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.

DOI: https://doi.org/10.1016/j.gloplacha.2009.08.004

Abstract

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.

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About

• Item ORO ID
• 18381
• Item Type
• Journal Item
• ISSN
• 0921-8181
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	School of Geography, Earth & Environmental Sciences, University of Birmingham
  Isotope Geosciences Laboratory	IP/877/2005	NERC (Natural Environment Research Council)
  Not Set	Not Set	British Institute of Archaeology at Ankara
  Environmental Change North East Turkey	Not Set	ENVNET

• Keywords
• speleothem; climate calibration; stable isotopes; Turkey
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2010 Elsevier B.V.
• Depositing User
• Colin Smith