Presentation on theme: "Ch. 3 Weather and Climate http://www.youtube.com/watch?v=lrPS2HiYVp8 The video explains how the climate system on earth works and is 3:51 min long This."— Presentation transcript:
1 Ch. 3 Weather and Climate http://www.youtube.com/watch?v=lrPS2HiYVp8 The video explains how the climate system on earth works and is 3:51 min longThis video follows the flow of section 1
2 Section 1 Factors Affecting Climate The Sun and LatitudeA. Weather is the condition of the atmosphere at a given time and placeB. Climate-weather conditions in a region over a long period of timeC. The closer you are to the tropics and the sun’s direct rays, the warmer you are…duhBecause the sun does not hit each region of the globe equally each place has a different climateWhat were the three regions of the globe we studied last chapter?PolarMid latitudesTropicsThis can effect the way people live in different parts of the world and how we as humans view each placeShow picture on page 41Texas drought 2000How would this change your view of the region?The sun plays a major role in the earths weather and climate patterns. It is important to remember that weather is he condition of the atmosphere given at a certain time and place. while climate is the weather conditions for a certain region over period of time.
3 Temperature-measurement of heat Atmosphere reflects half of sun’s energy and absorbs the other half which heats up the earthGreenhouse Effect-Earth allows sun’s heat in, traps it and slowly allows it to release into spaceG. Global Warming-CO2 absorbs heatH. Some say man is responsible while others say it’s a natural cycleThe Temperature is caused by the solar energy from the sun.half is reflected out of the atmospherethe rest is absorbed and converted into heat which is temperatureThis process is called the green house effectThe air in the atmosphere slows the release of the heat into spaceGlobal warmingScientist believe caused by humansIncrease in the earth temperatureRise in CO2 ( carbon dioxide) because of the use of coal, natural gas, and oilCO2 absorbs heat and increases earths temperature
5 Do you know?How does the Earth’s Atmosphere help keep the planet Warm?Green house effect- slowing the loss of heat into space
6 Random Fact Venus and global warming The Little Ice age 1500’s -1800’s Venus is 96 % CO2 and because of this it is 890 FThe Little Ice age 1500’s -1800’sVenus help scientist understand the global warming on earthLittle ice age – temperature dropped 1 c
7 B. Higher you go, less pressure Atmospheric PressureA. Pressure of airB. Higher you go, less pressureC. As air heats up, it expands, becomes less dense and rises (low pressure system)Climate -weather in an area over a long period of timeAir has weight= air pressureClimbing mountainsFlying planesAir heated becomes less dense and rises+ low pressure areaRising air usually cools and the water vapor in it is carried away to form clouds- can bring rain or stormsBecause of this process low pressure usually accompanies unstable weather conditionsCyclones anything from light breeze to heavy storm
8 G. Usually bring stable, clear and dry weather D. Air rises, cools and forms water vaporE. Centers of low pressure systems are called cyclones… sometimes a slight breeze while other times a powerful stormF. High pressure systems are created from cold air sinking towards the EarthG. Usually bring stable, clear and dry weatherBecause of this process low pressure usually accompanies unstable weather conditionsCyclones anything from light breeze to heavy storm
9 Do you KnowWhat kind of weather is usually associated with an area of Low pressure?Unstable weather, anything from a slight breeze to bad storms
10 H. Look at pressure diagram on Page 43. III. Global Wind Belts A. Wind flows from high pressure areas to low pressure areasB. TireC. Prevailing winds-blow from the same direction all the time…NE and SE trade winds, westerlies, easterliesD. Doldrums-along Equator, calm…little windPressure affects wind patterns on earthWind flows from high pressure to low pressure areasThink of when filling a tire the air will rush out if you let it
12 E. Front-two air masses of widely different temperatures or moisture levels meet F. Usually results in precipitationG. Prevailing winds up in atmosphere make up the jet stream… wind speed can reach 300 miles per hourH. Jet streams move heat and major weather patterns
14 Do you Know?How is wind directly related to the differences of air pressure?Wind flows from high areas of high pressure to low pressure areas
15 A. Water heats and cools more slowly than land Ocean and CurrentsA. Water heats and cools more slowly than landB. Locations near large bodies of water have more consistent temps then inland locationsC. Earth’s wind, rotation and temperatures create currents (great rivers of sea water)D. Move clockwise in NH and counter in SHCalifornia near the coast has more consistent weather will the Mid West us- it will change every five minutesCurrents move heat back and fourth between tropics and polar regions
17 Currents help balance water temperatures in the oceans by moving it all around.
18 Do you know? What are the main forces that create ocean currents? Wind, earth’s rotation, varying ocean temperatures
19 Section 2: Weather Factors Read to DiscoverWhat are the common forms of precipitation, and how are they formed?How do mountains and elevation affect weather and climate?What are the different types of storms, and how do they form?
21 Section 2: Weather Factors Forms of PrecipitationRain—Liquid formed through condensation of water vaporSnow—Ice crystals formed in cloudsSleet—Rain that freezes as it fallsHail—Chunks of ice formed in storm clouds
22 Section 2: Weather Factors Increase in elevation causes drop in temperature.Mountains cause orographic effect: Moist air meets a barrier and is pushed upward, causing cooling, condensation, and precipitation.Mountainside facing wind is the windward, wetter side; side facing away from wind is the leeward, drier side, called the rain shadow.
23 Section 2: Weather Factors Types of StormsMiddle-latitude storms form when cold, dry polar air mixes with moist, warm tropical air. Examples include thunderstorms and tornadoes.Tropical storms are usually smaller and lack fronts. Examples include hurricanes and typhoons.
24 Section 3: Climate and Vegetation Patterns World Geography Today3/31/2017Section 3: Climate and Vegetation PatternsRead to DiscoverHow do the two tropical climates differ?What conditions are common in dry climates?What climates are found in the middle latitudes?What characterizes high-latitude and highland climates?Chapter 3
25 Tropical Humid Climate Tropical Wet and Dry Climates Section 3: Climate and Vegetation PatternsTropical Humid ClimateTropical Wet and Dry ClimatesClose to equatorWarm temperaturesRainfall all yearReceives Sun’s rays directly all yearRising warm airRain forestsMonsoonsNorth and south of tropical humidCaused by seasonal change in this areaAlternating wet and dry seasonsSavannas
26 Section 3: Climate and Vegetation Patterns Dry Climate AreasGenerally centered about 30 degrees north and south of equatorSubtropical high-pressure zone causes sinking dry air, with little rain.Winters may be very cold, summers very hot.Hardy plants and animals
27 Section 3: Climate and Vegetation Patterns Middle-Latitude ClimatesMediterranean—Long, dry summers and mild winters; scrub woodland vegetationHumid Subtropical—Hot, humid summers and mild winters; temperate forestsMarine West Coast—Mild all year; may support dense forestsHumid Continental—Variable, with four seasons; enough rain to support forests
28 Section 3: Climate and Vegetation Patterns High-Latitude and Highland ClimatesSubarctic—Long, cold winters and short, warm summers; vast evergreen forestsTundra—Long winters, with permafrost; low shrubs, lichens, mosses, fernsIce Cap—Polar climates; few land plants or animalsHighland—Varies by elevation, with low elevations relatively mild and high elevations similar to ice cap