Researcher Carolyn Snyder goes to prove the climatic changes of the Earth extending global temperatures back to almost two million years.
As part of her doctoral dissertation at Stanford University, Carolyn Snyder went around the world to create a reconstruction. A reconstruction comprising of sea surface temperature proxies from across the globe, such as ratios between magnesium and calcium, species makeup and acidity ranging over million years ago through collection of a set of proxy data taken from a geographically diverse set of locations.
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She took data from 59 different ocean sediment cores, which were used to calculate 20,000 individual ocean temperature data points. Her tremendous amount of data gives her one reading per century over two million years.
The temporal resolution of the reconstruction is only about 1,000 years which can pick out the glacial cycles. On the contrary to the 40,000 years circle, Snyder calculated the data to accommodate the mid-Pleistocene transition which is when the climate underwent a transition.
Earlier, it was going through glacial cycles every 40,000 years, but it shifted to taking 100,000 years to cycle. According to Snyder’s calculations, the climate was colder for the first million years and then the cooling trend began to slow down.
It eventually flattened out and the overall global average temperature remained stable through to the present, even as glacial cycles caused lots of fluctuations around that average, according to ArsTechnica.
Snyder has also predicted that the doubling of the temperature over time is a cause for concern for everyone. This theory of hers is already been challenged by many of the other researchers who admit that while her work is staggering and iconic in the world of climatic study, the duration and exemption of many variables from the estimation process make the forthcoming predictions somewhat questionable.
Snyder’s study has been published in the journal Nature. She is also now a climate policy official at the U.S. Environmental Protection Agency.