Continental shelves as a variable but increasing global sink for atmospheric carbon dioxide. Academic Article uri icon


  • It has been speculated that the partial pressure of carbon dioxide (pCO2) in shelf waters may lag the rise in atmospheric CO2. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO2. This result is based on analysis of long-term trends in the air-sea pCO2 gradient (pCO2) using a global surface ocean pCO2 database spanning a period of up to 35 years. Using wintertime data only, we find that pCO2 increased in 653 of the 825 0.5 cells for which a trend could be calculated, with 325 of these cells showing a significant increase in excess of +0.5atmyr-1 (p<0.05). Although noisier, the deseasonalized annual data suggest similar results. If this were a global trend, it would support the idea that shelves might have switched from a source to a sink of CO2 during the last century.

published proceedings

  • Nat Commun

altmetric score

  • 202.05

author list (cited authors)

  • Laruelle, G. G., Cai, W., Hu, X., Gruber, N., Mackenzie, F. T., & Regnier, P.

citation count

  • 83

complete list of authors

  • Laruelle, Goulven G||Cai, Wei-Jun||Hu, Xinping||Gruber, Nicolas||Mackenzie, Fred T||Regnier, Pierre

publication date

  • January 2018