Chemical and physical oceanography on 131 CTD casts from METEOR cruise M59/2

The oceans absorb and store a significant portion of anthropogenic CO2 emissions, but large uncertainties remain in the quantification of this sink. An improved assessment of the present and future oceanic carbon sink is therefore necessary to provide recommendations for long-term global carbon cycle and climate policies. The formation of North Atlantic Deep Water (NADW) is a unique fast track for transporting anthropogenic CO2 into the ocean's interior, making the deep waters rich in anthropogenic carbon. Thus the Atlantic is presently estimated to hold 38% of the oceanic anthropogenic CO2 inventory, although its volume makes up only 25% of the world ocean. Here we analyze the inventory change of anthropogenic CO2 in the Atlantic between 1997 and 2003 and its relationship to NADW formation. For the whole region between 20°S and 65°N the inventory amounts to 32.5 ± 9.5 Petagram carbon (Pg C) in 1997 and increases up to 36.0 ± 10.5 Pg C in 2003. […]

海洋吸收并储存了大量的由人类活动产生的二氧化碳排放，然而，对于这一汇的量化仍存在较大不确定性。因此，对当前及未来海洋碳汇的评估显得尤为迫切，以便为长期全球碳循环和气候政策提供建议。北大西洋深层水（NADW）的形成是人为二氧化碳进入海洋内部的独特快速通道，使得深层水富含人为碳。因此，目前估计大西洋持有海洋人为二氧化碳库存的38%，尽管其体积仅占全球海洋的25%。在本研究中，我们分析了1997年至2003年间大西洋人为二氧化碳库存的变化及其与NADW形成的关联。在20°S至65°N的整个区域，1997年的库存量为32.5 ± 9.5百万吨碳（Pg C），并增加到2003年的36.0 ± 10.5百万吨碳。