Calibrating climate-δ18O regression models for the interpretation of high-resolution speleothem δ18O time series

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dc.contributor.authorFischer, MJen_AU
dc.contributor.authorTreble, PCen_AU
dc.date.accessioned2009-06-11T06:37:24Zen_AU
dc.date.accessioned2010-04-30T05:01:33Zen_AU
dc.date.available2009-06-11T06:37:24Zen_AU
dc.date.available2010-04-30T05:01:33Zen_AU
dc.date.issued2008-09-03en_AU
dc.date.statistics2008-09-03en_AU
dc.description.abstractProviding estimates of past climate changes on interannual - millenial timescales requires suitable regression models between climate and climate proxies. Many proxies appear to show relationships with climate that are timescale dependent. Any proxy-climate model should be able to replicate the major patterns that are observed at multiple timescales. Here we develop a new climate-isotope regression model for speleothems from a middle latitude site. In the low to middle latitudes, daily variation in precipitation isotopes (within individual months) is largely negatively correlated with daily rainfall amount. On interdecadal timescales, though, this relationship appears to be nonstationary. These two points provide a theoretical basis for a new climate-isotope regression model in which the slope and the intercept of a δ O-18(day) - P-day line for a given month are modulated by organized patterns of climate variability, such as the extratropical zonal waves (including the annular modes). In constructing this new regression model, we show how daily precipitation - δ O-18 relationships can be estimated using only monthly δ O-18 data and daily rainfall amounts. The new regression model provides a consistent picture of O-18 variability over a range of timescales, and this has not been the case with any previous climate-isotope regression model. © 2008, American Geophysical Unionen_AU
dc.identifier.articlenumberD17103en_AU
dc.identifier.citationFischer, M. J., & Treble, P. C. (2008). Calibrating climate-δ O-18 regression models for the interpretation of high-resolution speleothem δ O-18 time series. Journal of Geophysical Research: Atmospheres, 113(D17), D17103. doi:10.1029/2007JD009694en_AU
dc.identifier.govdoc1090en_AU
dc.identifier.issn0148-0227en_AU
dc.identifier.issueD17en_AU
dc.identifier.journaltitleJournal of Geophysical Research: Atmospheresen_AU
dc.identifier.urihttp://dx.doi.org/10.1029/2007JD009694en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1343en_AU
dc.identifier.volume113en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Unionen_AU
dc.subjectRegression analysisen_AU
dc.subjectClimatic changeen_AU
dc.subjectIsotopesen_AU
dc.subjectPrecipitationen_AU
dc.subjectAustraliaen_AU
dc.subjectTemperature rangeen_AU
dc.titleCalibrating climate-δ18O regression models for the interpretation of high-resolution speleothem δ18O time seriesen_AU
dc.typeJournal Articleen_AU
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