Coherence of tropospheric 14CO2 with El Nino/Southern Oscillation -: art. no. 1987

[1] The El Nino/ Southern Oscillation (ENSO) events cause significant perturbation in the global carbon cycle, due to reduced upwelling in the equatorial Pacific and enhanced release of biospheric CO2 from tropical forests. Both these effects tend to enrich the atmospheric CO2 in radiocarbon (C-14). To examine the relationship of interannual variations of C-14 in the atmospheric CO2 with the ENSO events, statistical coherence between tropospheric (CO2)-C-14 with various ENSO indices are analyzed here. The warm ENSO phases found to correlate with positive tropospheric (CO2)-C-14 anomalies.