Sea-ice loss amplifies summertime decadal CO2 increase in the western Arctic Ocean

Rapid climate warming and sea-ice loss have induced major changes in the sea surface partial pressure of CO2 ($p_{{\mathrm {CO}}_2}). However, the long-term trends in the western Arctic Ocean are unknown. Here we show that in 1994–2017, summer p_{{\mathrm {CO}}_2} in the Canada Basin increased at twice the rate of atmospheric increase. Warming and ice loss in the basin have strengthened the p_{{\mathrm {CO}}_2} seasonal amplitude,...