论文标题
在热加热的热型全球大气上重复的环球发生
Repeated Cyclogenesis on Hot-Exoplanet Atmospheres with Deep Heating
论文作者
论文摘要
当前的热型型大气模型都假设浅加热，这是大气顶部附近的强烈的昼夜差分加热。在这里，我们研究了潮汐锁定气体巨型外球星模型中能量沉积在不同深度的影响。我们对代表浅水和深加热的理想化热加热强制进行热外行星大气的高分辨率大气流模拟（即分别以$ \ sim 10^3 $ pa和$ \ sim 10^5 $ pa压力水平强烈沉积在$ \ sim 10^3 $ pa和$ \ sim 10^3 $ pa上）。与浅加热不同，带有深加热的流动表现出一种新的动态平衡状态，其特征是反复产生曾经形成的巨型旋风风暴，它们一旦形成向西移动。该地层伴随着湍流的爆发，导致在$ \ sim 3 $行星旋转的时间尺度上产生小规模的流量结构和温度大规模混合。值得注意的是，尽管不包括可能很重要的效果（例如，偶联的辐射通量和对流激发重力波）不包括在数百天的时间范围内，但模拟鲁棒地表明，新兴的热量磁通很大程度上取决于加热类型，并且可以通过电流观测值区分。
Most current models of hot-exoplanet atmospheres assume shallow heating, a strong day-night differential heating near the top of the atmosphere. Here we investigate the effects of energy deposition at differing depths in a model tidally locked gas-giant exoplanet. We perform high-resolution atmospheric flow simulations of hot-exoplanet atmospheres forced with idealized thermal heating representative of shallow and deep heating (i.e., stellar irradiation strongly deposited at $\sim 10^3$ Pa and $\sim 10^5$ Pa pressure levels, respectively). Unlike with shallow heating, the flow with deep heating exhibits a new dynamic equilibrium state, characterized by repeated generation of giant cyclonic storms that move away westward once formed. The formation is accompanied by a burst of heightened turbulence, leading to the production of small-scale flow structures and large-scale mixing of temperature on a timescale of $\sim 3$ planetary rotations. Significantly, while effects that could be important (e.g., coupled radiative flux and convectively excited gravity waves) are not included, over a timescale of several hundred days the simulations robustly show that the emergent thermal flux depends strongly on the heating type and is distinguishable by current observations.
