Sentences with phrase «zones polewards»

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

Not exact matches

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.

«Regardless of the cause,» the authors note, «the poleward shift of the jet streams and the associated subtropical dry zone, if it continues, could have important societal implications.»

As the tropics creep poleward, the so - called subtropical dry zone could begin to squeeze adjacent, wetter temperate zones, the report warns.

While a 2009 estimate calculated that the tropical zone was expanding poleward at a rate of 222 to 533 kilometers every 25 years, the new report estimates that the expansion is occurring more slowly — between 138 and 277 kilometers per 25 years.

Climate models predict expanding Hadley Cells as the climate warms, meaning a poleward expansion of the subtropical desert zones.

As isotherms move up the mountainside and poleward, so does the climate zone in which a given species can survive.

On global vs. local, how about the global model prediction of a deepening and widening of the tropical atmospheric circulation, which leads to the Hadley cell expansion and the projection of the dry zones expanding polewards.

Whereas the Walker Circulation (or «Walker Cell») refers to an air flow parallel with the equator — all in the tropics — the Hadley Cell involves air rising in the tropics (follows the solar equator and gives rise to the Inter-Tropical Convergence Zone (ITCZ) which then flows polewards before sinking in the subtropics.

I guess I would feel better about this kind of juxtaposition if the expansion of the low - productivity zones described here were primarily poleward.

Arid subtropical climate zones are expanding poleward.

Poleward movement of zone boundaries — This must be the Hadley cells each side of the ITCZ (almost on the equator).

-- mostly land use changes Climate zones shifting polewards and uphill.

One of the difficulties using charts based on in situ observations is that there was very little exploration poleward of the «marginal ice zone» (the area of partial sea ice cover near the ice edge), so in older reconstructions the ice concentration was often assumed to be 100 % beyond the marginal zone.

So the emphasis shifted to poleward shift of climate zones with particular emphasis on rain and desert belts moving such that agriculture is disrupted by great changes in precipitation patterns.

This widening and the concomitant poleward displacement of the subtropical dry zones may be accompanied by large - scale drying near 30 ° N and 30 ° S.

As isotherms move up the mountainside and poleward, so does the climate zone in which a given species can survive.

Hadley Cell A direct, thermally driven overturning cell in the atmosphere consisting of poleward flow in the upper troposphere, subsiding air into the subtropical anticyclones, return flow as part of the trade winds near the surface, and with rising air near the equator in the so - called Intertropical Convergence Zone.

An active sun gives more zonal jets and / or more poleward climate zones with less global cloudiness and more energy into the oceans for gradually strengthening El Ninos as compared to La Ninas and a gradual rise in global tropospheric temperatures.

These merge and rise in the intertropical convergence zone near the Equator and blow eastward and poleward at altitudes of 2 to 17 km (1 to 11 miles).

These zones can move poleward or equatorward, in response to changes in the Earth's energy budget.

Poleward shifting was observed during the late 20th century warming, and it is well know that the zones shifted equatorward during the Little Ice Age.

A low pressure zone at 60 ° latitude that moves toward the equator, or a high pressure zone at 30 ° latitude that moves poleward, will accelerate the Westerlies of the Ferrel cell.

This trend is shifting climate zones and isotherms (lines of a given average temperature) poleward, at a rate of about 50 - 60 kilometers

We found that relative to the global - mean trends of the respective layers, both hemispheres have experienced enhanced tropospheric warming and stratospheric cooling in the 15 to 45 ° latitude belt, which is a pattern indicative of a widening of the tropical circulation and a poleward shift of the tropospheric jet streams and their associated subtropical dry zones.

We find that an increase in poleward heat transport by the tropical ocean results in a warming of the extra-tropics, relatively little change in the tropical temperatures, moistening of the subtropical dry zones, and partial but incomplete compensation of the planetary - scale energy transport by the atmosphere.