A possible paleoclimatic enso indicator in the spatial variation of annual tree-ring C-14

J.L. Jirikowic, R. Kalin

Research output: Contribution to journalArticle


Preliminary investigations show regional differences in atmospheric C-14 activity archived in tree-ring cellulose may reflect oceanic and atmospheric shifts associated with ENSO (El Nino-Southern Oscillation) events. Much of the shared variation between sites in Washington and Arizona can be attributed to global forcings such as anthropogenic C-14-depleted CO2 emissions and modulation of C-14 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 DELTAC-14 data sets may provide a proxy indicator of ENSO phenomenon.
Original languageEnglish
Pages (from-to)439-442
Number of pages3
JournalGeophysical Research Letters
Issue number6
Publication statusPublished - Mar 1993


  • tree-ring cellulose
  • oceanic and atmospheric shifts
  • ENSO events
  • El Nino-Southern Oscillation events

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