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Chapter 13: Atmosphere & Climate Change Section 1: Climate & Climate Change Objectives • Explain the difference between weather and climate. • Identify four factors that determine climate. • Explain why different parts of the Earth have different climates. • Explain what causes the seasons Climate • _______ is the _______ weather _______ in an area _____ a long period of time. Climate • Climate is determined by a variety of factors that include ______, atmospheric circulation patterns, oceanic circulation patterns, the local geography of an area, _____ ______, and ______ _______. Climate • The most important of these factors is ______ ____ the ______. Latitude • _______ is the distance ____ or _____ from the _______ and is expressed in degrees. Latitude • The equator is located at _° latitude. • The most northerly latitude is the North Pole, at __° north, whereas the most southerly latitude is the South Pole, at 90° _____. Latitude • Latitude ______ ______ climate because the _____ of _____ _____ an area of the Earth receives depends on its latitude. Low Latitudes • _____ solar energy falls on areas ____ the equator than on areas closer to the poles. • The incoming solar energy is concentrated on a small surface at the equator. Low Latitudes • In ____ ____ the _______, night and day are ____ about __ _____ long throughout the year. Low Latitudes • In addition, ________ are ____ yearround, and there are __ _______ or ______. High Latitudes • In regions _____ to the _____, the sun is _______ in the sky, _______ the ______ of ______ arriving at the surface. • In the northern and southern latitudes, sunlight hits the Earth at an _____ _____ and spreads over a ______ surface area than it does at the equator. High Latitudes • ______ _______ ________ near the poles are therefore ______ than they are at the equator. High Latitudes • At 45° north and south latitude, there is as much as __ ____ of ________ each day during the ______ and as little as _ ____ of _______ each day in the ______. High Latitudes • Near the poles, the sun sets for only a few hours each day during the summer and rises for only a few hours each day during the winter. • Thus, the yearly temperature range near the poles is very large. Low and High Latitudes Atmospheric Circulation • Cold air _____ because it is _____ than warm air. As the air sinks, it ______ and _______. • Warm air _____. It expands and cools as it rises. • Warm air can hold _____ water vapor than cold air can. Therefore, when warm air cools, the water vapor it contains may condense into liquid water to form rain, snow, or fog. Atmospheric Circulation • _____ energy heats the ground, which warms the air above it. This warm air rises, and cooler air moves in to replace it. This _______ of air within the atmosphere is called _____. Atmospheric Circulation Atmospheric Circulation • Because the Earth ______, and because different latitudes receive different amounts of solar energy, a ______ of global atmospheric circulation results. • This circulation pattern _______ Earth’s __________ patterns. Global Circulation Patterns • Cool air normally sinks, but cool air over the equator ______ ______ because hot air is rising up below it. This cool air is ______ _____ from the equator toward the North and South Poles where it __________ at about 30º north latitude and 30º south latitude. Global Circulation Patterns • Some of the air _____ back to the Earth’s surface and becomes warmer as it descends. This warm, dry air then moves across the _______ and causes water to _________ from the land below, _____ ___ _______. Global Circulation Patterns • At about __º north and __º south latitudes, this air ______ with cold air traveling from the poles. Prevailing Winds • Winds that blow ________ in one direction throughout the year are called _________ _____. Prevailing Winds • Because of the rotation of the Earth, these winds __ ___ blow directly northward or southward. • Instead, they are _______ to the ____ in the _______ Hemisphere and to the ___ in the ________ Hemisphere. Prevailing Winds • Belts of prevailing winds are produced in both hemispheres between 30º north and south latitude and the equator. • These belts of winds are called the _____ _____. • The trade winds blow from the _______ in the Northern Hemisphere and from the __________ in the Southern Hemisphere. Prevailing Winds • Prevailing winds known as the _______ are produced between 30º and 60º north latitude and 30º and 60º south latitude. • In the Northern Hemisphere, these are southwest winds, and in the Southern Hemisphere, these winds are northwest winds. • The _____ _______ blow from the poles to 60º north and south latitude. Oceanic Circulation • Ocean currents have a great effect on climate because water holds ____ _____ of ____. Oceanic Circulation • The _______ of ______ ocean _______ is caused mostly by ______ and the rotation of the Earth. • These surface currents _________ warm and cool masses of water around the world and in doing so, they affect the climate in many parts of the world. El Niño–Southern Oscillation • ___ _____ is the warm phase of the El Niño–Southern Oscillation. • It is the _____ occurrence in the _____ ______ Ocean in which the surface-water temperature becomes _______ ____. El Niño–Southern Oscillation • During El Niño, winds in the western Pacific Ocean (which are usually weak) strengthen and push warm water eastward. El Niño–Southern Oscillation • ______ follows this warm water eastward and produces _______ _______ in the _________ half on the ____, but _____ in ________ and ________. El Niño–Southern Oscillation • ___ _____ is the _____ phase of the El Niño–Southern oscillation. It is the periodic occurrence in the eastern Pacific Ocean in which the surface water temperature becomes unusually ____. Pacific Decadal Oscillation • The ______ _______ _______ ___ is a ____-_____, 20 to 30 year _____ in the ________ of warm and cold water masses in the Pacific Ocean. • PDO _______ the climate in the northern Pacific Ocean and North America. • It affects ocean surface temperatures, air temperatures, and precipitation patterns. Topography • Height above sea level (______) has an important effect on climate. Temperatures fall by about __°C (about 11°F) for every 1,000 m increase in elevation. • Mountain ranges also influence the distribution of precipitation. This effect is known as a ____ _____. Other Influences on Earth’s Climate • Both the ___ and ______ ______ influence Earth’s climate. • At a solar _______, the sun emits an increased amount of ultraviolet (UV) radiation. UV radiation produces more _____, which ______ the stratosphere. Other Influences on Earth’s Climate • In large-scale volcanic eruptions, ______ _______ gas can reach the upper atmosphere, where it can remain for up to __ years. • The sulfur dioxide, reacts with smaller amounts of water vapor and dust in the ___________, forming a bright layer of haze. Other Influences on Earth’s Climate • This layer of haze ______ enough sunlight to cause the global temperature to _______. Seasonal Changes in Climate • The _______ result from the ____ of the Earth’s ___, which is about 23.5° relative to the plane of its orbit. Seasonal Changes in Climate • Because of this tilt the angle at which the sun’s rays strike the Earth changes as the Earth moves around the sun. Seasonal Changes in Climate • During _____ in the Northern Hemisphere, the Earth tilts _____ the sun and receives direct sunlight. Therefore, the amount of time available for the sun to heat the Earth becomes greater. • During summer in the Northern Hemisphere, the _______ Hemisphere tilts ____ from the sun and receives less direct sunlight. Seasonal Changes in Climate • During the summer in the Southern Hemisphere, the situation is reversed. • Example: Christmas in Australia and Panama = a sunny day at the beach. End of section 1 Review q’s: 1,2,6,7,10,11,19, 20,26 and 27