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- W2079427331 abstract "[1] We present and discuss the record of O2/N2 ratios in air occluded in the GISP2 ice core retrieved from Summit, Greenland. In this study, we examine results for 601 samples from 331 depths measured by 1994, and 92 samples from 46 depths newly measured in 2006. Poorly replicated samples, samples with no replicates and samples falling more than three standard deviations from the mean of each δO2/N2 data set are excluded from the analysis. The majority of poorly replicated samples are from the depth zone associated with the transition between gas in bubbles and gas present as clathrate hydrates. We found that the O2/N2 ratio of samples is depleted by an average value of 7.3‰ during 11 years of storage at −35°C O2/N2 ratios measured at various times were corrected for depletion during storage and combined to form a single data set. The stacked GISP2 δO2/N2 record shows strong spectral power at the orbital frequencies, and δO2/N2 is in antiphase with local summer insolation. This observation is consistent with the earlier findings for the Vostok and Dome Fuji ice cores from East Antarctica. It validates previous conclusions that fractionation during bubble close-off depends on ice grain properties set at the surface by solar insolation. In addition, the GISP2 δO2/N2 record shows millennial duration signals that are in phase with the local temperature record of rapid climate change. The exact mechanisms by which local summer insolation induces orbital variability in δO2/N2, and by which temperature (or related properties) induce high frequency signals in δO2/N2, remain to be identified." @default.
- W2079427331 created "2016-06-24" @default.
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- W2079427331 date "2008-06-14" @default.
- W2079427331 modified "2023-09-24" @default.
- W2079427331 title "O<sub>2</sub>/N<sub>2</sub>ratios of occluded air in the GISP2 ice core" @default.
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- W2079427331 doi "https://doi.org/10.1029/2007jd009589" @default.
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