Temperature and circulation in the stratosphere of the outer planets
Temperature and circulation in the stratosphere of the outer planets
复制标题
外行星平流层的温度和环流
DOI：
10.1016/0019-1035(90)90068-k
复制
发表时间：
1990
期刊：
影响因子：
3.2
通讯作者：
S. Leroy
中科院分区：
文献类型：
--
作者：
B. Conrath;P. Gierasch;S. Leroy
将区域对称的线性辐射动力学模型与外行星对流层上部和平流层的观测进行比较。模型中包含季节变化。摩擦力通过线性阻力（瑞利摩擦力）进行参数化。考虑了气体不透明度，但忽略了气溶胶。所有行星的水平温度梯度都很小。季节性影响对土星和海王星最强，但即使在这些情况下也很弱，因为辐射加热的纬度梯度很弱。对天王星的季节性影响非常弱，因为辐射时间常数比轨道周期长。模型中的一个自由参数是摩擦时间常数。在这个简单模型的背景下，与对流层纬向流观测到的温度扰动进行比较表明，摩擦时间常数与所有这些行星的辐射时间常数处于同一数量级。最后，模型预测的垂直运动极其微弱。除了紧邻对流层纬向流之外，它们比每个轨道周期的一个尺度高度小得多。
A zonally symmetric, linear radiative-dynamical model is compared with observations of the upper tropospheres and stratospheres of the outer planets. Seasonal variation is included in the model. Friction is parameterized by linear drag (Rayleigh friction). Gas opacities are accounted for but aerosols are omitted. Horizontal temperature gradients are small on all the planets. Seasonal effects are strongest on Saturn and Neptune but are weak even in these cases, because the latitudinal gradient of radiative heating is weak Seasonal effects on Uranus are extremely weak because the radiative time constant is longer than the orbital period. The one free parameter in the model is the frictional time constant. Within the context of this simple model, comparison with observed temperature perturbations over zonal currents in the troposphere shows that the frictional time constant is on the same order as the radiative time constant for all these planets. Finally, vertical motions predicted by the model are extremely weak. They are much smaller than one scale height per orbital period, except in the immediate neighborhood of tropospheric zonal currents.