isobar oor Noorweegse Nynorsk
isobar
en
(meteorology) A line drawn on a map or chart connecting places of equal or constant pressure.
Vertalings in die woordeboek Engels - Noorweegse Nynorsk
isobar
Geskatte vertalings
Vertoon algoritmies gegenereerde vertalings
Prenteboek
voorbeelde
Advanced filtering
Voorbeelde moet herlaai word.
Isobars are nuclides having the same mass number, i. e. sum of protons plus neutrons
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These two forces are opposite but not equal, and the path that results when the two forces cancel each other runs parallel to the isobars. Wind following this path is known as geostrophic wind. Winds are said to be truly geostrophic only when other forces (e.g. friction) acting on the air are negligible, a situation which is often a good approximation to the large-scale flow away from the tropics.
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As a result, the wind direction near ground level is partly parallel to the isobars in the region, and partly across the isobars in the direction from higher pressure to lower pressure.
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As density is related to temperature, on a surface map, isobars and isotherms cross too
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However, from ground level up to heights where the influence of the earth’s surface can be neglected, the wind speed is less than predicted by the barometric pressure gradient, and the wind direction is partly across the isobars rather than parallel to them.
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Examples are: geostrophic wind (wind that is a result of the balance between Coriolis force and pressure gradient force; flows parallel to isobars and approximates the flow above the atmospheric boundary layer in the midlatitudes if frictional effects are low)
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Measurements of wind speed and direction at heights well above ground level confirm that the speed of the wind matches that predicted by considerations of gradient flow, and the direction of the wind is indeed parallel to the isobars in the region.
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The deflection increases until the Coriolis and pressure gradient forces are in geostrophic balance: at this point, the air flow is no longer moving from high to low pressure, but instead moves along an isobar.
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In meteorology, a barotropic atmosphere is one that for which the density of the air depends only on pressure, as a result isobaric surfaces (constant-pressure surfaces) are also constant-density surfaces.
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Such isobaric surfaces will also be isothermal surfaces, hence (from the thermal wind equation) the geostrophic wind will not vary with depth.
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In a region of high pressure (an anticyclone) the secondary flow includes a slow, widespread descent of air from mid altitudes toward ground level, and then outward across the isobars.
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Above the PBL is the "free atmosphere" where the wind is approximately geostrophic (parallel to the isobars) while within the PBL the wind is affected by surface drag and turns across the isobars.
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The primary flow around a tropical cyclone is parallel to the isobars – and hence circular.
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If they are not marked, troughs may still be identified as an extension of isobars away from a low pressure center.
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The basic principles of physics and the Coriolis effect satisfactorily explain that the direction of the wind in the atmosphere is parallel to the isobars.
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It does not conform to the primary flow, which is parallel to the isobars.
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