Gravitational separation of major atmospheric components of nitrogen and oxygen in the stratosphere
Gravitational separation of major atmospheric components of nitrogen and oxygen in the stratosphere
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DOI：
10.1029/2007gl030456
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发表时间：
2008-02-13
影响因子：
5.2
通讯作者：
Nakazawa, Takakiyo
中科院分区：
文献类型：
--
作者：
Ishidoya, Shigeyuki;Sugawara, Satoshi;Nakazawa, Takakiyo
为了研究平流层中大气成分的重力分离，对在日本、北极和南极洲采集的空气样本进行了 N(2) 中的 delta(15)N 和 O(2) 中的 delta(18)O 分析。重力分离是纬度的函数，在北极上空的极地涡旋内显示出最大的影响。重力分离（使用稳态一维涡流扩散/分子扩散模型计算）与CO(2)年龄（使用一维时间相关涡流扩散模型计算）之间的关系表明，观测到的重力分离基本上是扩散分离的结果，但受到平流层空气经向循环的修改。我们还获得了重力分离和 N(2)O 浓度之间的紧凑关系。通过比较 N(2)O 浓度 > 125 ppb 和 < 45 ppb 的两个高度区间的重力分离，发现下降空气对北极的影响比对日本的影响更为显着。发现 N(2)O 浓度在 45 至 125 ppb 之间的区域中重力分离随高度的变化比其他区域更弱。引用：Ishidoya, S.、S. Sugarara、S. Morimoto、S. Aoki 和 T. Nakazawa (2008)，平流层中氮和氧主要大气成分的重力分离。
To investigate the gravitational separation of atmospheric components in the stratosphere, air samples collected over Japan, the Arctic and the Antarctic were analyzed for delta(15)N of N(2) and delta(18)O of O(2). The gravitational separation is a function of latitude, showing the largest effect inside the polar vortex over the Arctic. The relationship between the gravitational separation ( calculated using a steady-state 1-dimensional eddy-diffusion/molecular-diffusion model) and the CO(2) age (calculated using a 1-dimensional time dependent eddy-diffusion model) suggests that the observed gravitational separation is fundamentally a result of diffusive separation but modified by meridional circulation of air in the stratosphere. We also obtain a compact relationship between the gravitational separation and the N(2)O concentration. By comparing the gravitational separations at two height intervals with the N(2)O concentrations > 125 ppb and < 45 ppb, the effect of descending air is found to be more significant over the Arctic than over Japan. The variation in the gravitational separation with height is found to be weaker in region with the N(2)O concentrations between 45 and 125 ppb than in other regions. Citation: Ishidoya, S., S. Sugawara, S. Morimoto, S. Aoki, and T. Nakazawa (2008), Gravitational separation of major atmospheric components of nitrogen and oxygen in the stratosphere.