Presentation on theme: "Video Field Trip: Polar Weather"— Presentation transcript:
1Video Field Trip: Polar Weather Take a field trip to the North and South Poles with Discovery Channel. Answer the following questions after watching the video.Why is Antarctica technically called a desert?What would happen to the ocean if the ice shelves around Antarctica melted?
2Factors that Affect Climate Chapter 21, Section 1
3LatitudeAs latitude increases, the intensity of solar energy decreasesNear the equator, the sun’s energy strikes the planet at nearly right angles, therefore the sun’s ray’s are more intense hereTropical Zone – region between 23.5º north and 23.5º south of the equator; sun’s rays are most intense; generally warm year-roundTemperate Zone – region located between 23.5º and 66.5º north and south of the equator; sun’s rays strike Earth at a smaller angle; hot summers and cold wintersPolar Zone – the region between 66.5º north and south of the equator and the poles; sun’s rays strike at a very low angle; experience cold temperatures year-round
4Concept CheckCompare and contrast tropical zones, temperate zones, and polar zones in terms of location and the intensity of solar radiation that each receives.
5ElevationAir temperature decreases with elevation by an average of ~6.5º every 1000 metersThe higher the elevation is, the colder the climateThe elevation of an area also determines the amount of precipitation it receives
7Concept Check How does elevation affect climate? The higher the elevation, the colder the air and therefore, the colder the climate.
8TopographyTopographic features such as mountains play an important role in the amount of precipitation that falls over an areaHeavy precipitation often falls on the windward side of mountainsBy the time the air reaches the leeward side, much of the moisture is lost (rain shadow)Rain shadows can extend for hundreds of kilometers downwind of a mountain range
10Concept Check How does a mountain range affect climate? Windward side: humid air moves up the mountain’s slopes and cools to form clouds that produce precipitation.Leeward side: the air is warm and very dry.
11Water BodiesLarge bodies of water such as lakes and oceans have an important effect on the temperature of an area because the temperature of the water body influences the temperature of the air above itPlaces downwind of a large body of water generally have cooler summers and milder winters than places at the same latitude that are farther inland
12Concept Check How do large bodies of water affect climate? Places downwind of a large body of water generally have milder seasons than places farther inland at the same latitude.
13Atmospheric Circulation Global winds are another factor that influences climate because they distribute heat and moisture around EarthWinds are constantly moving warm air toward the poles and cool air toward the equatorThe low-pressure zones at the equator and subpolar regions lead to the formation of clouds and precipitation
15Concept Check What effect do global winds have on climate? They move heat and moisture around Earth.
16VegetationThe types of plants that grow in a region depend on climate and affect climateVegetation can affect both temperature and precipitation patterns in an areaVegetation influences how much of the sun’s energy is absorbed and how quickly this energy is released (influences temperature)During a process called transpiration, plants release water vapor from their leaves into the air (influences precipitation)
17Concept CheckDescribe different ways in which vegetation affects climate.It influences how much of the sun’s energy is absorbed and released, thereby affecting temperature. Plants release water vapor and influence regional precipitation patterns.