Gray, William Robert; Weldeab, Syee; Lea, David W; Rosenthal, Yair; Gruber, Nicolas; Donner, Barbara; Fischer, Gerhard (2018): A global sediment trap database of Mg/Ca in planktic foraminifera Globigerinoides ruber [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.885877, Supplement to: Gray, WR et al. (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, 482, 607-620, https://doi.org/10.1016/j.epsl.2017.11.026
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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 (2 Sigma), 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 ([CO3**2-]) 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 [CO3**2-] 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 [CO3**2-] is the controlling parameter.
Related to:
Anand, Pallavi; Elderfield, Henry; Conte, Maureen H (2003): Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography, 18(2), 1050, https://doi.org/10.1029/2002PA000846
Babila, Tali L; Rosenthal, Yair; Conte, Maureen H (2014): Evaluation of the biogeochemical controls on B/Ca of Globigerinoides ruber white from the Oceanic Flux Program, Bermuda. Earth and Planetary Science Letters, 404, 67-76, https://doi.org/10.1016/j.epsl.2014.05.053
Fallet, Ulrike; Brummer, Geert-Jan A; Zinke, Jens; Vogels, Sanne; Ridderinkhof, Herman (2010): Contrasting seasonal fluxes of planktonic foraminifera and impacts on paleothermometry in the Mozambique Channel upstream of the Agulhas Current. Paleoceanography, 25(4), https://doi.org/10.1029/2010PA001942
Fischer, Gerhard; Romero, Oscar E; Merkel, Ute; Donner, Barbara; Iversen, Morten Hvitfeldt; Nowald, Nicolas; Ratmeyer, Volker; Ruhland, Götz; Klann, Marco; Wefer, Gerold (2016): Deep ocean mass fluxes in the coastal upwelling off Mauritania from 1988 to 2012: variability on seasonal to decadal timescales. Biogeosciences, 13(10), 3071-3090, https://doi.org/10.5194/bg-13-3071-2016
Friedrich, Oliver; Schiebel, Ralf; Wilson, Paul A; Weldeab, Syee; Beer, Christopher J; Cooper, Matthew J; Fiebig, Jens (2012): Influence of test size, water depth, and ecology on Mg/Ca, Sr/Ca, ?18O and ?13C in nine modern species of planktic foraminifers. Earth and Planetary Science Letters, 319-320, 133-145, https://doi.org/10.1016/j.epsl.2011.12.002
Haarmann, Tim; Hathorne, Ed C; Mohtadi, Mahyar; Groeneveld, Jeroen; Kölling, Martin; Bickert, Torsten (2011): Mg/Ca ratios of single planktonic foraminifer shells and the potential to reconstruct the thermal seasonality of the water column. Paleoceanography, 26, PA3218, https://doi.org/10.1029/2010PA002091
Huang, Kuo-Fang; You, Cheng-Feng; Lin, Hui-Ling; Ying-Tzeng, Shieh (2008): In situ calibration of Mg/Ca ratio in planktonic foraminiferal shell using time series sediment trap: A case study of intense dissolution artifact in the South China Sea. Geochemistry, Geophysics, Geosystems, 9(4), https://doi.org/10.1029/2007GC001660
Mathien-Blard, Elise; Bassinot, Franck C (2009): Salinity bias on the foraminifera Mg/Ca thermometry: Correction procedure and implications for past ocean hydrographic reconstructions. Geochemistry, Geophysics, Geosystems, 10(12), https://doi.org/10.1029/2008GC002353
McConnell, Martha C; Thunell, Robert C (2005): Calibration of the planktonic foraminiferal Mg/Ca paleothermometer: Sediment trap results from the Guaymas Basin, Gulf of California. Paleoceanography, 20(2), https://doi.org/10.1029/2004PA001077
Mohtadi, Mahyar; Steinke, Stephan; Groeneveld, Jeroen; Fink, Hiske G; Rixen, Tim; Hebbeln, Dierk; Donner, Barbara; Herunadi, Bambang (2009): Low-latitude control on seasonal and interannual changes in planktonic foraminiferal flux and shell geochemistry off south Java: A sediment trap study. Paleoceanography, 24, PA1201, https://doi.org/10.1029/2008PA001636
Further details:
Anand, Pallavi; Elderfield, Henry; Conte, Maureen H (2003): Mg/Ca and δ¹⁸O measurements of planktonic foraminifera from Sargasso Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.740070
Haarmann, Tim; Hathorne, Ed C; Mohtadi, Mahyar; Groeneveld, Jeroen; Kölling, Martin; Bickert, Torsten (2011): Single planktonic foraminiferal Mg/Ca ratios of samples from sediment trap CBi3 upper off Cape Blanc (NW-Africa). PANGAEA, https://doi.org/10.1594/PANGAEA.762154
Mohtadi, Mahyar (2010): Planktonic foraminiferal flux and shell geochemistry data in the sediment trap time series JAM 1-3 off south Java. PANGAEA, https://doi.org/10.1594/PANGAEA.733785
Coverage:
Median Latitude: 14.332946 * Median Longitude: 61.695345 * South-bound Latitude: -16.200000 * West-bound Longitude: -111.670000 * North-bound Latitude: 36.120000 * East-bound Longitude: 141.890000
Date/Time Start: 1995-03-14T18:22:00 * Date/Time End: 2006-09-28T00:00:00
Minimum Elevation: -4160.0 m * Maximum Elevation: 0.0 m
Event(s):
CB_trap * Latitude: 21.633000 * Longitude: -20.183300 * Elevation: -4160.0 m * Location: off Cap Blanc * Method/Device: Trap (TRAP)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Gray, William Robert | |||
| 2 | Latitude of event | Latitude | Gray, William Robert | |||
| 3 | Longitude of event | Longitude | Gray, William Robert | |||
| 4 | Reference/source | Reference | Gray, William Robert | trap ref | ||
| 5 | Location | Location | Gray, William Robert | |||
| 6 | Sample ID | Sample ID | Gray, William Robert | |||
| 7 | Day of study | DOS | day | Gray, William Robert | open | |
| 8 | Day of study | DOS | day | Gray, William Robert | close | |
| 9 | Globigerinoides ruber white, Magnesium/Calcium ratio | G. ruber w Mg/Ca | mmol/mol | Gray, William Robert | ||
| 10 | Morphotype | Morphotype | Gray, William Robert | |||
| 11 | Size fraction | Size fraction | Gray, William Robert | size min | ||
| 12 | Size fraction | Size fraction | Gray, William Robert | size max | ||
| 13 | Temperature, water | Temp | °C | Gray, William Robert | ||
| 14 | Sigma | Sigma | Gray, William Robert | of T | ||
| 15 | Salinity | Sal | Gray, William Robert | |||
| 16 | Sigma | Sigma | Gray, William Robert | of S | ||
| 17 | pH | pH | Gray, William Robert | |||
| 18 | Sigma | Sigma | Gray, William Robert | of pH | ||
| 19 | Carbonate ion | [CO3]2- | µmol/kg | Gray, William Robert | ||
| 20 | Sigma | Sigma | Gray, William Robert | of CO3 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7480 data points
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