Mg-Ca Temperature Proxy Presentation (1)

Mg-Ca Temperature Proxy Presentation (1) - It is fair to...

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Unformatted text preview: It is fair to say that this new paleothermometry approach, perhaps more than any other, is revolutionizing the means by which paleoceanographers and paleoclimatologists unravel ocean and climate history. D.W. Lea TEMPERATURE PROXY Small foraminifera in the ocean build their shells out of calcite and depending on the temperature, they substitute more or less Mg from seawater into their shells. (Ca, Mg)CO 3 Mg is more abundant in seawater than Ca throughout the water column. Higher temperatures make it easier to incorporate Mg2+ in Calcite. (Substitution is endothermic) water temperatures = faster shell building = Mg in foram shell Mg and Ca have a similar ionic radius and charge so the forams cant tell the difference. Mg/Ca is measured on the same biotic carrier as 18 O (forams), which allows us to reconstruct 18 O water and salinity variations.  In effect, paleotemperatures and ice volume can be determined with the same foram at the same time  Planktonic forams live in the well mixed zone so their Mg/Ca ratio...
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Mg-Ca Temperature Proxy Presentation (1) - It is fair to...

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