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The University of Tennessee Department of Geography has a strong program of research involving the reconstruction of past environmental conditions—climate, vegetation, fire, ecosystem disturbances, and human activity—from natural archives that include tree rings, soils, and lake sediments.Three faculty members (Sally Horn, Henri Grissino-Mayer, and Yingkui Li) and their students are active in paleoclimate and paleoenvironmental research funded by the National Science Foundation and a variety of other agencies.

Holocene and last ice age) t 0 marked by separation from cosmogenic reservoir (e.g., when dying) It is carbon A probe of the global carbon cycle Environmental molecular forensics ( natural or fossil? oxalic acid (Ox I and Ox II) Reporting: Need to correct for/normalize for isotope fractionation, so use δ 13 C measurement to correct to a standard fractionation of δ 13 C = 25, so we have /1000 FM FM This isn t quite right** Corr 13 1 C /1000 And you most often see radiocarbon reported as an anomaly scale in *more later 14 t 1950 C F c M e Corr Looks like, but isn t an isotope ratio anomaly! R., Radiocarbon 53, The Seuss effect Past Changes and Calibration Curves We need a conversion method because of the screwed up reporting convention (the Libby half life) Evidence from 10 Be, 26 Al, 36 Cl, etc.

The purpose of this one-day workshop is to communicate details of these advances in order to improve field plans, sampling strategies, laboratory techniques, and date interpretation.

We anticipate that the workshop will promote improved future studies, a better understanding of the uncertainties in the new dates, and further innovations in geochronology.

Secondly, organic carbon trapped under the ice can be metabolized by microbes to form methane, a potent greenhouse gas.

Calculations suggest up to 21,000 petagrams of organic carbon (10 times the permafrost carbon stock) might be trapped under Antarctica’s ice and that microbial conversion of this carbon to methane could be a major feedback in climate change Subglacial ecosystems: life between a rock and a hard place. Birgit Sattler sampling under Gaisbergferner in the Austrian Alps. Photo credit: Dr Tristram Irvine-Fynn Glacier ecosystems: Life inside the bergschrund of an Alpine glacier is dark, cold and very little organic matter to consume.

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