AI Article Synopsis
- - Long-term observations of CO levels and carbon isotopes show that North America's carbon uptake significantly increases during El Niño years compared to La Niña years, by about 0.61 PgC per year from 2007 to 2015.
- - North American net ecosystem exchange (NEE) is influenced by seasonal temperature fluctuations, with a notable opposite correlation, while water availability consistently affects NEE throughout the year.
- - The findings indicate that during El Niño, favorable conditions like higher water availability and optimal temperatures lead to greater carbon absorption in North America.
Article Abstract
Long-term atmospheric CO mole fraction and δCO 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 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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6551193 | PMC |
| http://dx.doi.org/10.1126/sciadv.aaw0076 | DOI Listing |
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