The mesoscale balance and imbalance and the corresponding potential vorticity inversion from the view of helicity
The mesoscale balance and imbalance and the corresponding potential vorticity inversion from the view of helicity
复制标题
螺旋度视角下的中尺度平衡与不平衡及相应的位涡反演
DOI：
10.1007/s13351-016-5115-1
复制
发表时间：
2016-07
影响因子：
3.2
通讯作者：
Zuo Qunjie
中科院分区：
文献类型：
--
作者：
Gao Shouting;Zhou Feifan;Zuo Qunjie
静平衡和地转平衡是气象学中常见的平衡。所有天气系统和大部分中尺度系统都满足上述两个平衡。然而，由于强对流和非地转特征，许多介尺度系统通常表现为静态不平衡，不再能够实现准地转近似。本文试图找出中尺度对流系统存在的一种平衡。为此，定义了平衡和不平衡方程的具体数学定义。然后，提出新的平衡方程应同时包含散度、涡度和垂直运动，而螺旋度方程是一个很好的基础选择。最后，构建了介尺度平衡和不平衡方程，以及基于相同近似下的螺旋度、水平散度、垂直涡度、连续性和热动力方程的新平衡模型。此外，还介绍了相应的位涡（PV）反演技术。指出利用PV守恒和位温守恒，可以推导出介尺度平衡模型的流动，并与实际场进行比较，从而给出不平衡的程度。
The static balance and the geostrophic balance are the common balances in meteorology. All the synoptic systems and most of the mesoscale systems satisfy the above two balances. However, due to the strong convection and non-geostrophic feature, many mesoscale systems usually present as static imbalance, and the quasi-geostrophic approximation is no longer attainable. This paper tried to find out a kind of balance that exists for mesoscale convective system. To do this, the concrete mathematics definitions for balance and imbalance equations were defined. Then, it is proposed that the new balance equation should include the divergence, vorticity, and vertical motion simultaneously, and the helicity equation was a good choice for the basis. Finally, the mesoscale balance and imbalance equations were constructed, as well as a new balance model that was based on the helicity, horizontal divergence, vertical vorticity, continuity, and thermal dynamic equations under same approximations. Moreover, the corresponding potential vorticity (PV) inversion technique was introduced. It was pointed out that by using the PV conservation and the potential temperature conservation, the flows of the mesoscale balance model can be deduced, and their comparison with the real fields would give the degree of the imbalance.
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