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  • Potential vorticity - Wikipedia
    In fluid mechanics, potential vorticity (PV) is a quantity which is proportional to the dot product of vorticity and stratification This quantity, following a parcel of air or water, can only be changed by diabatic or frictional processes
  • 位涡-Potential vorticity | Ran Xue - GitHub Pages
    Potential vorticity (PV) is the atmosphere's best equivalent to a dye in water, and therefore can be used to analyse and track shortwaves aloft (and the frontal disturbances associated with it) It can also be used to explain how a range of mountains like the Andes makes the upper westerly winds swerve towards the equator and back
  • Potential Vorticity - GitHub Pages
    Rossby于1930s年代提出位涡的想法，是希望得到一个 与垂直涡度相关的、类似于位温一样 的守恒量。 这里的“垂直”是指垂直于分层界面。 这一想法是具有重要而深远的意义的。 因为这一概念不仅适用于地球上的大气和海洋，也适用于太阳这一类恒星的辐射内部。 它对于理解平衡流以及一系列基本的动力过程都很重要，例如Rossby波的传播与破碎及其对大气的影响、全球尺度的遥相关、急流self-sharpening等的反摩擦现象、气旋反气旋和风暴路径的生成、风的形成等等。 感觉位涡可以理解为等熵面间单位质量的涡度 位涡是一个标量，是一个综合 表征大气运动状态和热力状态 的物理量，它的重要性在于 绝热无摩擦运动中微团的位涡守恒，位涡守恒定理揭示了涡度变化是受到大气热力结构制约的。
  • 位势涡度 - 百度百科
    potential vorticity 定 义 两邻近等熵面(等位温面)之间的大气柱在被带到某一规定纬度并被伸缩到某一规定厚度时所有的涡度。其实质是绝对涡度的垂直分量(ζ+f )与涡旋的有效厚度(即两位温面θ和θ+Δθ之间以单位气压为度量的距离) 之比。 应用学科
  • Vorticity, Circulation and Potential Vorticity
    3 Vorticity, Circulation and Potential Vorticity 3 1 Definitions • Vorticity is a measure of the local spin of a fluid element given by ω~ = ∇×~v (1) So, if the flow is two dimensional the vorticity will be a vector in the direction perpendicular to the flow • Divergence is the divergence of the velocity field given by D = ∇ ~v (2)
  • 位涡理论及其应用 - qxqk. nmc. cn
    Potential vorticity (PV) is one of the important concepts in advanced synoptic and dynamic meteorology This paper is a brief introduction to the theory of potential vorticity, including the concept of PV, the conservation and invertibility of PV, PV thinking, moist PV (MPV), and the application of PV theory
  • POTENTIAL VORTICITY - Colorado State University
    Definition and characteristics of Potential Vorticity The potential vorticity (PV) is the absolute circulation of an air parcel that is enclosed between two isentropic surfaces If PV is displayed on a surface of constant potential temperature, then it is officially called IPV (isentropic potential vorticity)
  • (Potential) vorticity: the swirling motion of geophysical fluids
    To understand the role of vortices in geophysical fluids, vorticity and, in particular, potential vorticity are key quantities of the flow In a 3D flow, vorticity is a 3D vector field with as complicated dynamics as the flow itself In this lecture, we focus on 2D flow, so that vorticity reduces to a scalar field
  • chapter 3 POTENTIAL VORTICITY THINKING AND ROSSBY WAVE DYNAMICS
    QGPV（准地转势涡度）的守恒方程可以通过Ertel PV的物质守恒直接推导出来。 Ertel PV的定义为： 其中， ρ 为密度， ζ 为涡度， ∇θ 为位温的梯度。 根据Hoskins和James（2014）中的完整三维流动理论（第12 4节），这一守恒方程可以表示为： 这一式子中，应用了准地转（QG）尺度假设，即 F r ∼ Ro ≪ 1，并保留了一阶近似项。 这里的关键区别在于： 1 QGPV的守恒：在每一高度（或压力坐标系下的压力面）上，QGPV遵循水平流动的守恒。 2 Ertel PV的守恒：Ertel PV在完整的三维流动中（如果是绝热的，则沿等位温面）守恒。 在QGPV方程（ DtDgq = 0）中，输运速度也被近似为地转风（这一点与 Ro ≪ 1 假设一致）。
  • A brief introduction to potential vorticity with no equations
    Having a specific definition for potential vorticity allows us to quantify this association and understand the exact relationship between column height and rate of rotation This is the “potential” part of potential vorticity: the wider the column, the more potential to increase vorticity if the column is stretched





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