论文标题
金星下部云层长期急剧破坏
A Long-lived Sharp Disruption on the Lower Clouds of Venus
论文作者
论文摘要
人们认为，行星尺度波在为金星的大气跨度驱动方面发挥了作用。令人困惑的是，开尔文，罗斯比和固定波在上云（65--70 km）上表现出来，但在下部云的间隔水平（48--55 km）中，没有据报道过行星尺度的波浪或固定图案，尽管后者可能是Lee Wave。利用Akatsuki轨道和地面望远镜的观察结果，我们表明，较低的云遵循的常规周期在30 $^{\ circ} $ n--40 $^{\ circ} $ s之间，通过急剧的不连续性或破坏了维纳斯的一般循环和热结构。这种破坏的向西轮换期在$ \ sim $ 4.9天的$ 4.9天（$ \ sim $ 6天），改变了云的属性和气溶胶，并且在几周内保持连贯。过去的观察表明，至少自1983年以来，其复发性质，数值模拟表明，非线性开尔文波再现其许多特性。
Planetary-scale waves are thought to play a role in powering the yet-unexplained atmospheric superrotation of Venus. Puzzlingly, while Kelvin, Rossby and stationary waves manifest at the upper clouds (65--70 km), no planetary-scale waves or stationary patterns have been reported in the intervening level of the lower clouds (48--55 km), although the latter are probably Lee waves. Using observations by the Akatsuki orbiter and ground-based telescopes, we show that the lower clouds follow a regular cycle punctuated between 30$^{\circ}$N--40$^{\circ}$S by a sharp discontinuity or disruption with potential implications to Venus's general circulation and thermal structure. This disruption exhibits a westward rotation period of $\sim$4.9 days faster than winds at this level ($\sim$6-day period), alters clouds' properties and aerosols, and remains coherent during weeks. Past observations reveal its recurrent nature since at least 1983, and numerical simulations show that a nonlinear Kelvin wave reproduces many of its properties.
