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A coupled calibration and modelling approach to the understanding of dry-land lake oxygen isotope records

Jones, Matthew D.; Leng, Melanie J.; Roberts, C. Neil; Turkes, Murat; Moyeed, Rana

A coupled calibration and modelling approach to the understanding of dry-land lake oxygen isotope records Thumbnail


Authors

MATTHEW JONES MATTHEW.JONES@NOTTINGHAM.AC.UK
Professor of Quaternary Science

C. Neil Roberts

Murat Turkes

Rana Moyeed



Abstract

Comparisons between climate proxies and instrumental records through the last two centuries are often used to understand better the controls on palaeoarchives and to find relationships that can be used to quantify changes in pre-instrumental climate. Here we compare an 80-year-long annually resolved oxygen isotope record from Nar Gölü, Turkey, a varved lake sequence, with instrumental records of temperature, precipitation, wind speed, relative humidity and calculated values of evaporation, all of which are known to be possible controls on lake oxygen isotope systems. Significant relationships are found between the isotope record and summer temperatures and evaporation suggesting these are dominant controls on the isotope hydrology of this non-outlet lake. Modelling the stable isotope hydrology of the lake system allows these relationships to be tested independently. We show that the isotope record follows the same trends in the temperature and evaporation records but that, even when combined, these two climatic factors cannot fully explain the magnitude of change observed in the isotope record. The models show the lake system is much less sensitive to changes in evaporation and temperature than the climate calibration suggests. Additional factors, including changes in the amount of precipitation, are required to amplify the isotope change. It is concluded that proxy-climate calibrations may incorrectly estimate the amplitude of past changes in individual climate parameters, unless validated independently.

Journal Article Type Article
Acceptance Date Mar 31, 2005
Online Publication Date Oct 1, 2005
Publication Date Oct 1, 2005
Deposit Date Jun 29, 2015
Publicly Available Date Jun 29, 2015
Journal Journal of Paleolimnology
Print ISSN 0921-2728
Electronic ISSN 0921-2728
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 34
Issue 3
Pages 391–411
DOI https://doi.org/10.1007/s10933-005-6743-0
Keywords Oxygen Isotopes, Annual Resolution, Modelling, Calibration, Climate, Turkey
Public URL https://nottingham-repository.worktribe.com/output/1019890
Publisher URL http://link.springer.com/article/10.1007%2Fs10933-005-6743-0
Additional Information The final publication is available at Springer via http://dx.doi.org/10.1007/s10933-005-6743-0

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