potential vorticity वाक्य
उदाहरण वाक्य
मोबाइल
- In the lowest level of the stratosphere, strong potential vorticity gradients remain, and the majority of that air remains confined within the polar air mass into December in the Southern Hemisphere and April in the Northern Hemisphere, well after the breakup of the vortex in the mid-stratosphere.
- The absolute vorticity of an air mass will change if the air mass is stretched ( or compressed ) in the " z " direction, but the potential vorticity is tracer of air masses over the timescale of a few days, particularly when viewed on levels of constant entropy.
- Where ? denotes the streamfunction ( which can be used to derive all other variables from quasi-geostrophic theory ), z denotes altitude, y denotes latitude, q denotes the quasi-geostrophic potential vorticity, \ overline U denotes the mean shear, and H denotes the tropopause height.
- It is formed with the aid of potential vorticity, which is defined as the product of the isentropic density, i . e . the density that arises from using potential temperature as the vertical coordinate, and the absolute vorticity, given that this quantity attains quite different values for the troposphere and the stratosphere.
- Thus, the phase and group speeds are equal in magnitude but opposite in direction ( phase speed is westward and group velocity is eastward ); note that is often useful to use potential vorticity as a tracer for these planetary waves, due to its invertibility ( especially in the quasi-geostrophic framework ).
- Considering a parcel of air that has no relative vorticity before perturbation ( uniform " U " has no vorticity ) but with planetary vorticity " f " as a function of the latitude, perturbation will lead to a slight change of latitude, so the perturbed relative vorticity must change in order to conserve potential vorticity.
- Because of conservation of potential vorticity caused by the northward-moving winds on the subtropical ridge's western periphery and the increased relative vorticity of northward moving water, transport is balanced by a narrow, accelerating poleward current, which flows along the western boundary of the ocean basin, outweighing the effects of friction with the western boundary current known as the Labrador current.
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