The El Ni¿o/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 (14C). To examine the relationship of interannual variations of 14C in the atmospheric CO2 with the ENSO events, statistical coherence between tropospheric 14CO2 with various ENSO indices are analyzed here. The warm ENSO phases found to correlate with positive tropospheric 14CO2 anomalies.