The El Niño/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 CO 2 from tropical forests. Both these effects tend to enrich the atmospheric CO 2 in radiocarbon ( 14 C). To examine the relationship of interannual variations of 14 C in the atmospheric CO 2 with the ENSO events, statistical coherence between tropospheric 14 CO 2 with various ENSO indices are analyzed here. The warm ENSO phases found to correlate with positive tropospheric 14 CO 2 anomalies.
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Koushik Dutta (2002) studied this question.
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