CO2 evolution during the last millennium as recorded by Antarctic and Greenland ice
CO2 evolution during the last millennium as recorded by Antarctic and Greenland ice
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DOI：
10.3402/tellusb.v47i1-2.16046
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发表时间：
1995-02
期刊：
影响因子：
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通讯作者：
J. Barnola;M. Anklin;J. Porcheron;D. Raynaud;J. Schwander;B. Stauffer
中科院分区：
文献类型：
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作者：
J. Barnola;M. Anklin;J. Porcheron;D. Raynaud;J. Schwander;B. Stauffer
为了详细研究工业化前(约公元900年)的CO2水平及其时间变化，在两个实验室对格陵兰和南极的几个冰芯进行了分析，并与以往的记录进行了比较。两个实验室之间以及同一半球的不同核心之间的一致性很好。然而，对北半球(格陵兰岛)和南半球(南极洲)记录的比较显示，北半球的数值普遍高于南半球，从本世纪之交的20ppmv到18世纪前后几乎为零。根据我们目前对碳循环的了解，20ppmv的半球间梯度是不现实的。因此，在记录中最古老的部分，至少有一个剖面不应该代表真实的大气二氧化碳浓度。一篇由Anklin等人撰写的配套论文。(提交)，讨论了一旦被困在冰中，可能会改变大气二氧化碳的过程。由于南极的杂质含量比格陵兰冰低一个数量级，我们对南极记录的信心要大得多。D47和D57(阿德利大陆)的新结果证实了13世纪末Siegenthaler等人观测到的约10ppmv的CO2波动。(1988)在南极钻探的冰芯上。这种波动对应于碳循环的一个小的不平衡(∼0.3GTC/年)，但其持续时间导致了对大气的大量累积输入。从气候噪声和可变性的角度讨论了在工业化前水平观察到的变化。DOI：10.1034/j.1600-0889.47.Issue1.22.x
In order to study in detail the pre-industrial CO 2 level (back to about 900 AD) and its temporal variations, several ice cores from Greenland and Antarctica were analysed in two laboratories, and compared with previous records. The agreement between the two laboratories and between the different cores of the same hemisphere is good. However, the comparison of the northern hemisphere (Greenland) and southern hemisphere (Antarctica) records shows values systematically higher in the north than in the south, ranging from 20 ppmv at the turn of this millennium to nearly zero around the 18th century. Based on our present knowledge of the carbon cycle, an inter-hemispheric gradient of 20 ppmv is unrealistic. Thus, in the oldest part of the record, at least one profile should not represent the true atmospheric CO 2 concentrations. A companion paper by Anklin et al. (submitted), discusses the possible processes which can alter the atmospheric CO 2 once trapped in the ice. Due to the fact that the impurity content is one order of magnitude lower in the Antarctic than in the Greenland ice, we are much more confident in the Antarctic record. The new results from D47 and D57 (Adelie Land) presented in this paper, confirm the CO 2 fluctuation of about 10 ppmv at the end of the 13th century, previously observed by Siegenthaler et al. (1988) on an ice core drilled at South Pole. This fluctuation corresponds to a small imbalance of the carbon cycle (∼ 0.3 GT C/ yr), but its duration led to a significant cumulative input into the atmosphere. The changes observed in the pre-industrial level are discussed in terms of climatic noise and variability. DOI: 10.1034/j.1600-0889.47.issue1.22.x