstrated that warming over the last 3...
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ftnerc:oai:nora.nerc.ac.uk:527423 2023-05-15T18:18:43+02:00 Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea Fowell, Sara E. Sandford, Kate Stewart, Joseph A. Castillo, Karl D. Ries, Justin B. Foster, Gavin L. 2016-11-11 text http://nora.nerc.ac.uk/id/eprint/527423/ https://nora.nerc.ac.uk/id/eprint/527423/1/2016PA002968.pdf https://doi.org/10.1002/2016PA002968 en eng https://nora.nerc.ac.uk/id/eprint/527423/1/2016PA002968.pdf Fowell, Sara E. orcid:0000-0002-9835-4725 Sandford, Kate; Stewart, Joseph A.; Castillo, Karl D.; Ries, Justin B.; Foster, Gavin L. 2016 Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea. Paleoceanography, 31 (10). 1315-1329. https://doi.org/10.1002/2016PA002968 <https://doi.org/10.1002/2016PA002968> cc_by_4 CC-BY Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.1002/2016PA002968 2023-02-04T19:50:31Z Caribbean sea surface temperatures (SSTs) have increased at a rate of 0.2°C per decade since 1971, a rate double that of the mean global change. Recent investigations of the coral Siderastrea siderea on the Belize Mesoamerican Barrier Reef System (MBRS) have demonstrated that warming over the last 30 years has had a detrimental impact on calcification. Instrumental temperature records in this region are sparse, making it necessary to reconstruct longer SST records indirectly through geochemical temperature proxies. Here we investigate the skeletal Sr/Ca and Li/Mg ratios of S. siderea from two distinct reef zones (forereef and backreef) of the MBRS. Our field calibrations of S. siderea show that Li/Mg and Sr/Ca ratios are well correlated with temperature, although both ratios are 3 times more sensitive to temperature change in the forereef than in the backreef. These differences suggest that a secondary parameter also influences these SST proxies, highlighting the importance for site‐ and species‐specific SST calibrations. Application of these paleothermometers to downcore samples reveals highly uncertain reconstructed temperatures in backreef coral, but well‐matched reconstructed temperatures in forereef coral, both between Sr/Ca‐SSTs and Li/Mg‐SSTs, and in comparison to the Hadley Centre Sea Ice and Sea Surface Temperature record. Reconstructions generated from a combined Sr/Ca and Li/Mg multiproxy calibration improve the precision of these SST reconstructions. This result confirms that there are circumstances in which both Li/Mg and Sr/Ca are reliable as stand‐alone and combined proxies of sea surface temperature. However, the results also highlight that high‐precision, site‐specific calibrations remain critical for reconstructing accurate SSTs from coral‐based elemental proxies. Article in Journal/Newspaper Sea ice Natural Environment Research Council: NERC Open Research Archive Paleoceanography 31 10 1315 1329 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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English |
description |
Caribbean sea surface temperatures (SSTs) have increased at a rate of 0.2°C per decade since 1971, a rate double that of the mean global change. Recent investigations of the coral Siderastrea siderea on the Belize Mesoamerican Barrier Reef System (MBRS) have demonstrated that warming over the last 30 years has had a detrimental impact on calcification. Instrumental temperature records in this region are sparse, making it necessary to reconstruct longer SST records indirectly through geochemical temperature proxies. Here we investigate the skeletal Sr/Ca and Li/Mg ratios of S. siderea from two distinct reef zones (forereef and backreef) of the MBRS. Our field calibrations of S. siderea show that Li/Mg and Sr/Ca ratios are well correlated with temperature, although both ratios are 3 times more sensitive to temperature change in the forereef than in the backreef. These differences suggest that a secondary parameter also influences these SST proxies, highlighting the importance for site‐ and species‐specific SST calibrations. Application of these paleothermometers to downcore samples reveals highly uncertain reconstructed temperatures in backreef coral, but well‐matched reconstructed temperatures in forereef coral, both between Sr/Ca‐SSTs and Li/Mg‐SSTs, and in comparison to the Hadley Centre Sea Ice and Sea Surface Temperature record. Reconstructions generated from a combined Sr/Ca and Li/Mg multiproxy calibration improve the precision of these SST reconstructions. This result confirms that there are circumstances in which both Li/Mg and Sr/Ca are reliable as stand‐alone and combined proxies of sea surface temperature. However, the results also highlight that high‐precision, site‐specific calibrations remain critical for reconstructing accurate SSTs from coral‐based elemental proxies. |
format |
Article in Journal/Newspaper |
author |
Fowell, Sara E. Sandford, Kate Stewart, Joseph A. Castillo, Karl D. Ries, Justin B. Foster, Gavin L. |
spellingShingle |
Fowell, Sara E. Sandford, Kate Stewart, Joseph A. Castillo, Karl D. Ries, Justin B. Foster, Gavin L. Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
author_facet |
Fowell, Sara E. Sandford, Kate Stewart, Joseph A. Castillo, Karl D. Ries, Justin B. Foster, Gavin L. |
author_sort |
Fowell, Sara E. |
title |
Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
title_short |
Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
title_full |
Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
title_fullStr |
Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
title_full_unstemmed |
Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea |
title_sort |
intrareef variations in li/mg and sr/ca sea surface temperature proxies in the caribbean reef-building coral siderastrea siderea |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/527423/ https://nora.nerc.ac.uk/id/eprint/527423/1/2016PA002968.pdf https://doi.org/10.1002/2016PA002968 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/527423/1/2016PA002968.pdf Fowell, Sara E. orcid:0000-0002-9835-4725 Sandford, Kate; Stewart, Joseph A.; Castillo, Karl D.; Ries, Justin B.; Foster, Gavin L. 2016 Intrareef variations in Li/Mg and Sr/Ca sea surface temperature proxies in the Caribbean reef-building coral Siderastrea siderea. Paleoceanography, 31 (10). 1315-1329. https://doi.org/10.1002/2016PA002968 <https://doi.org/10.1002/2016PA002968> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1002/2016PA002968 |
container_title |
Paleoceanography |
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31 |
container_issue |
10 |
container_start_page |
1315 |
op_container_end_page |
1329 |
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1766195397029527552 |