Definition
Mg/Ca paleothermometry. Geochemical proxy used in paleoceanography to reconstruct past temperatures of the ocean surface.
Reliable sea surface temperature (SST) estimates are crucial to the reconstruction and modeling of past climate change. Reconstructions of the thermal state of the ocean, in turn, may help to assess the significance of instrumentally observed climate variability and may validate global circulation models used to predict future climate change. Most promising in this respect is the Mg/Ca paleothermometry, which is based on the temperature dependence of the substitution of magnesium into biogenic calcite. It has long been known that tropical calcitic shells of marine organisms are generally more enriched in magnesium than subpolar shells (e.g., Savin and Douglas, 1973). But in particular for the important group of foraminifera (marine protozoa), a well-defined and species-specific calibration of the shell Mg/Ca ratio on ocean temperature was missing until...
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Bibliography
Anand, P., Elderfield, H., and Comte, M. H., 2003. Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series. Paleoceanography, 18, PA1050, doi:10.1029/2002PA000846.
Brown, S. J., and Elderfield, H., 1996. Variations in Mg/Ca and Sr/Ca ratios of planktonic foraminifera caused by postdepositional dissolution: evidence of shallow Mg-dependent dissolution. Paleoceanography, 11(5), 543–551.
Dekens, P. S., Lea, D. W., Pak, D. K., and Spero, H. J., 2002. Core top calibration of Mg/Ca in tropical foraminifera: refining paleotemperature estimation. Geochemistry, Geophysics, Geosystems, 3, 1–29, doi:10.1029/2001GC00.
Elderfield, H., and Ganssen, G., 2000. Past temperature and δ18O of surface ocean waters inferred from foraminiferal Mg/Ca ratios. Nature, 405, 442–445.
Greaves, M., Caillon, N., Rebaubier, H., Bartoli, G., Bohaty, S., Cacho, I., Clarke, L., Cooper, M., Daunt, C., Delaney, M., deMenocal, P., Dutton, A., Eggins, S., Elderfield, H., Garbe-Schönberg, C. D., Goddard, E., Green, D., Groeneveld, J., Hastings, D., Hathorne, E., Kimoto, N., Klinkhammer, G., Labeyrie, L., Lea, D. W., Marchitto, T., Martínez-Botí, M. A., Mortyn, P. G., Ni, Y., Nürnberg, D., Paradis, G., Pena, L., Quinn, T., Rosenthal, Y., Russell, A., Sagawa, T., Sosdian, S., Stott, L., Tachikawa, K., Tappa, E., Thunell, R., and Wilson, P. A., 2008. Interlaboratory comparison study of calibration standards for foraminiferal Mg/Ca thermometry. Geochemistry, Geophysics, Geosystems, 9(8), 1–27, doi:10.1029/2008GC001974.
Kisakürek, B., Eisenhauer, A., Böhm, F., Garbe-Schönberg, D., and Erez, J., 2008. Controls on shell Mg/Ca and Sr/Ca in cultured planktonic foraminiferan, Globigerinoides ruber (white). Earth and Planetary Science Letters, 273, 260–269, doi:10.1016/j.epsl.2008.06.026.
Lea, D. W., Pak, D. K., and Spero, H. W., 2000. Climate impact of later Quaternary equatorial Pacific sea surface temperature variations. Science, 289, 1719–1724.
Nürnberg, D., 1995. Magnesium in tests of Neogloboquadrina pachyderma sinistral from high northern and southern latitudes. Journal of Foraminiferal Research, 25, 350–368.
Nürnberg, D., 2000. Taking the temperature of past ocean surfaces. Science, 289, 1698–1699.
Nürnberg, D., Bijma, J., and Hemleben, C., 1996. Assessing the reliability of magnesium in foraminiferal calcite as a proxy for water mass temperatures. Geochimica et Cosmochimica Acta, 60, 803–814.
Regenberg, M., Nürnberg, D., Steph, S., Groeneveld, J., Garbe-Schönberg, D., Tiedemann, R., and Dullo, W. C., 2006. Assessing the effect of dissolution on planktonic foraminiferal Mg/Ca ratios: evidence from Caribbean core tops. Geochemistry, Geophysics, Geosystems, 7, 1–23, doi:10.1029/2005GC001019002E.
Regenberg, M., Steph, S., Nürnberg, D., Tiedemann, R., and Garbe-Schönberg, D., 2009. Calibrating Mg/Ca ratios of multiple planktonic foraminiferal species with δ18O-calcification temperatures: paleothermometry for the upper water column. Earth and Planetary Science Letters, 278, 324–336, doi:10.1016/j.epsl.2008.12.019.
Rosenthal, Y., Lohmann, G. P., Lohmann, K. C., and Sherrell, R. M., 2000. Incorporation and preservation of Mg in Globigerinoides sacculifer: implications for reconstructing the temperature and 18O/16O of seawater. Paleoceanography, 15, 135–145.
Savin, S. M., and Douglas, R. G., 1973. Stable isotope and magnesium geochemistry of recent planktonic foraminifera from the South Pacific. Geological Society of America Bulletin, 84, 2327–2342.
Tyrrell, T., and Zeebe, R. E., 2004. History of carbonate ion concentration over the last 100 million years. Geochimica et Cosmochimica Acta, 68(17), 3521–3530.
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Nürnberg, D. (2015). Mg/Ca Paleothermometry. In: Harff, J., Meschede, M., Petersen, S., Thiede, J. (eds) Encyclopedia of Marine Geosciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6644-0_98-2
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DOI: https://doi.org/10.1007/978-94-007-6644-0_98-2
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Mg/Ca Paleothermometry- Published:
- 12 February 2015
DOI: https://doi.org/10.1007/978-94-007-6644-0_98-2
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Original
Mg/Ca Paleothermometry- Published:
- 12 February 2014
DOI: https://doi.org/10.1007/978-94-007-6644-0_98-1