Solar-locked and geographical atmospheric structures inferred from a Venus general circulation model with radiative transfer
Solar-locked and geographical atmospheric structures inferred from a Venus general circulation model with radiative transfer
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从具有辐射传输的金星大气环流模型推断出的太阳锁定和地理大气结构
DOI：
10.1016/j.icarus.2018.11.015
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发表时间：
2019
期刊：
影响因子：
3.2
通讯作者：
Takeshi Horinouchi
中科院分区：
文献类型：
--
作者：
Masaru Yamamoto;Kohei Ikeda;Masaaki Takahashi;Takeshi Horinouchi
利用金星地形和双流辐射码的大气环流模式研究了金星日平均风和温度的太阳锁定和地理大气结构，并与赤月紫外线成像仪获得的风场进行了比较。模拟的亚太阳区周围的水平风场与观测到的云顶风场相似。在云顶周围形成了约120 m s - 1的中纬度急流和约90 m s - 1的赤道快速气流。在太阳加热强烈的云层上方，形成了一个向极地方向流动的bbb80 m s - 1。在云顶周围，一个极向流（~ 1 m s - 1）被限制在喷流核心的赤道侧翼内，而由热潮和斜压波引起的涡旋热通量在喷流核心内形成了一个间接环流。在太阳固定坐标下，亚太阳-反太阳环流在云顶周围占主导地位。因此，经向风及其在云层内的相关通量的纬向平均值和日侧平均值之间的差异是显著的。这表明哈德利环流的纬向平均经向风、涡旋动量和来自单侧半球的热通量必须仔细估计。在包括地形在内的实验中，高原和山区的纬向带形成近地面亚旋转，低纬度10-20 km处形成弱稳定层，阿芙罗狄蒂Terra云顶的纬向风减弱。由地形波引起的大气结构的区域静止改变出现在云层中。
Solar-locked and geographical atmospheric structures of daily averaged wind and temperature on Venus were investigated using an atmospheric general circulation model with Venusian topography and a two-stream radiative code and were compared with wind fields obtained from the Akatsuki ultraviolet imager. The horizontal wind fields simulated around the subsolar region are similar to the observed ones at the cloud top. Mid-latitude jets of ∼120 m s–1and an equatorial fast flow of ∼90 m s–1are formed around the cloud top. A poleward flow of >8 m s–1is formed above the cloud layer, where solar heating is strong. Around the cloud top, a poleward flow of ∼1 m s–1is confined within the equatorward flank of the jet core, whereas an indirect circulation is formed in the jet core by the eddy heat fluxes owing to the thermal tide and baroclinic waves. In solar-fixed coordinates, the subsolar-to-antisolar circulation is predominant around the cloud top. Thus, differences are significant between the zonal and dayside averages of the meridional wind and its related fluxes within the cloud layer. This suggests the zonal mean meridional wind of the Hadley circulation, eddy momentum, and heat fluxes from the one-side hemisphere must be estimated carefully. In the experiment including topography, a near-surface subrotation is formed in latitudinal zones over high land and mountains, a weakly stable layer is formed at 10–20 km at low latitudes, and the zonal wind is weakened at the cloud top over the Aphrodite Terra. Regional stationary modification of the atmospheric structure due to topographical waves appears in the cloud layer.