Reconciliation of excess 14C-constrained global CO2 piston velocity estimates

Reconciliation of excess 14C-constrained global CO2 piston velocity estimates
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过量 14C 约束的全球 CO2 活塞速度估计的协调

DOI:
10.1111/j.1600-0889.2008.00408.x
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发表时间:
2009
期刊:
Tellus B: Chemical and Physical Meteorology
影响因子:
--
通讯作者:
T. Naegler
T. Naegler
中科院分区:
--
文献类型:
--
作者:
T. Naegler

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海洋过量放射性碳数据被广泛用作海气交换的约束条件。然而,Naegler等人最近对全球平均活塞速度的估计,Krakauer等人,Sweeney等人和Müller等人的结果有很大不同,尽管他们都是基于GLODAP数据库中的过量放射性碳数据。在这里,我表明,这些估计的dkk dkk可以调和,如果第一,考虑到由于CO2的净吸收的海洋放射性碳清单的变化;第二,如果现实的重建海面δ 14 C的使用和第三,如果dkk dkk dkk是一致的报告或不规范化的施密特数为660。应用这些校正后,这些研究的非标准化估计值范围在15.1和18.2 cmh-1之间。然而,这些估计值都不能被认为是唯一正确的值。因此,我建议使用这里提出的修正后的平均值(16.5±3.2 cm h-1)作为全球平均非归一化活塞速度的最佳估计值,从而得出20世纪90年代中期海洋到大气的总CO2通量为76 ± 15 PgC yr-1。
Oceanic excess radiocarbon data is widely used as a constraint for air–sea gas exchange.However, recent estimates of the global mean piston velocity 〈k〉 from Naegler et al., Krakauer et al., Sweeney et al. and Müller et al. differ substantially despite the fact that they all are based on excess radiocarbon data from the GLODAP data base. Here I show that these estimates of 〈k〉 can be reconciled if first, the changing oceanic radiocarbon inventory due to net uptake of CO2 is taken into account; second, if realistic reconstructions of sea surface δ14C are used and third, if 〈k〉 is consistently reported with or without normalization to a Schmidt number of 660. These corrections applied, unnormalized estimates of 〈k〉 from these studies range between 15.1 and 18.2 cmh-1. However, none of these estimates can be regarded as the only correct value for 〈k〉. I thus propose to use the ‘average’ of the corrected values of 〈k〉 presented here (16.5±3.2 cmh-1) as the best available estimate of the global mean unnormalized piston velocity 〈k〉, resulting in a gross ocean-to-atmosphere CO2 flux of 76 ± 15 PgC yr-1 for the mid-1990s.
DOI: 10.1029/2005gl025408
发表时间: 2006-06
影响因子: 5.2
作者:
T. Naegler;P. Ciais;K. Rodgers;I. Levin
通讯作者: T. Naegler;P. Ciais;K. Rodgers;I. Levin