Sentences with word «poleward»

Without continents, you might not get any western boundary currents, which could alter the balance of poleward heat transport and really affect the general circulation of the atmosphere.

Extratropical cyclones have three stages of expansion: the developing stage, in which an undulating wave develops along the front; the mature stage, in which sinking cold air sweeps equatorward west of the surface low - pressure centre and ascending warm air moves poleward east of the cyclone; and the occluded stage, in which the warm air is entrained within and moved above the polar air and becomes separated from the source region of the tropical air.

This trend of poleward migration is evident in all ocean basins, except the North Indian Ocean basin, in homogenized satellite and so - called «best track» data.

Therefore, the decreased temperature gradient can be explained in part by increased poleward heat transport, but other physical mechanisms must be invoked to explain the observed asymmetry in the latitudinal temperature gradient.

«If you find wet get wetter, dry get drier, occurring increasingly in tandem with poleward expansion, there's just almost no way that can happen naturally,» Marvel said.

An important one is additional poleward energy transport, but contributions from local high - latitude water vapour, cloud and temperature feedbacks have also been found.

Widening of the tropics would also probably be associated with poleward movement of major extratropical climate zones due to changes in the position of jet streams, storm tracks, mean position of high and low pressure systems, and associated precipitation regimes.

More than 30 studies confirm that the tropics are expanding poleward as Earth warms, the report notes.

A parcel of air picking up water vapor at (near) the ITCZ moves poleward as well as rising.

Thermohaline circulation also drives warmer surface waters poleward from the subtropics, which moderates the climate of Iceland and other coastal areas of Europe.

The net effect for biodiversity of these habitat expansions and contractions is not obvious, particularly as species ranges may shift poleward from the tropics, where the greatest number of species is currently.

«Fish moving poleward at rate of 26 kilometers per decade.»

«We estimate that the jet streams in both hemispheres have shifted poleward by roughly 1 degree latitude in both summer and winter seasons,» the researchers, led by Qiang Fu of the University of Washington, write in today's Science.

Enhanced Arctic warming reduces poleward temperature gradient Weaker gradient affects waves in upper - level flow in two observable ways Both effects slow weather patterns, favoring extreme weather

Observed and simulated cloud change patterns are consistent with poleward retreat of mid-latitude storm tracks, expansion of subtropical dry zones, and increasing height of the highest cloud tops at all latitudes.

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.

So one can rationalize the result that the centers of action for internal variability in the oceans migrate poleward from the tropics and subtropics to higher latitudes as one moves to lower frequencies.

«You have sort of this tug - of - war between the jet being pulled equatorward during the summer because of the ozone recovery and the greenhouse gases pulling the jet further poleward,» Grise said.

Many insects, plants, and marine creatures are rapidly shifting their ranges poleward.

Their abstract says «energy budget calculations show that poleward atmospheric energy transport increases more in solar forcing compared to equivalent CO2 forcing simulations, which is in line with the identified strong increase in large - scale precipitation in solar forcing scenarios.»

The warm water carried poleward during the La Nina will continue to release heat.

There is evidence in satellite and radiosonde data and in observational data for poleward expansion of the tropical circulation by as much as a few degrees of latitude since the 1970s [34]--[35], but natural variability may have contributed to that expansion [36].

It then flows along the western boundary of the Atlantic with some part of the flow moving eastward along the equator and then poleward into the ocean basins.

There are also poleward shifts in the vast atmospheric patterns that control where rain falls.

Species that already live on the tops of mountains or in the Polar Regions (such as the polar bear) will be unable to migrate upward or poleward into cooler habitats and so risk extinction.

General warming is said to expand the equatorial Hadley cells, shrink the polar ones, and move the dry zones polewards - I was asking why.

Warm and saline water transported poleward cools at the surface when it reaches high latitudes and becomes denser and subsequently sinks into the deep ocean.

Precipitation observations over land show the expected general increase of precipitation poleward of the subtropics and decrease at lower latitudes [1], [26].

For falsification we would need to observe events such as the mid latitude jets moving poleward during a cooling oceanic phase and a period of quiet sun or the ITCZ moving northward whilst the two jets moved equatorward or the stratosphere, troposphere and upper atmosphere all warming or cooling in tandem or perhaps an unusually negative Arctic Oscillation throughout a period of high solar activity and a warming ocean phase.

In the Medieval Warm Period, Greenland had agriculture and the Western Isles of Scotland were prosperous with a much larger population than today — which implies more poleward climate zones and zonal jets at that time.