Files in this item
The effects of temperature, salinity, and the carbonate system on Mg/Ca in Globigerinoides ruber (white) : a global sediment trap calibration
Item metadata
dc.contributor.author | Gray, William R. | |
dc.contributor.author | Weldeab, Syee | |
dc.contributor.author | Lea, David W. | |
dc.contributor.author | Rosenthal, Yair | |
dc.contributor.author | Gruber, Nicolas | |
dc.contributor.author | Donner, Barbara | |
dc.contributor.author | Fischer, Gerhard | |
dc.date.accessioned | 2018-12-10T09:37:30Z | |
dc.date.available | 2018-12-10T09:37:30Z | |
dc.date.issued | 2018-01-15 | |
dc.identifier | 251808404 | |
dc.identifier | d32e6531-a0a9-4861-9eba-9ef369ad965b | |
dc.identifier | 85037366448 | |
dc.identifier | 000423892400057 | |
dc.identifier.citation | Gray , W R , Weldeab , S , Lea , D W , Rosenthal , Y , Gruber , N , Donner , B & Fischer , G 2018 , ' The effects of temperature, salinity, and the carbonate system on Mg/Ca in Globigerinoides ruber (white) : a global sediment trap calibration ' , Earth and Planetary Science Letters , vol. 482 , pp. 607-620 . https://doi.org/10.1016/j.epsl.2017.11.026 | en |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://hdl.handle.net/10023/16652 | |
dc.description | This research was funded by NSF grant NSF-OCE 1260696 awarded to S. Weldeab and D.W. Lea. | en |
dc.description.abstract | The Mg/Ca of planktic foraminifera Globigerinoides ruber (white) is a widely applied proxy for tropical and sub-tropical sea-surface temperature. The accuracy with which temperature can be reconstructed depends on how accurately relationships between Mg/Ca and temperature and the multiple secondary controls on Mg/Ca are known; however, these relationships remain poorly quantified under oceanic conditions. Here, we present new calibrations based on 440 sediment trap/plankton tow samples from the Atlantic, Pacific and Indian Oceans, including 130 new samples from the Bay of Bengal/Arabian Sea and the tropical Atlantic Ocean. Our results indicate temperature, salinity and the carbonate system all significantly influence Mg/Ca in G. ruber (white). We propose two calibration models: The first model assumes pH is the controlling carbonate system parameter. In this model, Mg/Ca has a temperature sensitivity of 6.0±0.8%/°C (2σ), a salinity sensitivity of 3.3±2.2%/PSU and a pH sensitivity of −8.3±7.7%/0.1 pH units; The second model assumes carbonate ion concentration ([CO32−]) is the controlling carbonate system parameter. In this model, Mg/Ca has a temperature sensitivity of 6.7±0.8%/°C, a salinity sensitivity of 5.0±3.0%/PSU and a [CO32−] sensitivity of −0.24±0.11%/μmol kg−1. In both models, the temperature sensitivity is significantly lower than the widely-applied sensitivity of 9.0±0.6%/°C. Application of our new calibrations to down-core data from the Last Glacial Maximum, considering whole ocean changes in salinity and carbonate chemistry, indicate a cooling of 2.4±1.6°C in the tropical oceans if pH is the controlling parameter and 1.5±1.4°C if [CO32−] is the controlling parameter. | |
dc.format.extent | 14 | |
dc.format.extent | 5440618 | |
dc.language.iso | eng | |
dc.relation.ispartof | Earth and Planetary Science Letters | en |
dc.subject | Carbonate chemistry | en |
dc.subject | Mg/Ca | en |
dc.subject | Planktic foraminifera | en |
dc.subject | Salinity | en |
dc.subject | SST | en |
dc.subject | GE Environmental Sciences | en |
dc.subject | QD Chemistry | en |
dc.subject | QC Physics | en |
dc.subject | Geophysics | en |
dc.subject | Geochemistry and Petrology | en |
dc.subject | Earth and Planetary Sciences (miscellaneous) | en |
dc.subject | Space and Planetary Science | en |
dc.subject | DAS | en |
dc.subject.lcc | GE | en |
dc.subject.lcc | QD | en |
dc.subject.lcc | QC | en |
dc.title | The effects of temperature, salinity, and the carbonate system on Mg/Ca in Globigerinoides ruber (white) : a global sediment trap calibration | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. School of Earth & Environmental Sciences | en |
dc.identifier.doi | 10.1016/j.epsl.2017.11.026 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2018-12-08 | |
dc.identifier.url | http://www.sciencedirect.com/science/article/pii/S0012821X17306623#appd002 | en |
This item appears in the following Collection(s)
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.