Enhanced North American carbon uptake associated with El Niño.
Where this comes from
- Record sourced from PubMed, PMID 31183402.
- Also identified by DOI 10.1126/sciadv.aaw0076 and PMC identifier 6551193.
- Licence recorded as CC BY-NC.
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Abstract
Long-term atmospheric CO<sub>2</sub> mole fraction and δ<sup>13</sup>CO<sub>2</sub> observations over North America document persistent responses to the El Niño-Southern Oscillation. We estimate these responses corresponded to 0.61 (0.45 to 0.79) PgC year<sup>-1</sup> more North American carbon uptake during El Niño than during La Niña between 2007 and 2015, partially offsetting increases of net tropical biosphere-to-atmosphere carbon flux around El Niño. Anomalies in derived North American net ecosystem exchange (NEE) display strong but opposite correlations with surface air temperature between seasons, while their correlation with water availability was more constant throughout the year, such that water availability is the dominant control on annual NEE variability over North America. These results suggest that increased water availability and favorable temperature conditions (warmer spring and cooler summer) caused enhanced carbon uptake over North America near and during El Niño.