23 research outputs found
Winner-loser effects overrule aggressiveness during the early stages of contests between pigs
Climatic and societal impacts of a “forgotten” cluster of volcanic eruptions in 1108-1110 CE
Pressor Effects of Calcium Infusion in the Absence and Presence of a Calcium Antagonist in Subjects with Normotension and Hypertension
Metamorphism of Polar Firn: Significance of Microstructure in Energy, Mass and Chemical Species Transfer
Tree rings and ice cores reveal C-14 calibration uncertainties during the Younger Dryas
The Younger Dryas interval during the Last Glacial Termination was an abrupt return to glacial-like conditions punctuating the transition to a warmer, interglacial climate. Despite recent advances in the layer counting of ice-core records of the termination, the timing and length of the Younger Dryas remain controversial. Also, a steep rise in the concentration of atmospheric radiocarbon at the onset of the interval, recorded primarily in the Cariaco Basin, has been difficult to reconcile with simulations of the Younger Dryas carbon cycle. Here we discuss a radiocarbon chronology from a tree-ring record covering the Late Glacial period that has not been absolutely dated. We correlate the chronology to ice-core timescales using the common cosmic production signal in tree-ring C-14 and ice-core Be-10 concentrations. The results of this correlation suggest that the Cariaco record may be biased by changes in the concentration of radiocarbon in the upper ocean during the early phase of the Younger Dryas climate reversal in the Cariaco basin. This bias in the marine record may also affect the accuracy of a widely used radiocarbon calibration curve over this interval. Our tree-ring-based radiocarbon record is easily reconciled with simulated production rates and carbon-cycle changes associated with reduced ocean ventilation during the Younger Dryas
Real exchange rate, stationarity, and economic fundamentals
PPP, Regime Switching, Real Interest Rate Differential, Real Output Differential, F31, C22, F41,