On weather maps, these areas show converging winds ( hPa pressure surface about midway up through the troposphere, and about half the atmospheric pressure at the surface.
12.
Later models substituted the geometric z coordinate with a pressure coordinate system, in which the geopotential heights of constant-pressure surfaces become dependent variables, greatly simplifying the primitive equations.
13.
The pressure surfaces are lifted aloft over land but not over the sea, since the surface temperature of the sea responds only very weakly to the daily cycle of light and dark.
14.
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.
15.
After 1200 UTC September 12, the low moved southeastward and became vertically stacked from the surface up to the 500 millibar pressure surface ( located 18, 000 ft above mean sea level ).
16.
Since the atmosphere at a height of approximately is mostly divergence-free, the barotropic model best approximates the state of the atmosphere at a geopotential height corresponding to that altitude, which corresponds to the atmosphere's pressure surface.
17.
On weather maps, these areas show converging winds ( isotachs ), also known as confluence, or converging height lines near or above the level of non-divergence, which is near the 500 hPa pressure surface about midway up through the troposphere.
18.
It can be shown from the momentum equation that vertical pressure gradients are nearly hydrostatic, and that horizontal pressure gradients are due to the displacement of the pressure surface, implying that the horizontal velocity field is constant throughout the depth of the fluid.
19.
Those pressures surfaced Tuesday in a closed-door meeting at Arafat's seaside offices, where leaders of the PLO began discussions on the inflammatory question of whether Arafat should declare statehood on May 4, or accede to U . S . requests to delay the announcement and settle for accelerated peace talks with Israel.
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