Sentences with phrase «descending air»

High pressures systems are driven dry descending air currents.

Low pressure develops below rising air and high pressure below descending air.

Its location next to a subtropical high - pressure belt of descending air produces stable atmospheric conditions over most of its surface area, and the climate generally is dry.

According to The Washington Post, the sandstorm is actually a haboob, «caused by the downdrafts of a collapsing thunderstorm complex generated by the Southwest monsoon... When the downdrafts — made up of rapidly descending air — smashed down on the desert ground, they stirred up large amounts of sand and dust subsequently carried forth by the storm outflow.»

The upshot of the differences in air density that manifest between 400 hPa and 50 hPa is fast displacement of low density air that travels to the top of the atmosphere in a cone that surrounds the very cold dense descending air from the mesosphere.

So ascending air and descending air produce an average of relative humidity decreasing with height.

Anastassia is entirely correct in that the rising air must be balanced by descending air creating high pressure in the descent arm.

The rotation spreads the temperature differentials latitudinally forming discrete climate zones with favoured regions of either ascending or descending air with jet streams threaded between them.

Descending air suppresses precipitation by drying the lower atmosphere so this process expands the subtropical dry zones.

I also explained why the extra warmth at the surface is provided by compression of descending air converting potential energy (PE) to kinetic energy (KE) and not from downward radiation from GHGs in the air warming the ground beneath.

Deserts lie under descending air which warms adiabatically due to subsidence.

b. Most importantly descending air currents adiabatically generate a thermal ceiling that prevents rising convection currents from carrying away surface heat.

The arid conditions here result from the constant presence of descending air containing little moisture.

The ITCZ is located at the ascending branch of the Hadley cell, an atmospheric circulation associated with rising air near the equator and descending air in subtropical regions (see Fig. 2 for a schematic).

When the downdrafts - made up of rapidly descending air - smashed down on the desert ground, they stirred up large amounts of sand and dust, subsequently carried forth by the storm outflow.

When kinetic energy is converted to potential energy by the interaction with gravity whilst air is rising that disappears from the planet's radiative exchange with sun and space until it is returned to the surface again by descending air.

Descending air currents of High pressure systems are also the reason we have deserts and why the world's records for hottest temperatures on each continent are not at the equator but about 32 to 36 ° North as seen in the above diagram.

Whereas the CO2 has reduced the rate of uplift in the ascending column (which warms the surface) CO2 at lower levels reduces the rate of descent in the descending column which reduces surface temperature because less warmth is then being generated via compression of descending air.

According to the study, as the planet warms, the Hadley Cell, which links together rising air near the Equator and descending air in the subtropics, expands poleward.

The descending air masses of the Polar Cells is responsible for low precipitation at the polls.

We also know how variable can be the speed of convective uplift in depressions and how rising air is related to low surface pressure and descending air to high pressure.

The descending air referred to above, upon reaching the lower troposphere, is forced to diverge by the presence of Earth's surface.

The physical model I have in mind for this negative WV feedback is based on a proposal of Prof. William Gray (Colorado State University), who pictured cumulus clouds carrying moisture into the UT, but occupying only a small area; the remaining (and much larger) area experiences descending air («subsidence»)-- hence drying.

My impression is that it is the area of the cloud free subtropical high pressure cells of descending air that is a strong variable factor explaining the change in the temperature of the in - feed waters that become the westerly currents that occupy the tropical latitudes.

This is because in the real world when the lapse rate is not dry adiabatic (and it is not dry adiabatic in an environment where condensation is at least distantly present), the descending air experiences an upward force being drier than the surroundings.

The descending air in the subtropical high - pressure belts diverges near the surface; the air that does not flow equatorward tends to flow eastward and poleward as the midlatitude westerlies.

The descended air then travels toward the equator along the surface, replacing the air that rose from the equatorial zone, closing the loop of the Hadley cell.

The descending air was saturated at its point of coldest ascent.

(The ascending air is moving a lot faster than the descending air so mass balance does occur).