A possible paleoclimatic ENSO indicator in the spatial variation of annual tree‐ring 14C

John L. Jirikowic, Robert M. Kalin

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Preliminary investigations show regional differences in atmospheric 14C 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 14C‐depleted CO2 emissions and modulation of 14C 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 Δ14C data sets may provide a proxy indicator of ENSO phenomenon.

Original languageEnglish
Pages (from-to)439-442
Number of pages4
JournalGeophysical Research Letters
Issue number6
Publication statusPublished - 1 Jan 1993


  • spatial variation of annual tree‐ring 14C
  • paleoclimatic ENSO indicator
  • tree‐ring cellulose

Cite this