Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water
American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New Orleans Element-calcium ratios in the skeleton of cold-water coral Desmophyllum dianthus represent potential archives for paleo-reconstruction of several ocean properties including temperature and nutrient concentrations. Howeve...
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ftcsic:oai:digital.csic.es:10261/275106 2024-02-11T09:56:09+01:00 Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water Ko, Stanley Sherrell, Robert M. Pelejero, Carles Martínez-Dios, Ariadna Lucas, Arturo Calvo, Eva María Kozdon, Reinhard Bostock, H. Tracey, Di 2020-12 http://hdl.handle.net/10261/275106 en eng American Geophysical Union Sí American Geophysical Union Fall Meeting (2020) http://hdl.handle.net/10261/275106 none comunicación de congreso 2020 ftcsic 2024-01-16T11:26:57Z American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New Orleans Element-calcium ratios in the skeleton of cold-water coral Desmophyllum dianthus represent potential archives for paleo-reconstruction of several ocean properties including temperature and nutrient concentrations. However, relatively large uncertainties in these proxy calibrations and heterogeneity in the skeletal composition have limited its application to date. We address these issues by analyzing corals cultured under systematically varied seawater conditions (phosphate, barium, temperature, pH, feeding frequency) over a two-year period, and refine the calibration of P/Ca, Ba/Ca, U/Ca, and Li/Mg proxies for seawater phosphate, barium, carbonate ion concentration, and temperature, respectively. Composition of the corals is determined using laser-ablation ICPMS, with robust plasma conditions established using the Normalized Argon Index [1], and proxy element incorporation is evaluated for influences of temperature, pH, and feeding frequency. The aragonite precipitated during the stages of the culturing experiment is identified using fluorescent and geochemical labelling of the skeleton through calcein and lead isotopes, respectively. This approach allows us to resolve monthly and annual increments in these slow growing (1-2mm/year) organisms, and also to evaluate the influence of calcification rate on the composition. We address the issue of heterogeneity by adapting methods for LA-ICPMS imaging to create macroscale images to reveal the full pattern of skeletogenesis and related compositional variability of D. dianthus. Preliminary images suggest that heterogeneity stems from the asymmetric precipitation of aragonite, and from centers of calcification (also known as early mineralization zones) that complicate the interpretation of elemental signals throughout the skeleton, but also help to identify new skeletal regions suitable for proxy measurement. Finally, we also discuss the role of endolithic organisms in some of these ... Conference Object Antarc* Antarctic Digital.CSIC (Spanish National Research Council) Antarctic Orleans ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
American Geophysical Union (AGU) Fall Meeting, 13-17 December 2021, New Orleans Element-calcium ratios in the skeleton of cold-water coral Desmophyllum dianthus represent potential archives for paleo-reconstruction of several ocean properties including temperature and nutrient concentrations. However, relatively large uncertainties in these proxy calibrations and heterogeneity in the skeletal composition have limited its application to date. We address these issues by analyzing corals cultured under systematically varied seawater conditions (phosphate, barium, temperature, pH, feeding frequency) over a two-year period, and refine the calibration of P/Ca, Ba/Ca, U/Ca, and Li/Mg proxies for seawater phosphate, barium, carbonate ion concentration, and temperature, respectively. Composition of the corals is determined using laser-ablation ICPMS, with robust plasma conditions established using the Normalized Argon Index [1], and proxy element incorporation is evaluated for influences of temperature, pH, and feeding frequency. The aragonite precipitated during the stages of the culturing experiment is identified using fluorescent and geochemical labelling of the skeleton through calcein and lead isotopes, respectively. This approach allows us to resolve monthly and annual increments in these slow growing (1-2mm/year) organisms, and also to evaluate the influence of calcification rate on the composition. We address the issue of heterogeneity by adapting methods for LA-ICPMS imaging to create macroscale images to reveal the full pattern of skeletogenesis and related compositional variability of D. dianthus. Preliminary images suggest that heterogeneity stems from the asymmetric precipitation of aragonite, and from centers of calcification (also known as early mineralization zones) that complicate the interpretation of elemental signals throughout the skeleton, but also help to identify new skeletal regions suitable for proxy measurement. Finally, we also discuss the role of endolithic organisms in some of these ... |
format |
Conference Object |
author |
Ko, Stanley Sherrell, Robert M. Pelejero, Carles Martínez-Dios, Ariadna Lucas, Arturo Calvo, Eva María Kozdon, Reinhard Bostock, H. Tracey, Di |
spellingShingle |
Ko, Stanley Sherrell, Robert M. Pelejero, Carles Martínez-Dios, Ariadna Lucas, Arturo Calvo, Eva María Kozdon, Reinhard Bostock, H. Tracey, Di Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
author_facet |
Ko, Stanley Sherrell, Robert M. Pelejero, Carles Martínez-Dios, Ariadna Lucas, Arturo Calvo, Eva María Kozdon, Reinhard Bostock, H. Tracey, Di |
author_sort |
Ko, Stanley |
title |
Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
title_short |
Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
title_full |
Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
title_fullStr |
Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
title_full_unstemmed |
Proxy Calibrations in the Cold-Water Coral Desmophyllum dianthus: Nutrient Concentrations in Antarctic Intermediate Water |
title_sort |
proxy calibrations in the cold-water coral desmophyllum dianthus: nutrient concentrations in antarctic intermediate water |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
http://hdl.handle.net/10261/275106 |
long_lat |
ENVELOPE(-60.667,-60.667,-63.950,-63.950) |
geographic |
Antarctic Orleans |
geographic_facet |
Antarctic Orleans |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Sí American Geophysical Union Fall Meeting (2020) http://hdl.handle.net/10261/275106 |
op_rights |
none |
_version_ |
1790600951276503040 |