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| Titel |
The influence of varying Holocene boundary conditions on Greenland ice core δ¹⁸O, temperature, height and latitude relationships |
| VerfasserIn |
Peter L. Langen, Tim Brücher, Bo M. Vinther, Sigfus J. Johnsen, David Noone |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Datensatznummer |
250040860
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| Zusammenfassung |
| The stable water isotope composition in ice cores is routinely used to infer detailed
information about a host of climate variables such as regional temperatures, accumulation
rates and moisture sources. Recently, Vinther et al. (2009) were able to reconstruct Holocene
histories of Greenland ice sheet height assuming a constant slope of the δ18O relationship
with deposition altitude. Whether this slope has remained constant throughout the Holocene
is the object of this study. Sime et al. (2009) have found that the δ18O/temperature slope in
East Antarctica is likely to be smaller in warmer climates and we investigate whether similar
nonlinearities may be at play in Greenland.
We employ the NCAR CAM3 atmosphere general circulation model with an
implementation of stable water isotope processes which reproduces with reasonable fidelity
the present-day Greenland slopes between δ18O of precipitation and surface temperature,
altitude and latitude. By varying Greenland ice sheet topography and sea surface
temperatures we explore the dynamical influences that realistic Holocene changes in
boundary conditions can have on these slopes. |
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