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1 Your web browser (Safari 7) is out of date. For more security, comfort and the best experience on this site: Update your browser Ignore JET STREAM For the complete encyclopedic entry with media resources, visit: Jet streams are currents of air high above the Earth. They move eastward at altitudes of about 8 to 15 kilometers (5 to 9 miles). They form where large temperature differences exist in the atmosphere. An air current is a flowing movement of air within a larger body of air. Air currents flow in the atmosphere, the layers of air surrounding the Earth. They form because the sun heats the Earth unevenly. As the sun beams down on the Earth, it warms some areas, particularly the tropics, more than others, such as the poles. As the Earth is heated, it warms the air just above it. The warmed air expands and becomes lighter than the surrounding air. It rises, creating a warm air current. Cooler, heavier air then pushes in to replace the warm air, forming a cool air current. Jet streams are air currents in the highest part of the atmosphere. The Atmosphere The atmosphere has a layered structure. From the Earth upward, the layers are the troposphere, the stratosphere, the mesosphere, the thermosphere, and the exosphere, which merges with thin gases of space. The boundaries between the layers are not sharply defined, and they vary with latitude and season. Weather occurs in the troposphere. On average, this layer extends to an altitude of about 10 kilometers (6 miles), ranging from less than 6 kilometers (4 miles) at the poles to about 20 kilometers (12 miles) at the Equator. The top of the troposphere is higher in summer than in winter. Because the troposphere contains most of the atmospheres water vapor, clouds usually form in this layer. 1 of 5

2 Temperature decreases rapidly in the troposphere as altitude increases. The suns rays pass easily through the troposphere. It is not heated directly by the sun, but by the Earth. The troposphere absorbs heat that is radiated from the Earth into the atmosphere. Various gases in the troposphere, such as carbon dioxide, water vapor, and methane, trap this radiated heat and dont let it escape into space. The warming of the atmosphere through this heat absorption is known as the greenhouse effect. The boundary between the turbulent troposphere and the calm, cold stratosphere is called the tropopause. Jet streams travel in the tropopause. Jet Stream Jet streams are some of the strongest winds in the atmosphere. Their speeds usually range from 129 to 225 kilometers per hour (80 to 140 miles per hour), but they can reach more than 443 kilometers per hour (275 miles per hour). They are faster in winter when the temperature differences between tropical, temperate, and polar air currents are greater. At most times in the Northern and Southern Hemispheres, there are two jet streams: a subtropical jet stream centered at about 30 degrees latitude and a polar-front jet stream whose position varies with the boundary between polar and temperate air. A reverse jet stream blows toward the west in tropical high altitudes during the Northern Hemispheres summer. It is associated with the heating of the Asian continent and may help bring summer monsoons to the Indian Ocean. Vocabulary Term 2 of 5 air current flowing movement of air within a larger body of air.

3 altitude the distance above sea level. atmosphere layers of gases surrounding a planet or other celestial body. boundary line separating geographical areas. greenhouse gas produced by animals during respiration carbon and used by plants during photosynthesis. Carbon dioxide dioxide is also the byproduct of burning fossil fuels. cloud visible mass of tiny water droplets or ice crystals in Earth's atmosphere. Equator imaginary line around the Earth, another planet, or star running east-west, 0 degrees latitude. exosphere outermost layer of Earth's atmosphere, beginning at an altitude of about 550 kilometers (341 miles) above the Earth's surface. greenhouse phenomenon where gases allow sunlight to enter Earth's effect atmosphere but make it difficult for heat to escape. jet stream winds speeding through the upper atmosphere. latitude distance north or south of the Equator, measured in degrees. meander verb to wander aimlessly. mesosphere region in Earth's atmosphere between the stratosphere and the thermosphere, about kilometers (31-50 miles) above the Earth's surface. methane chemical compound that is the basic ingredient of natural gas. monsoon seasonal change in the direction of the prevailing winds of a region. Monsoon usually refers to the winds of the Indian Ocean and South Asia, which often bring heavy rains. polar adjectivehaving to do with the North and/or South Pole. 3 of 5

4 polar-front jet fast-moving winds moving high in the atmosphere above stream polar and temperate regions. pole extreme north or south point of the Earth's axis. radiate verb to move outward from a central spot. reverse jet fast-moving winds moving west high in the atmosphere stream above tropical regions. season period of the year distinguished by special climatic conditions. level of Earth's atmosphere, extending from 10 stratosphere kilometers (6 miles) to 50 kilometers (31 miles) above the surface of the Earth. subtropical fast-moving winds moving high in the atmosphere in jet stream latitudes of between 30 and 40 degrees. temperate adjectivemoderate. temperature degree of hotness or coldness measured by a thermometer with a numerical scale. layer of the Earth's atmosphere located between 80 thermosphere kilometers (50 miles) and 550 kilometers (341 miles) above the Earth's surface. existing in the tropics, the latitudes between the Tropic of tropical adjective Cancer in the north and the Tropic of Capricorn in the south. region generally located between the Tropic of Cancer tropics plural (23 1/2 degrees north of the Equator) and the Tropic of Capricorn (23 1/2 degrees south of the Equator). tropopause troposphere turbulent boundary between the troposphere and the stratosphere layers in the Earth's atmosphere. lowest layer of the Earth's atmosphere, extending from the surface to about 16 kilometers (10 miles) above. adjectiveviolent or chaotic. 4 of 5

5 vapor visible liquid suspended in the air, such as fog. Articles & Profiles National Geographic News: Jet Stream Shifts May Spur More Powerful Hurricanes National Geographic Society. All rights reserved. 5 of 5

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