Search results
Results From The WOW.Com Content Network
The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere (troposphere). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences in ...
Hoy No Circula (literally in Spanish: "today [your car] does not circulate", known as No-drive days) is the name of an environmental program intended to improve the air quality of Mexico City. A similar coordinated program operates within the State of México , which surrounds Mexico City on three sides.
At the 60th parallel, the air rises to the tropopause (about 8 km at this latitude) and moves poleward. As it does so, the upper-level air mass deviates toward the east. When the air reaches the polar areas, it has cooled by radiation to space and is considerably denser than the underlying air. It descends, creating a cold, dry high-pressure area.
On weather maps, the surface position of the cold front is marked by a blue line with triangles pointing in the direction where cold air travels and it is placed at the leading edge of the cooler air mass. [2] Cold fronts often bring rain, and sometimes heavy thunderstorms as well. Cold fronts can produce sharper and more intense changes in ...
This condition typically correlates with air pollution and poor air quality due to the possible health risks it can cause to humans and the environment. [1] Due to light winds and lack of precipitation, pollutants cannot be cleared from the air, either gaseous (such as ozone) or particulate (such as soot or dust). [2]
The polar front arises as a result of cold polar air meeting warm tropical air. It is a stationary front as the air masses are not moving against each other and stays stable. [ 2 ] Off the coast of eastern North America , especially in winter , there is a sharp temperature gradient between the snow-covered land and the warm offshore currents.
The Hadley cell, also known as the Hadley circulation, is a global-scale tropical atmospheric circulation that features air rising near the equator, flowing poleward near the tropopause at a height of 12–15 km (7.5–9.3 mi) above the Earth's surface, cooling and descending in the subtropics at around 25 degrees latitude, and then returning ...
The westerlies (blue) and trade winds (yellow and brown) The general atmospheric circulation. Trade winds (red), westerlies (white) and the South Pacific anticyclone (blue) [ 1 ] The westerlies , anti-trades , [ 2 ] or prevailing westerlies , are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees ...