Excess radiocarbon constraints on air‐sea gas exchange and the uptake of CO2 by the oceans
Excess radiocarbon constraints on air‐sea gas exchange and the uptake of CO2 by the oceans
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DOI：
10.1029/2005gl025408
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发表时间：
2006-06
影响因子：
5.2
通讯作者：
T. Naegler;P. Ciais;K. Rodgers;I. Levin
中科院分区：
文献类型：
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作者：
T. Naegler;P. Ciais;K. Rodgers;I. Levin
我们重新评估了全球海洋过量放射性碳清单（IE）对海气交换的限制。我们发现，气体交换标度参数aq不能单独由IE约束。不同全球风速数据集的不可忽略的偏差需要根据所选风场仔细调整aq。此外，aq取决于风场的空间和时间分辨率。我们开发了一个新的风速和库存归一化的气体交换参数aqN，该参数考虑了这些偏差，并且很容易适应任何新的IE估计。我们的研究得出月平均风的平均估计值aq为0.32 ± 0.05，低于Wanninkhof（1992）的先前估计值（0.39）。我们计算出全球年平均活塞速度为16.7 ± 2.9 cm/hr，大气和海洋之间的总CO2通量为73 ± 10 PgC/yr，显着低于以前的研究结果。
We re‐assess the constraints that estimates of the global ocean excess radiocarbon inventory (IE) place on air‐sea gas exchange. We find that the gas exchange scaling parameter aq cannot be constrained by IE alone. Non‐negligible biases in different global wind speed data sets require a careful adaptation of aq to the wind field chosen. Furthermore, aq depends on the spatial and temporal resolution of the wind fields. We develop a new wind speed‐ and inventory‐normalized gas exchange parameter aqN which takes into account these biases and which is easily adaptable to any new estimate of IE. Our study yields an average estimate of aq of 0.32 ± 0.05 for monthly mean winds, lower than the previous estimate (0.39) from Wanninkhof (1992). We calculate a global annual average piston velocity for CO2 of 16.7 ± 2.9 cm/hr and a gross CO2 flux between atmosphere and ocean of 73 ± 10 PgC/yr, significantly lower than results from previous studies.