Stable isotope chronology and climate signal calibration in neotropical montane cloud forest trees

Publication Status is "Submitted" Or "In Press: 
Yes
LDEO Publication: 
Yes
Publication Type: 
Year of Publication: 
2008
Journal Title: 
Journal of Geophysical Research-Biogeosciences
Journal Date: 
Aug 30
Volume: 
113
Issue: 
G3
Pages: 
-
ISBN Number: 
0148-0227
Accession Number: 
ISI:000258823000001
LDEO Publication Number: 
7160
Abstract: 

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 delta O-18 measurements are used to identify regular cycles in wood of up to 9 parts per thousand, 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.

Notes: 

342ZVTimes Cited:0Cited References Count:74

DOI: 
Doi 10.1029/2007jg000613