Sentences with phrase «polar front»

These changes in atmospheric circulation are predominantly observed as «annular modes», related to the zonally averaged mid-latitude westerlies, which strengthened in most seasons from the 1960s to at least the mid-1990s, with poleward displacements of corresponding Atlantic and southern polar front jet streams and enhanced storm tracks.

Stronger mid-latitude westerly wind maxima have occurred in both hemispheres in most seasons from at least 1979 to the late 1990s, and poleward displacements of corresponding Atlantic and southern polar front jet streams have been documented.

Cooling in the of the stratosphere during low solar activity increases surface level pressure at the poles — that pushes polar fronts into lower latitudes.

This in turn is probably a major reason for the projected northward shift of the polar front (and storm tracks) and the northward extension of the Hadley cell (and thus the Subtropics).

Hurricanes have no fronts associated with them like the mid-latitude cyclones of the polar front.

Since cold air is more dense, atmospheric pressure decreases more rapidly with height on the poleward side of the polar front than on the warmer tropical side.

When polar air neither retreats nor advances, the polar front is called a stationary front.

In the troposphere, the demarcation between polar air and warmer tropical atmosphere is usually defined by the polar front.

These phenomena develop along the polar front, which separates colder polar air from warmer tropical air, when sufficiently large temperature differences occur across the frontal boundary in the lower troposphere.

Clouds and often precipitation occur on the poleward sides of both warm and stationary fronts and whenever tropical air reaching the latitude of the polar front is forced upward over the colder air near the surface.

The position of the polar front slopes upward toward colder air.

During the winter season, the polar front is generally located at lower latitudes and is more pronounced than in the summer.

Ozone is also transported downward into the troposphere, primarily in the vicinity of the polar front.

Jet streams are relatively narrow corridors of particularly strong winds, which correspond to the location of the polar front and other areas of strong temperature contrast.

The zone of convergence, or polar front, is most strongly developed in winter, when the contrast in temperature and humidity of the air between the converging flows is greatest.

This would be a process driven by ozone warming and cooling from solar UV drift feeding into the polar fronts.

so, the upper ocean heat content is increasing and the polar front is getting more turbulent.