VERTICAL TRANSPORT AND PHOTOCHEMISTRY IN THE TERRESTRIAL MESOSPHERE AND LOWER THERMOSPHERE (50-120 KM)
VERTICAL TRANSPORT AND PHOTOCHEMISTRY IN THE TERRESTRIAL MESOSPHERE AND LOWER THERMOSPHERE (50-120 KM)
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DOI：
10.1029/ja086ia05p03617
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发表时间：
1981-01-01
影响因子：
2.8
通讯作者：
WATERS, JW
中科院分区：
文献类型：
--
作者：
ALLEN, M;YUNG, YL;WATERS, JW
利用一维高层大气模式研究了动力学、太阳周期通量变化和垂直输送对地球中层和低热层中长寿命氢-碳-氧化合物分布的耦合影响。计算中考虑到了重要的化学反应，并使用了火箭测量的太阳最小和最大时的太阳通量。适用于中间层的光解离速率用球壳大气形式主义确定;使用O2舒曼-龙格带和CO2截面的温度依赖性的详细校正。然后导出了涡旋扩散剖面，该剖面与Aladdin 74质谱仪对低热层中O、O2、CO2和Ar原子的测量结果以及在1080 km处O3最小值的观测结果相一致。115 GHz的CO无线电发射线计算的CO混合比剖面预测与新的涡扩散剖面比较，以及与最近的观察W。J·威尔逊计算的CO混合比配置文件和以前的理论和观测测定之间的差异进行了讨论。我们推导出的涡流扩散轮廓在92公里处有一个突然的减少，这是必要的，以产生在98公里处出现在阿拉丁74测量的原子O峰。这一停滞区显然是高层大气的一个经常性或持续性特征，因为几年来在不同季节用不同的技术观察到了98公里附近的原子O峰。低温层中通过同层顶的缓慢涡流扩散也是早期Ar/N2火箭测量研究的结论。如果能够定期同时观测不同种类的话，本文的分析方法今后可用于监测中层大气动态的变化。
The coupled effects of kinetics, solar cycle flux variations and vertical transport on the distribution of long‐lived hydrogen‐carbon‐oxygen compounds in the terrestrial mesosphere and lower thermosphere are studied using a one‐dimensional aeronomy model. The calculations account for the important chemical reactions and use rocket measurements of the solar flux at solar minimum and maximum. Photodissociation rates appropriate for the mesosphere are determined with a spherical shell atmosphere formalism; detailed corrections for the O2Schumann‐Runge bands and the temperature dependence of the CO2cross sections are used. Then an eddy diffusion profile is derived which gives agreement with the Aladdin 74 mass spectral measurements of atomic O, O2, CO2, and Ar in the lower thermosphere and observations of the O3minimum at ∼80 km. The 115 GHz CO radio emission line computed for the CO mixing ratio profile predicted with the new eddy diffusion profile compares well with recent observations of W. J. Wilson. Differences between the calculated CO mixing ratio profile and previous theoretical and observational determinations are discussed. Our derived eddy diffusion profile has a sudden decrease at 92 km which is necessary to produce the atomic O peak at 98 km that appears in the Aladdin 74 measurements. This stagnant region apparently is a recurrent or persistent feature of the upper atmosphere since an atomic O peak around 98 km has been seen by different techniques in different seasons over several years. Slow eddy diffusion in the lower thermosphere through the homopause was also the conclusion of earlier Ar/N2rocket measurements studies. The analytic approach of this paper could be used in the future to monitor variations in middle atmosphere dynamics, if regularly conducted simultaneous observations of various groups of species were available.