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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Three-dimensional simulation of stratospheric gravitational separation using the NIES global atmospheric tracer transport model
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Three-dimensional simulation of stratospheric gravitational separation using the NIES global atmospheric tracer transport model

机译：利用NIES全球大气示踪剂传输模型对平流层重力分离进行三维模拟

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A three-dimensional simulation of gravitational separation, defined as the process of atmospheric molecule separation under gravity according to their molar masses, is performed for the first time in the upper troposphere and lower stratosphere. We analyze distributions of two isotopes with a small difference in molecular mass ( sup13/supCsup16/supOsub2/sub ( Msubi/sub=45 ) and sup12/supCsup16/supOsub2/sub ( Msubi/sub=44 )) simulated by the National Institute for Environmental Studies (NIES) chemical transport model (TM) with a parameterization of molecular diffusion. The NIES model employs global reanalysis and an isentropic vertical coordinate and uses optimized COsub2/sub fluxes. The applicability of the NIES TM to the modeling of gravitational separation is demonstrated by a comparison with measurements recorded by high-precision cryogenic balloon-borne samplers in the lower stratosphere. We investigate the processes affecting the seasonality of gravitational separation and examine the age of air derived from the tracer distributions modeled by the NIES TM. We find a strong relationship between age of air and gravitational separation for the main climatic zones. The advantages and limitations of using age of air and gravitational separation as indicators of the variability in the stratosphere circulation are discussed.
机译：首次在对流层和平流层下部进行了重力分离的三维模拟，这是根据重力的摩尔质量进行的大气分子分离过程。我们分析了两种分子质量差异较小的同位素（ 13 C 16 O 2 （M i = 45）和 12 C 16 O 2 （M i = 44））具有分子扩散参数化的环境研究（NIES）化学迁移模型（TM）。 NIES模型采用全局重新分析和等熵垂直坐标，并使用优化的CO 2 通量。通过与平流层下部的高精度低温球囊采样器记录的测量值的比较，证明了NIES TM在重力分离建模中的适用性。我们调查了影响重力分离季节的过程，并检查了由NIES TM建模的示踪剂分布得出的空气年龄。我们发现空气的年龄与主要气候区的重力分离之间存在很强的关系。讨论了使用空气年龄和重力分离作为平流层环流变化指标的优缺点。

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