Multi-colony calibrations of coral Ba/Ca with a contemporaneous in situ seawater barium record
The coral skeleton barium to calcium ratio (Ba/Cacoral), a proxy for seawater barium concentrations (BaSW), has been interpreted as a tracer of upwelling based on the characteristic “nutrient like” depth profile of BaSW. However, in some tropical regions, such as the Gulf of Panamá, substantial infl...
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| Veröffentlicht in: | Geochimica et cosmochimica acta 2016-04, Vol.179, p.203-216 |
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| creator | LaVigne, Michèle Grottoli, Andréa G. Palardy, James E. Sherrell, Robert M. |
| description | The coral skeleton barium to calcium ratio (Ba/Cacoral), a proxy for seawater barium concentrations (BaSW), has been interpreted as a tracer of upwelling based on the characteristic “nutrient like” depth profile of BaSW. However, in some tropical regions, such as the Gulf of Panamá, substantial influence of terrestrial runoff inputs and differences between the vertical distribution of BaSW and that of the major nutrients (nitrate and phosphate) in the upper water column can complicate the interpretation of Ba/Cacoral as an upwelled nutrient proxy. In the Gulf of Panamá, contemporaneous Ba/Cacoral records from multiple colonies of Porites lobata, Pavona gigantea, and Pavona clavus corals record a nearly twofold change in surface water BaSW as a 20–70% increase in skeletal Ba/Ca with excellent correlation among Ba/Ca records from co-located colonies (r=0.86–0.99). These results provide, for the first time, an absolute calibration of the coral Ba proxy with a contemporaneous BaSW record. Compiling the Ba/Cacoral records from three co-located colonies of each species into taxon-specific composite regressions reveals strong statistically significant correlations with the BaSW time-series record (p |
| doi_str_mv | 10.1016/j.gca.2015.12.038 |
| format | Article |
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However, in some tropical regions, such as the Gulf of Panamá, substantial influence of terrestrial runoff inputs and differences between the vertical distribution of BaSW and that of the major nutrients (nitrate and phosphate) in the upper water column can complicate the interpretation of Ba/Cacoral as an upwelled nutrient proxy. In the Gulf of Panamá, contemporaneous Ba/Cacoral records from multiple colonies of Porites lobata, Pavona gigantea, and Pavona clavus corals record a nearly twofold change in surface water BaSW as a 20–70% increase in skeletal Ba/Ca with excellent correlation among Ba/Ca records from co-located colonies (r=0.86–0.99). These results provide, for the first time, an absolute calibration of the coral Ba proxy with a contemporaneous BaSW record. Compiling the Ba/Cacoral records from three co-located colonies of each species into taxon-specific composite regressions reveals strong statistically significant correlations with the BaSW time-series record (p<0.001). Differences among taxa in regression slope, y-intercept, and average distribution coefficient, as well as a demonstration of the application of the P. clavus calibration to a previously published Ba/Cacoral record, emphasize the necessity of using taxon-specific calibrations to reconstruct changes in BaSW with accuracy. 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However, in some tropical regions, such as the Gulf of Panamá, substantial influence of terrestrial runoff inputs and differences between the vertical distribution of BaSW and that of the major nutrients (nitrate and phosphate) in the upper water column can complicate the interpretation of Ba/Cacoral as an upwelled nutrient proxy. In the Gulf of Panamá, contemporaneous Ba/Cacoral records from multiple colonies of Porites lobata, Pavona gigantea, and Pavona clavus corals record a nearly twofold change in surface water BaSW as a 20–70% increase in skeletal Ba/Ca with excellent correlation among Ba/Ca records from co-located colonies (r=0.86–0.99). These results provide, for the first time, an absolute calibration of the coral Ba proxy with a contemporaneous BaSW record. Compiling the Ba/Cacoral records from three co-located colonies of each species into taxon-specific composite regressions reveals strong statistically significant correlations with the BaSW time-series record (p<0.001). Differences among taxa in regression slope, y-intercept, and average distribution coefficient, as well as a demonstration of the application of the P. clavus calibration to a previously published Ba/Cacoral record, emphasize the necessity of using taxon-specific calibrations to reconstruct changes in BaSW with accuracy. These results support the application of Ba/Cacoral to reconstruct past changes in absolute BaSW concentrations, adding an important tool to the collection of geochemical proxies for reconstructing surface ocean biogeochemical processes in the past.