论文标题
金星云中的充值振荡器模型
A Recharge Oscillator Model for Interannual Variability in Venus' Clouds
论文作者
论文摘要
二氧化硫是金星大气中一种辐射且具有化学重要性的痕量气体，并且已经观察到在年际与十年时间尺度上的云罐中的丰度变化。人们认为，这种变异性来自对流的强度的变化，将二氧化硫传递到云端，{{{}这种对流变异性背后的动力学尚不清楚。在这里，我们提出了一种新的概念模型，用于对流变异性，该模型将水丰度的辐射影响与云中的对流强度联系起来，这又影响了云中的水传输。该模型由两个耦合方程组成，这些方程式被识别为充电驱动器振荡器。耦合方程式的解决方案是在3 - 9年的时间尺度上持续的对流强度和云基水丰度的有限振幅。特征振荡时间尺度由辐射冷却时间的几何平均值和对流云底部附近的涡流混合时间给出。
Sulfur dioxide is a radiatively and chemically important trace gas in the atmosphere of Venus and its abundance at the cloud-tops has been observed to vary on interannual to decadal timescales. This variability is thought to come from changes in the strength of convection which transports sulfur dioxide to the cloud-tops, {although} the dynamics behind such convective variability are unknown. Here we propose a new conceptual model for convective variability that links the radiative effects of water abundance at the cloud-base to convective strength within the clouds, which in turn affects water transport within the cloud. The model consists of two coupled equations which are identified as a recharge-discharge oscillator. The solutions of the coupled equations are finite amplitude sustained oscillations in convective strength and cloud-base water abundance on 3-9 year timescales. The characteristic oscillation timescale is given by the geometric mean of the radiative cooling time and the eddy mixing time near the base of the convective clouds.
