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This data is from the National Oceanic and Atmospheric Administration/Climate Monitoring and Diagnostics Laboratory air sampling network (available at www.cmdl.noaa.gov/ftpdata.html).
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2O measurements the refreezing temperature was held at -25°C
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2O measurements the refreezing temperature was held at -25°C.
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12
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0344365369
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note
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2O (at standard temperature and pressure), corresponding to a concentration correction of about 6 ppbv with a typical sample size of 40 g of ice.
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13
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0345660037
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note
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The enrichment due to gravitational fractionation is 1.5 ppbv for the GRIP samples from the past millennium and 1.7 to 2.3 ppbv for the other GRIP samples. The Byrd samples have to be corrected by 1.0 to 1.1 ppbv. The results presented here have not been corrected.
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14
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0023516571
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The 1σ band is given by the mean and the standard deviation of all splines
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For the Monte Carlo simulation, 1000 runs were simulated. Each run takes into account the fact that the deviations from the mean values show a Gaussian distribution and calculates a smoothed spline with a cutoff period of 300 years [I. G. Enting, J. Geophys. Res. 92, 10977 (1987)]. The 1σ band is given by the mean and the standard deviation of all splines.
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Johnsen, S.J.1
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29
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0345660032
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note
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This work, as part of CRIP, was supported by the University of Bern, the Swiss National Science Foundation, the European Community program "Environment and Climate 1994-1998," the Fondation de France, and the Programme National d'Étude de la Dynamique de Climat Special thanks to J. Schwander, F. Joos, and R. Knutti for fruitful conversations and to E. Wolff and two anonymous reviewers for constructive comments.
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