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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the Effects of Mesospheric and Lower Thermospheric Oxygen Chemistry on the Thermosphere and Ionosphere Semiannual Oscillation
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On the Effects of Mesospheric and Lower Thermospheric Oxygen Chemistry on the Thermosphere and Ionosphere Semiannual Oscillation

机译：在中间层和较低的影响Thermospheric氧气的化学热大气层、电离层半年振荡

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摘要

This study quantifies mesosphere/lower thermosphere (MLT) oxygen chemical contributions to the global thermosphere-ionosphere (T-I) semiannual oscillation (SAO) using a series of numerical experiments from the National Center for Atmospheric Research (NCAR) thermosphereionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM) that isolate essential chemical processes affecting O and O_2 in the MLT region. We track the vertical dynamical, diffusive, and chemical fluxes of O and O_2 in and out of two control volumes between ~80 and 130 km using a finite volume approach to the individual species continuity equation to investigate their relative importance on the global T-I SAO. TIME-GCM results indicate that the global T-I SAO amplitude and phase is fairly insensitive to significant changes in odd oxygen chemical reaction rates in the MLT. While chemistry has an appreciable effect on O in the MLT region, sensitivity to changes in odd oxygen and odd hydrogen chemical rates appear to be offset by a consequent adjustment in the vertical bulk wind and eddy diffusive transport of O locally, rendering their effects inconsequential to the global T-I SAO aloft. The implications of our findings for reproducing a self-consistent global T-I SAO in the NCAR thermosphereionosphere-electrodynamics general circulation model (TIE-GCM) with a lower boundary near ~100 km are discussed. Specifically, including latitude-season variations in O, O_2, and N_2 from NRLMSIS? 2.0 at the lower boundary of the TIE-GCM near ~100 km improves its representation of the climatological T-I SAO. However, reformulating the TIE-GCM temperature lower boundary condition could further improve its ability to simulate the T-I SAO from first-principles.
机译：本研究量化中间层/低热电离层(MLT)氧气化学的贡献全球thermosphere-ionosphere(我)使用一系列的半年一次的振荡(SAO)从国家中心数值实验大气研究中心(NCAR)thermosphereionosphere-mesosphere-electrodynamics大气环流模式(TIME-GCM)隔离基本化学过程影响O和成分在匝的地区。动力、扩散和化学通量O和提取成分的两个控制量之间~ 80和130公里使用有限体积方法个别物种的连续性方程调查他们的相对重要性全球我圣。全球我圣振幅和相位相当对奇怪的氧气将发生重大变革化学反应速率传输。在O化学有着明显的影响MLT地区,灵敏度变化奇怪的氧气似乎和奇怪的化学氢率随之调整垂直所抵消大部分风和涡流扩散运输O在本地,使他们的影响无关紧要全球我圣在空中。我们的发现复制自洽全球在NCAR我圣thermosphereionosphere-electrodynamics一般循环模型(TIE-GCM)较低的边界~ 100公里附近进行了讨论。包括latitude-season O的差异,提取成分,和甲烷NRLMSIS吗?提高了附近的TIE-GCM ~ 100公里表示的气候我圣。然而,申论TIE-GCM温度较低的边界条件可能会进一步提高其模拟的我圣的能力采用基于。

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