Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability
作者： R. J. W. Brienen , G. Helle , T. L. Pons , J.-L. Guyot , M. Gloor
关键词: δ18O 、 Climatology 、 Amazon rainforest 、 Water cycle 、 Isotopes of oxygen 、 Discharge 、 Proxy (climate) 、 Geography 、 Dendrochronology 、 Ice core
摘要: We present a unique proxy for the reconstruction of variation in precipitation over Amazon: oxygen isotope ratios annual rings tropical cedar (Cedrela odorata). A century-long record from northern Bolivia shows that tree preserve signal isotopes during wet season, with weaker influences temperature and vapor pressure. Tree ring δ18O correlates strongly distant stations center west basin, Andean ice core showing is coherent large areas. The most basin-wide Amazon river discharge. attribute strength this (negative) correlation mainly to cumulative rainout processes (Rayleigh distillation) air parcels westward transport across basin. further find clear signature El Nino-Southern Oscillation (ENSO) record, strong ENSO recent decades, but influence 1925 1975 indicating decadal scale controls on hydrological cycle. exhibits significant increase 20th century consistent increases lake records, which we tentatively increased water into Taking these data together, our reveals fresh path diagnose improve understanding trends cycle world’s largest catchment.
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