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| Titel |
Impact of postglacial warming on borehole reconstructions of last millennium temperatures |
| VerfasserIn |
V. Rath, J. F. González Rouco, H. Goosse |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 3 ; Nr. 8, no. 3 (2012-06-19), S.1059-1066 |
| Datensatznummer |
250005595
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| Publikation (Nr.) |
 copernicus.org/cp-8-1059-2012.pdf |
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| Zusammenfassung |
| The investigation of observed borehole temperatures has proved to be a valuable tool for the
reconstruction of ground surface temperature histories. However, there are still many open questions
concerning the significance and accuracy of the reconstructions from these data. In particular, the
temperature signal of the warming after the Last Glacial Maximum is still present in borehole
temperature profiles. It is shown here that this signal also influences the relatively shallow
boreholes used in current paleoclimate inversions to estimate temperature changes in the last
centuries by producing errors in the determination of the steady state geothermal gradient. However,
the impact on estimates of past temperature changes is weaker. For deeper boreholes, the curvature
of the long-term signal is significant. A correction based on simple assumptions about
glacial–interglacial temperature changes shows promising results, improving the extraction of
millennial scale signals. The same procedure may help when comparing observed borehole temperature
profiles with the results from numerical climate models. |
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