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Stable isotope chronology and climate signal calibration in neotropical montane cloud forest trees
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona, USA
Department of Geosciences, University of Arizona, Tucson, Arizona, USA
Laboratory of Tree-Ring Research, University of Arizona, Tucson, Arizona, USA
Department of Geosciences, University of Arizona, Tucson, Arizona, USA
Department of Biology, Bowdoin College, Brunswick, Maine, USA
Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts, USA
Tropical montane cloud forests are ecosystems intrinsically linked to a narrow range of geographic and meteorological conditions, making them potentially sensitive to small changes in precipitation or temperature. We investigate the potential application of stable isotope analysis to cloud forest dendroclimatology at Monteverde in Costa Rica in order to be able to extract both chronological and paleoclimate information from trees without annual growth rings. High-resolution δ 18O measurements are used to identify regular cycles in wood of up to 9‰, which are associated with seasonal changes in precipitation and moisture sources. The calculated annual growth rates derived from the isotope time series match those observed from long-term basal growth measurements. Interannual variability in the oxygen isotope ratio of lower forest trees is primarily related to interannual changes in wet season precipitation. Forward modeling independently supports our detection of both annual chronology and a climate signal. The confirmation of annual chronology and sensitivity to interannual climate anomalies suggests that tropical cloud forest dendroclimatology can be used to investigate local and regional hydroclimatic variability and change.
Received 3 October 2007; accepted 15 May 2008; published 30 August 2008.
Citation: (2008), Stable isotope chronology and climate signal calibration in neotropical montane cloud forest trees, J. Geophys. Res., 113, G03030, doi:10.1029/2007JG000613.
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