«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.
Because the movement of the ITCZ follows the position of maximum surface heating associated with meridional displacement of the overhead position of the sun, near - equatorial regions experience two rain seasons, whereas regions
further poleward experience one distinct rainfall season.
«We think, but have not yet been able to establish, that this is connected to independently observed poleward expansion of the Hadley circulation,» Emanuel says, referring to a large - scale pattern of global winds, which in recent years has also moved
further poleward.
Anywhere
further polewards and Earth would rotate faster.
Part of the flow descends in the subtropical high - pressure belts, and the remainder merges at high altitudes with the midlatitude westerly winds
farther poleward.
5) Rotation of the Earth combined with the polewards motion of the air leads to zonal winds and prevents
further polewards movement.
Not exact matches
«If they move another two to three degrees
poleward in this century, very dry areas such as the Sahara Desert could nudge
farther toward the pole, perhaps by a few hundred miles.»
They've shifted
poleward by up to 5 degrees so
far since 1979:
«If they move another 2 to 3 degrees
poleward in this century, very dry areas such as the Sahara desert could nudge
farther towards the pole, perhaps by a few hundred miles,» said study team member John Wallace from the University of Washington.
Because saltier water is denser and thus more likely to sink, the transport of salt
poleward into the North Atlantic provides a potentially destabilizing advective feedback to the AMOC (Stommel, 1961); i.e., a reduction in the strength of the AMOC would lead to less salt being transported into the North Atlantic, and hence a
further reduction in the AMOC would ensue.
We have seen the jet streams move
poleward when the AO is positive so in the Mediaeval Warm Period we must have had a positive AO despite the more active sun because the jets seem to have been even more
poleward then than at the peak of the Modern Warm Period (so
far).
Further, while the effect of more CO2 should be most
polewards, the main warming of the oceans is in the subtropics, where sunlight has its largest effect, due to less clouds (at least in de period 1985 - 2003).
The air circulation systems in both hemispheres move
poleward and the ITCZ moves
further north of the equator as the speed of the hydrological cycle increases due to the cooler stratosphere increasing the temperature differential between stratosphere and surface.
Their spatial extent towards the tropics moves with the jet stream, extending
farthest towards the tropics (about 35 deg latitude) during winter and retreating
polewards (
polewards of 50 deg latitude) during summer.