Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603701l&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 3, CiteID L03701
Physics
2
Hydrology: Hydroclimatology, Geochemistry: Stable Isotope Geochemistry (0454, 4870), Paleoceanography: El Nino (4522), Global Change: Climate Dynamics (0429, 3309), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504)
Scientific paper
The climate dynamical controls on rainfall oxygen isotope values (δ 18Orain) are poorly constrained in most areas. In Central America, rainfall variations are associated with sea surface temperature anomalies in the Pacific and Atlantic Oceans, yet the response in δ 18Orain has not been adequately investigated. Analysis of a 30-year time series of δ 18Orain in Panama was used to test the hypothesis that δ 18Orain variations are forced by anomalies in rainfall and sea surface temperatures (SSTAs) in the bordering tropical oceans. The results show that δ 18Orain values in Panama are positively (negatively) correlated with SSTAs in the Pacific Ocean (Caribbean Sea). The data are consistent with a dominant 'amount effect' whereby lowest δ 18O values are associated with a northerly position of the Intertropical Convergence Zone when regional rainfall is high. The source effect (Caribbean vs. Pacific), as constrained by wind direction, does not appear to be an important control on the temporal variations in δ 18Orain.
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