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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, D18105, doi:10.1029/2007JD008652, 2007

Spatial covariance of water isotope records in a global network of ice cores spanning twentieth-century climate change

David P. Schneider

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA


David C. Noone

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA


Abstract

Estimating the spatial extent of past climate changes has been an ongoing challenge for paleoclimatology. For such estimates to be made with confidence, it is important to establish an understanding of the spatial coherence of proxy records during an interval of known climate change. We use water stable isotopes from high-resolution ice cores and twentieth-century observations of sea level pressures and sea surface temperatures to assess the covariance among isotopic records and its link to organized patterns of climate variability. Covarying signals in the cores are identified using empirical orthogonal function analysis. Results from regression analysis show that the leading signals are consistent with key climate patterns including the Northern Atlantic Oscillation and Southern Annular Mode and variability in tropical Pacific sea surface temperatures associated with the El Niño–Southern Oscillation. Patterns that have recently been identified in instrumental data, such as positive tropical Pacific SST anomalies associated with the negative phase of the SAM, are evident in the ice cores. These explanations for the variance of stable isotopes are consistent with recent studies using isotope-enabled general circulation models and provide a physical basis for interpreting the observed isotopic signals. While there is also a global change signal that is evident when analyzing the records collectively, there are some limitations in reconstructing global temperatures due to the geographic coverage of the available records and the current lack of modeling studies to explain the observed global-scale changes. Still, water stable isotope ratios preserved in ice cores provide a sufficiently rich sampling of large-scale climate variability that they can be more widely used in physically based paleoclimate reconstructions covering the last millennium and other periods.

Received 12 March 2007; accepted 27 June 2007; published 20 September 2007.

Keywords: ice cores; paleoclimate; climate change.

Index Terms: 0724 Cryosphere: Ice cores (4932); 0429 Biogeosciences: Climate dynamics (1620); 1616 Global Change: Climate variability (1635, 3305, 3309, 4215, 4513); 3344 Atmospheric Processes: Paleoclimatology (0473, 4900).

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Citation: Schneider, D. P., and D. C. Noone (2007), Spatial covariance of water isotope records in a global network of ice cores spanning twentieth-century climate change, J. Geophys. Res., 112, D18105, doi:10.1029/2007JD008652.