CARINA oxygen data in the Atlantic Ocean
CARINA oxygen data in the Atlantic Ocean
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大西洋 CARINA 氧气数据
DOI：
10.5194/essd-1-87-2009
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发表时间：
2009
影响因子：
11.4
通讯作者：
A. Körtzinger
中科院分区：
文献类型：
--
作者：
I. Stendardo;N. Gruber;A. Körtzinger
摘要。在CARINA（大西洋中的二氧化碳）项目中，汇集了一个包含来自大西洋、北冰洋和南大洋的许多先前未发表的水文数据的新数据集，并对其进行了仔细的质量控制（QC）程序。在此，我们展示了该数据集中大西洋区域的溶解氧测量值，并详细描述了旨在确保数据内部一致性的二级质量控制程序。这是通过交叉分析实现的，即对不同时间不同航次采样的地点的深海数据进行比较。然后通过一种反演程序确定对各个航次的初始调整，该程序计算出一组调整量，要求调整量最小，同时以最优方式减少偏差。然后由CARINA成员对初始调整进行审查，只有那些符合以下两个标准的调整才被采用：（i）该区域不受明显的时间变化影响；（ii）调整必须基于每个航次至少三个站点。对于不符合这些标准的航次，不建议进行调整。最终的CARINA - 氧数据集包含来自98次航次期间9491个站点的103414个氧样本，涵盖了三十年。在北纬约40°以北的北大西洋，氧数据的采样密度特别好，尤其是1987年之后。相比之下，南大西洋的样本密度要低得多。一些航次的数据质量似乎较差，随后从调整后的数据集中被剔除。在调整后的数据集中包含的数据中，20%进行了调整，平均调整幅度为2%。由于实现了内部一致性，所得结果非常适合用于生成改进的气候学资料或研究海洋含氧量的长期变化。然而，对于需要高精度的问题，例如饱和度状态的计算，调整后的数据并不一定比未调整的数据更适用。
Abstract. In the CARINA (Carbon dioxide in the Atlantic Ocean) project, a new dataset with many previously unpublished hydrographic data from the Atlantic, Arctic and Southern Ocean was assembled and subjected to careful quality control (QC) procedures. Here, we present the dissolved oxygen measurements in the Atlantic region of the dataset and describe in detail the secondary QC procedures that aim to ensure that the data are internally consistent. This is achieved by a cross-over analysis, i.e. the comparison of deep ocean data at places that were sampled by different cruises at different times. Initial adjustments to the individual cruises were then determined by an inverse procedure that computes a set of adjustments that requires the minimum amount of adjustment and at the same time reduces the offsets in an optimal manner. The initial adjustments were then reviewed by the CARINA members, and only those that passed the following two criteria were adopted: (i) the region is not subject to substantial temporal variability, and (ii) the adjustment must be based on at least three stations from each cruise. No adjustment was recommended for cruises that did not fit these criteria. The final CARINA-Oxygen dataset has 103414 oxygen samples from 9491 stations obtained during 98 cruises covering three decades. The sampling density of the oxygen data is particularly good in the North Atlantic north of about 40° N especially after 1987. In contrast, the sample density in the South Atlantic is much lower. Some cruises appear to have poor data quality, and were subsequently omitted from the adjusted dataset. Of the data included in the adjusted dataset, 20% were adjusted with a mean adjustment of 2%. Due to the achieved internal consistency, the resulting product is well suited to produce an improved climatology or to study long-term changes in the oxygen content of the ocean. However, the adjusted dataset is not necessarily better suited than the unadjusted data to address questions that require a high level of accuracy, such as the computation of the saturation state.
影响因子：
56.9
作者：
Stramma, Lothar;Johnson, Gregory C.;Mohrholz, Volker
通讯作者：
Mohrholz, Volker