The Open UniversitySkip to content

Calibration of Speleothem ?18O with instrumental climate records from Turkey

Jex, N. Catherine; Baker, Andy; Fairchild, Ian J.; Eastwood, Warren J.; Leng, Melanie J.; Sloane, Hilary J.; Thomas, Louise and Bekaro?lu, Erdem (2010). Calibration of Speleothem ?18O with instrumental climate records from Turkey. Global and Planetary Change, 71(3-4) pp. 207–217.

Full text available as:
PDF (Accepted Manuscript) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (556kB)
DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


Stalagmite records of oxygen (?18O) isotopes, sampled at sub-annual resolution by micro-mill techniques are correlated with climate parameters over the instrumental period (1961 to 2005 AD). The strongest correlations were found between ?18O and total amount of late autumn-winter precipitation (October to January) smoothed by 6 years, with marginally weaker correlations between the total amount of late autumn-spring precipitation (ONDJF and ONDJFMA) smoothed over the same time period. Two smoothing options were chosen to account for variability in mixing and residence times of stored water in the karst aquifer prior to entering the cave: 1) An average of the last 6 years of precipitation which yielded a product correlation of ? 0.71 for the months ONDJ; and 2) a mixing model of 10% short term/event water (< 1 year) and 90% water of a longer residence time in the karst aquifer (2 to 6 years) which gave a product correlation of ? 0.72 for the months ONDJ. Precipitation is calibrated over the instrumental period (1961 to 2004 AD) based on linear regression of ?18O with observed precipitation for the months ONDJ, ONDJF and ONDJFMA using both smoothing methods. An uncertainty of ± 31 mm (2 standard errors on the linear regression) is applied to the calibrations. This is the first speleothem calibration of its kind in Turkey.

Item Type: Journal Item
Copyright Holders: 2010 Elsevier B.V.
ISSN: 0921-8181
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetSchool of Geography, Earth & Environmental Sciences, University of Birmingham
Isotope Geosciences LaboratoryIP/877/2005NERC (Natural Environment Research Council)
Not SetNot SetBritish Institute of Archaeology at Ankara
Environmental Change North East TurkeyNot SetENVNET
Keywords: speleothem; climate calibration; stable isotopes; Turkey
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 18381
Depositing User: Colin Smith
Date Deposited: 08 Sep 2009 15:30
Last Modified: 09 Dec 2018 18:25
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Download history for this item

These details should be considered as only a guide to the number of downloads performed manually. Algorithmic methods have been applied in an attempt to remove automated downloads from the displayed statistics but no guarantee can be made as to the accuracy of the figures.

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU