Abstract Less than three decades ago only a small fraction of the Arctic Ocean (AO) was ice free and then only for short periods. The ice cover kept sea surface pCO2 at levels lower relative to other ocean basins that have been exposed year round to ever increasing atmospheric levels. In this study, we evaluate sea surface pCO2 measurements collected over a 6‐year period along a fixed cruise track in the Canada Basin. The measurements show that mean pCO2 levels are significantly higher during low ice years. The pCO2 increase is likely driven by ocean surface heating and uptake of atmospheric CO2 with large interannual variability in the contributions of these processes. These findings suggest that increased ice‐free periods will further increase sea surface pCO2, reducing the Canada Basin's current role as a net sink of atmospheric CO2.

中文翻译：

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随着冰盖减少，北冰洋碳循环发生变化


摘要 不到三十年前，北冰洋（AO）只有一小部分是无冰的，而且时间很短。与常年暴露在不断增加的大气水平的其他海洋盆地相比，冰盖使海面二氧化碳浓度保持在较低水平。在这项研究中，我们评估了 6 年期间沿加拿大盆地固定巡航航线收集的海面 pCO2 测量值。测量结果显示，在低冰年期间，平均 pCO2 水平显着升高。 pCO2 的增加可能是由海洋表面加热和大气中二氧化碳的吸收驱动的，这些过程的贡献存在很大的年际变化。这些发现表明，无冰期的增加将进一步增加海面二氧化碳分压，从而降低加拿大盆地目前作为大气二氧化碳净汇的作用。