TITLE

Impact of postglacial warming on borehole reconstructions of last millennium temperatures

AUTHOR(S)
Rath, V.; Rouco, J. F. González; Goosse, H.
PUB. DATE
September 2011
SOURCE
Climate of the Past Discussions;2011, Vol. 7 Issue 5, p3325
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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.
ACCESSION #
70491816

 

Related Articles

  • Ocean circulation in a warming climate. Toggweiler, J. R.; Russell, Joellen // Nature;1/17/2008, p286 

    The article focuses on the research on ocean circulation in a warming climate. Accordingly, findings show that the Last Glacial Maximum (LGM) had stronger winds which fit to the common observation that it is windier in the winter than in the summer because there is greater thermal contrast...

  • How cold was Europe at the Last Glacial Maximum? A synthesis of the progress achieved since the first PMIP model-data comparison. Ramstein, G.; Kageyama, M.; Guiot, J.; Wu, H.; Hély, C.; Krinner, G.; Brewer, S. // Climate of the Past Discussions;2007, Vol. 3 Issue 1, p197 

    The Last Glacial Maximum has been one of the first foci of the Paleoclimate Modelling Intercomparison Project (PMIP). During its first phase, the results of 17 atmosphere general circulation models were compared to paleoclimate reconstructions. One of the largest discrepancies in the simulations...

  • The great climate flip-flop. Calvin, William H. // Atlantic;Jan1998, Vol. 281 Issue 1, p47 

    The article discusses the potential for global climate change. The earth's temperature undergoes rapid flips throughout the millennia; a change from the current temperature to that of an ice age could occur in as little as a decade and could be precipitated by global warming. The article...

  • How cold was the Little Ice Age? A proxy-based reconstruction from Finland applying modern analogues of fossil midge assemblages. Luoto, Tomi // Environmental Earth Sciences;Mar2013, Vol. 68 Issue 5, p1321 

    Climate dynamics during the past ca. 700 years in southern Finland were reconstructed using fossil midge (Diptera:Nematocera) assemblages aiming to estimate quantitatively the temperature change that has occurred from the Little Ice Age to the present. Midge stratigraphies of two sediment cores...

  • Small mammal diversity loss in response to late-Pleistocene climatic change. Blois, Jessica L.; McGuire, Jenny L.; Hadly, Elizabeth A. // Nature;6/10/2010, Vol. 465 Issue 7299, p771 

    Communities have been shaped in numerous ways by past climatic change; this process continues today. At the end of the Pleistocene epoch about 11,700 years ago, North American communities were substantially altered by the interplay of two events. The climate shifted from the cold, arid Last...

  • Use of the HVSR method to detect buried paleomorphologies (filled incised-valleys) below a coastal plain: the case of the Metaponto plain (Basilicata, southern Italy). Grippa, A.; Bianca, M.; Tropeano, M.; Cilumbriello, A.; Gallipoli, M. R.; Mucciarelli, M.; Sabato, L. // Bollettino di Geofisica Teorica ed Applicata;Jun2011, Vol. 52 Issue 2, p225 

    A non-invasive and low-cost geophysical method for the H/V spectral ratio (HVSR) of microtremors was employed for the first time in the Metaponto coastal plain (Basilicata region, southern Italy) in order to draw 3D unconformities within the subsurface. Through the stratigraphical analysis of...

  • Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison. Pausata, F. S. R.; Li, C.; Wettstein, J. J.; Nisancioglu, K. H.; Battisti, D. S. // Climate of the Past;2009, Vol. 5 Issue 3, p489 

    Using four different climate models, we investigate sea level pressure variability in the extratropical North Atlantic in the preindustrial climate (1750 AD) and at the Last Glacial Maximum (LGM, 21 kyrs before present) in order to understand how changes in atmospheric circulation can affect...

  • Possible role of dust-induced regional warming in abrupt climate change during the last glacial... Overpeck, Jonathan; Rind, David // Nature;12/5/1996, Vol. 384 Issue 6608, p447 

    Suggests that high glacial dust loading may have caused significant, episodic regional warming downwind of major Asian and ice-margin dust sources during the last glacial period. The association of abrupt changes in dust loading with the Dansgaard-Oeschger and Heinrich climate events and with...

  • The new ice age. Lemley, Brad // Discover;Sep2002, Vol. 23 Issue 9, p34 

    Focuses on the return of the ice age era. Predictions made by the Woods Hole Oceanographic Institution; Decrease of average temperatures of five degrees Fahrenheit; Effects of ice age in the climate of an area. INSETS: COLD BRUTALITY;BLOWING HOT AND COLD.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics