Dynamical Effect on Static Stability of the Venus Atmosphere Simulated Using a General Circulation Model: A Comparison With Radio Occultation Measurements
Dynamical Effect on Static Stability of the Venus Atmosphere Simulated Using a General Circulation Model: A Comparison With Radio Occultation Measurements
复制标题
使用一般环流模型模拟的金星大气静态稳定性的动态影响：与射电掩星测量的比较
DOI：
10.1029/2021je006957
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Maria Antonita
中科院分区：
文献类型：
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作者：
Hiroki Ando;Koutarou Takaya;Masahiro Takagi;Norihiko Sugimoto;Takeshi Imamura;Hideo Sagawa;Silvia Tellmann;Martin Patzold;Yoshihisa Matsuda;Bernd Hausler;Sanjay Limaye;Raj Kumar Choudhary;Maria Antonita
金星大气中的温度和静态稳定度的分布与最近的无线电掩星测量是一致的再现使用的大气环流模式。低稳定性层维持在低纬度和中纬度50-60 km的高度，并分别夹在60 km以上和50 km以下的高稳定性层和中等稳定性层之间。在极地地区，低稳定层位于46-63 km高度，相对低稳定层也位于40-46 km高度。为了研究这些热结构是如何形成的，我们研究了65公里高度以下的大气运动对静稳定性的动力学影响。结果表明，由于平均纬向环流和扰动引起的热量输送在低纬地区是重要的。47公里以上的中高纬度地区受辐射过程的影响而不稳定，受扰动的影响而稳定，这些扰动主要与斜压Rossby型波有关。在47公里以下，极地地区由于动力学过程而不稳定，这些动力学过程诱导了明显的向赤道的热输送，这可能与云下地区的罗斯贝波有关，尽管在云高处对流调整的抑制导致了43-47公里的稳定。
Distributions of temperature and static stability in the Venus atmosphere consistent with recent radio occultation measurements are reproduced using a general circulation model. A low‐stability layer is maintained at low‐ and mid‐latitudes at 50–60 km altitude and is sandwiched by high‐ and moderate‐stability layers extending above 60 and below 50 km, respectively. In the polar region, the low‐stability layer is located at 46–63 km altitude and the relatively low‐stability layer is also found at 40–46 km altitude. To investigate how these thermal structures form, we examine the dynamical effects of the atmospheric motions on the static stability below 65 km altitude. The results show that the heat transports due to the mean meridional circulation and disturbances are important in low‐latitudes. The mid‐ and high‐latitudes above ∼47 km are destabilized by radiative processes and stabilized by the disturbances, which are mainly associated with baroclinic Rossby‐type waves. Below ∼47 km altitude, the polar region is destabilized by the dynamical processes which induce the appreciable equatorward heat transport, which might be related to Rossby waves in the sub‐cloud region, although the suppression of convective adjustment at cloud heights leads to stabilization at 43–47 km.