Circulation and Tides in a Cooler Upper Atmosphere: Dynamical Effects of CO 2 Doubling
Circulation and Tides in a Cooler Upper Atmosphere: Dynamical Effects of CO 2 Doubling
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较冷高层大气中的环流和潮汐：CO 2 倍增的动力学效应
DOI：
10.1029/2020gl087413
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发表时间：
2020
影响因子：
5.2
通讯作者：
Nakamoto Yusuke
中科院分区：
文献类型：
--
作者：
Liu Huixin;Tao Chihiro;Jin Hidekatsu;Nakamoto Yusuke
热层冷却是大气中二氧化碳增加的一个已知效应。在这项研究中，我们探索的热层环流和潮汐的变化，在冷却的热层通过一个双重的CO2数值试验使用的地面到顶部大气电离层模式高层大气（GAIA）。结果显示了三个主要特征。(1)至点附近的热层比春分点附近的热层冷却大约10 K，在夏季极点比冬季极点冷却更多。(2)纬向环流向下移动，并以5-15 m s−1的速度大幅加速。(3)潮汐活动经历了戏剧性的变化，在整个热层的半日潮（SW 2）减少40-60%，但在200公里高度以下的全日潮（DW 1）增强30-50%。非迁移潮DE 3只有微小的变化。这些温度，纬向环流和潮汐的变化是在所有季节的持续功能，可以深刻地影响空间分布和电离层响应CO2倍增通过大气成分和电动力学的日周期。
Thermosphere cooling is a known effect of increasing CO2in the atmosphere. In this study, we explore the changes of thermosphere circulation and tides in the cooled thermosphere via a doubled CO2numerical experiment using the Ground‐to‐topside Atmosphere Ionosphere model for Aeronomy (GAIA). The results reveal three major features. (1) The thermosphere cools about 10 K more around solstices than equinoxes, more at the summer pole than the winter pole. (2) The meridional circulation shifts downward and strongly accelerates by 5–15 m s−1. (3) The tidal activity experiences dramatic changes, with a 40–60% reduction in the semidiurnal tides (SW2) throughout the thermosphere but an 30–50% enhancement in diurnal tides (DW1) below 200 km altitude. The nonmigrating tide DE3 has only minor changes. These changes in temperature, meridional circulation, and tides are persistent features in all seasons and can profoundly affect the spatial distribution and diurnal cycles of the ionospheric responses to CO2doubling via atmosphere composition and electrodynamics.