On the role of viscosity in ideal Hadley circulation models
On the role of viscosity in ideal Hadley circulation models
复制标题
理想哈德利环流模型中粘度的作用
DOI：
10.1029/2010gl043745
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发表时间：
2010
影响因子：
5.2
通讯作者：
N. Paldor
中科院分区：
文献类型：
--
作者：
Ori Adam;N. Paldor
比较无粘和粘性解决方案的轴对称非线性浅水模型（SWM）的Hadley环流的球形旋转地球，包括动量和瑞利摩擦的垂直平流。一维SWM的结果与二维（纬度高度）非线性轴对称模式的结果进行了比较。结果表明，从无粘模式得到的解决方案不正确预测的主要特征外的热带环流。具体来说，副热带急流的纬度强烈依赖于粘度和极赤道温差。与无粘理论的差异归因于在粘性大气中能量耗散率的增加。而在热带，SWM的无粘解能较好地预测东风急流的纬度和强度以及较弱的温度梯度。
A comparison is made between inviscid and viscous solutions of an axially symmetric nonlinear Shallow Water Model (SWM) of the Hadley circulation on the spherical rotating Earth that includes vertical advection of momentum and Rayleigh friction. The results of the 1D SWM are compared with those of 2D (latitude‐height) nonlinear axially symmetric models. It is shown that solutions obtained from inviscid models do not predict correctly the main features of the circulation outside the Tropics. Specifically, the latitudes of the subtropical jets depend strongly on viscosity and on the pole‐to‐equator temperature difference. The differences from inviscid theory are attributed to the increased rate of energy dissipation in the viscous atmosphere. At the Tropics, however, the inviscid solutions of the SWM predict well the latitude and strength of the easterly jet and the weak temperature gradient.