The analysis evaluated the potential impacts on early human habitation during 14,000 years of temperature variations from the deglacial to the Holocene.
"We have to look to the past to try to better constrain how these areas have responded previously," said Kielhofer. "And how they might respond in the future under climate scenarios that we predict."Previous studies have used changes in flora and pollen to create rough temperature records. These data, however, can only give a broad impression of whether a place has been warming or cooling over time.
Kielhofer analyzed soil samples from the archeological sites to get a more exact history of temperatures. She studied temperature data preserved in bacteria using a method called brGDGT paleothermometry to establish a record of the mean yearly air temperature above freezing with a precision of roughly 2.8 degrees Celsius."Bacteria are everywhere," she said.
Kielhofer and the team focusing on other historical documents, such as shifts in aridity, can clarify how the environment in this area affected early human groups.Aeolian deposits in the middle Tanana Valley of central Alaska offer a well-preserved record of paleoenvironmental change since the deglacial period .
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