</description><subject>Brackish</subject><subject>Calcium</subject><subject>Calibration</subject><subject>Colonies</subject><subject>Corals</subject><subject>Correlation</subject><subject>Gulfs</subject><subject>Marine</subject><subject>Nutrients</subject><subject>Sea water</subject><issn>0016-7037</issn><issn>1872-9533</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqFkMtOxCAUhonRxPHyAO5Yumk9lFKGuNKJt0TjRreSU0qVSaeMQDXz9jIZ17oiOfzfuXyEnDEoGbDmYlm-GywrYKJkVQl8vkdmbC6rQgnO98kMcqiQwOUhOYpxCQBSCJiRt6dpSK4wfvDjhhocXBswOT9G6ntqfMCBXuPFAum3Sx8Uc2lMdrXOH6P1U6RupNGliUaL35hsoC0GN61osBnuTshBj0O0p7_vMXm9vXlZ3BePz3cPi6vHwtTQpKIWvAEQFTaqNZ0F2QlVdcgQmRSMq7afi7ZtjapbZRiTkvU1cuSmR1PXXc2Pyfmu7zr4z8nGpFcuGjsMuy01m4NqqgryoH-jUoHi0NQyR9kuaoKPMdher4NbYdhoBnqrXS911q632jWrdNaemcsdY_O5X84GHY2zo7Gdy0qS7rz7g_4BwkOK2w</recordid><startdate>20160415</startdate><enddate>20160415</enddate><creator>LaVigne, Michèle</creator><creator>Grottoli, Andréa G.</creator><creator>Palardy, James E.</creator><creator>Sherrell, Robert M.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20160415</creationdate><title>Multi-colony calibrations of coral Ba/Ca with a contemporaneous in situ seawater barium record</title><author>LaVigne, Michèle ; Grottoli, Andréa G. ; Palardy, James E. ; Sherrell, Robert M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c406t-45360052a69bcde07d592da1aa175139bf85bbbc94b9c11771f4a3a3cfac44d43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Brackish</topic><topic>Calcium</topic><topic>Calibration</topic><topic>Colonies</topic><topic>Corals</topic><topic>Correlation</topic><topic>Gulfs</topic><topic>Marine</topic><topic>Nutrients</topic><topic>Sea water</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>LaVigne, Michèle</creatorcontrib><creatorcontrib>Grottoli, Andréa G.</creatorcontrib><creatorcontrib>Palardy, James E.</creatorcontrib><creatorcontrib>Sherrell, Robert M.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geochimica et cosmochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>LaVigne, Michèle</au><au>Grottoli, Andréa G.</au><au>Palardy, James E.</au><au>Sherrell, Robert M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Multi-colony calibrations of coral Ba/Ca with a contemporaneous in situ seawater barium record</atitle><jtitle>Geochimica et cosmochimica acta</jtitle><date>2016-04-15</date><risdate>2016</risdate><volume>179</volume><spage>203</spage><epage>216</epage><pages>203-216</pages><issn>0016-7037</issn><eissn>1872-9533</eissn><abstract>The coral skeleton barium to calcium ratio (Ba/Cacoral), a proxy for seawater barium concentrations (BaSW), has been interpreted as a tracer of upwelling based on the characteristic “nutrient like” depth profile of BaSW. However, in some tropical regions, such as the Gulf of Panamá, substantial influence of terrestrial runoff inputs and differences between the vertical distribution of BaSW and that of the major nutrients (nitrate and phosphate) in the upper water column can complicate the interpretation of Ba/Cacoral as an upwelled nutrient proxy. In the Gulf of Panamá, contemporaneous Ba/Cacoral records from multiple colonies of Porites lobata, Pavona gigantea, and Pavona clavus corals record a nearly twofold change in surface water BaSW as a 20–70% increase in skeletal Ba/Ca with excellent correlation among Ba/Ca records from co-located colonies (r=0.86–0.99). These results provide, for the first time, an absolute calibration of the coral Ba proxy with a contemporaneous BaSW record. Compiling the Ba/Cacoral records from three co-located colonies of each species into taxon-specific composite regressions reveals strong statistically significant correlations with the BaSW time-series record (p<0.001). Differences among taxa in regression slope, y-intercept, and average distribution coefficient, as well as a demonstration of the application of the P. clavus calibration to a previously published Ba/Cacoral record, emphasize the necessity of using taxon-specific calibrations to reconstruct changes in BaSW with accuracy. These results support the application of Ba/Cacoral to reconstruct past changes in absolute BaSW concentrations, adding an important tool to the collection of geochemical proxies for reconstructing surface ocean biogeochemical processes in the past.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.gca.2015.12.038</doi><tpages>14</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Brackish Calcium Calibration Colonies Corals Correlation Gulfs Marine Nutrients Sea water |
| title | Multi-colony calibrations of coral Ba/Ca with a contemporaneous in situ seawater barium record |
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