Recent evidence for a strengthening CO2 sink in the Southern Ocean from carbonate system measurements in the Drake Passage (2002–2015)

摘要: We present a 13 year (2002–2015) semimonthly time series of the partial pressure CO2 in surface water (pCO2surf) and other carbonate system parameters from Drake Passage. This record shows clear increase magnitude sea-air pCO2 gradient, indicating strengthening sink agreement with recent large-scale analyses world oceans. The rate pCO2surf north Antarctic Polar Front (APF) is similar to atmospheric (pCO2atm) trend, whereas south APF slower than pCO2atm trend. high-frequency observations indicate that an absence winter total (TCO2) cooling summer sea temperatures are largely responsible for increasing uptake APF. Muted trends TCO2 also provide temporary stability already close undersaturation respect aragonite.