Vertical profiles of the O2/N2 ratio in the stratosphere over Japan and Antarctica
Vertical profiles of the O2/N2 ratio in the stratosphere over Japan and Antarctica
复制标题
日本和南极洲平流层 O2/N2 比率的垂直剖面
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
T. Yamanouchi
中科院分区：
文献类型：
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作者：
S. Ishidoya;S. Sugawara;G. Hashida;S. Morimoto;S. Aoki;T. Nakazawa;T. Yamanouchi
为了研究平流层O2的时空行为，使用低温采样器在日本三陆和南极洲锡奥瓦采集了空气样本，并分析了δ(O2/N2)、δ15N的O2和δ18O的O2。所有这些成分的测量值都随着高度的增加而逐渐减小。平流层中层和下层的δ(O2/N_2)、δ_(15N)和δ_(18)O的差值分别约为每兆克250、100和180。观测到的δ15N和δ18O的平流层廓线与稳态一维涡扩散/分子扩散模型的计算结果相一致，这表明平流层δ(O2/N2)的上升是由于O2和N2分子的重力分离引起的。经重力分离校正后，三陆上空20-25公里高度的平均平流层δ(O2/N_2)始终高于日本上空对流层上层δ(O_2/N_2)值，并呈长期下降趋势。根据重力分离校正的平流层δ(O2/n2)值的过去时间变化和相应大气样品的平均年龄(与其在对流层中的长期趋势相对应)，估计1993年10月至2001年9月的陆地生物圈和海洋δ平均吸收分别为1.1±1.3GTC yr−1和1.8±1.3GTC yr CO2 1。
To examine the spatial and temporal behavior of stratospheric O2, air samples were collected using a cryogenic sampler over Sanriku, Japan and Syowa, Antarctica and analyzed for δ(O2/N2), δ15N of N2 and δ18O of O2. The measured values of all these components decreased gradually with height. The differences in δ(O2/N2), δ15N and δ18O between the middle and lowermost levels of the stratosphere were about 250, 100, and 180 per meg, respectively. The observed stratospheric profiles of δ15N and δ18O were in agreement with those calculated using a steady‐state 1‐dimensional eddy‐diffusion/molecular‐diffusion model, which suggests that the upward decrease of stratospheric δ(O2/N2) is caused by a gravitational separation of O2 and N2 molecules. The averaged stratospheric δ(O2/N2) at heights above 20–25 km over Sanriku, corrected for the gravitational separation, was always higher than the upper tropospheric δ(O2/N2) value over Japan, and it decreased secularly. From the past temporal δ(O2/N2) variation deduced from the gravitational separation‐corrected stratospheric δ(O2/N2) values and the mean ages of the respective air samples, which corresponds to its secular trend in the troposphere, average terrestrial biospheric and oceanic CO2 uptake for October 1993–September 2001 were estimated to be 1.1 ± 1.3 and 1.8 ± 1.3 GtC yr−1, respectively.