Hello, my name is David Bajnai (pronounce it as Dah-ved Bhay-na-e). I am a research associate in geochemistry at the University of Cologne.
My scientific goals are to reconstruct accurate and precise seawater temperatures in geological times to learn about past (and future) climates. In my research, I focus on the stable isotope fractionations that happen during biomineralisation. The stable isotope composition of the fossil remains of marine calcifiers, eg belemnites and brachiopods, holds information on the surrounding water temperatures. By measuring this, palaeoceanographers can postulate how warm the oceans were millions of years ago. However, isotope fractionations, so-called vital effects, bias these temperature estimates. I am using the clumped isotope (∆47 and ∆48) and the triple oxygen isotope (δ17O) proxies to map these vital effects, correct for them, and thus determine unbiased, accurate temperature reconstructions.
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