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A possible paleoclimatic ENSO indicator in the spatial variation of annual tree‐ring 14 C
Author(s) -
Jirikowic John L.,
Kalin Robert M.
Publication year - 1993
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/93gl00498
Subject(s) - el niño southern oscillation , climatology , multivariate enso index , southern oscillation , dendrochronology , environmental science , proxy (statistics) , spatial variability , variation (astronomy) , atmospheric sciences , physical geography , geology , geography , paleontology , statistics , physics , mathematics , machine learning , computer science , astrophysics
Preliminary investigations show regional differences in atmospheric 14 C activity archived in tree‐ring cellulose may reflect oceanic and atmospheric shifts associated with ENSO (El Niño‐Southern Oscillation) events. Much of the shared variation between sites in Washington and Arizona can be attributed to global forcings such as anthropogenic 14 C‐depleted CO 2 emissions and modulation of 14 C production. The contrasted residual variation between the Washington and Arizona data sets correlates with the annual Southern Oscillation Index (SOI) of the previous year. The spatial differences between Δ 14 C data sets may provide a proxy indicator of ENSO phenomenon.