Radiocarbon dating calibration

BP using coral samples from our offshore coral reef core collections from Barbados (13.10°N; 59.32°W) in the western tropical Atlantic and Kiritimati Atoll (1.99°N, 157.78°W) in the central equatorial Pacific, and from the uplifted reefs of Araki Island (15.63°S; 166.93°E) in the western Pacific.

In addition, we have reanalyzed the radiocarbon and U age dates from our earlier radiocarbon calibration work using new pretreatment and analytical techniques and state-of-the-art instrumentation at higher precision; we report these new results in this WEB site and in Fairbanks et al., (2005).

Of practical importance to a wide range of scientific disciplines is the radiocarbon calibration, which is used for converting radiocarbon ages to calendar years; essential for measuring time and rates of change for numerous scientific fields.

To access our radiocarbon calibration program, click on the 'Radiocarbon Calibration Program' button above, or here.

We therefore replaced that part of Int Cal04 with a new, floating tree-ring curve composed of 1382 rings between 10,650 and 12,000 14C yr B. All previous attempts to use layered sediments for radiocarbon calibration purposes have not stood the test of time and the Cariaco basin calibration data used in Int Cal04 are apparently no exception (Bondevik et al., 2006). representing only 50% of the radiocarbon age dating range.

This permits anyone to revise calibrated ages as our calibration curve is periodically updated over the next three years.In order to ensure that there is not a proliferation of calibration curves using outdated versions of our calibration data, we only offer an on line version.We will update our calibration curve every year and publish the data within 12 months of the update.In a series of published papers and manuscripts soon to be published, we present our analytical techniques in detail (Mortlock et al., 2005; Chiu et al., 2005a) and the geochemical (Cao et al., 2005) and geophysical (Chiu et al., 2005b, 2005c) explanations for the departure of radiocarbon dates from the true calendar ages and compare our results to other radiocarbon calibration data.View the entire radiocarbon calibration curve here.

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