Transcript Climate[1]
Climate and Weather Climate Climate is the condition of the atmosphere over a long period of time. Think! What is the difference between a desert and a tropical rainforest? What is the difference between Antarctica and a desert? If you said temperature and rainfall (precipitation) you are right! Climate Three characteristics of climate are: A. Temperature B. Precipitation C. Seasons Think! Why do some places get more or less rain? Why are some places hot and some places cold? Why do some places have seasons that are equal in length and some places don’t? Climate Four factors or elements that affect A. B. C. D. climate are: Latitude Wind Currents Proximity to Water Elevation Latitude Temperature is hotter or colder at different latitudes because the earth is tilted on its axis at 23.5% in relation to the sun and it revolves around the sun. The tilt of the earth causes different amounts of sunlight to hit the earth at different times so we have seasons. Latitude The Tropic of Cancer and Capricorn mark the farthest points north and south that receive the direct rays of the sun. This is why the area near the equator is very warm all year. Latitude When the direct rays of the sun hit the Tropic of Cancer or Capricorn it is called a solstice. When the direct rays of the sun hit the equator it is called an equinox. Wind Currents Wind and ocean currents distribute the sun’s heat through convection, the transfer of heat in the atmosphere through upward motion of the air. Proximity to Water Areas near the ocean tend to have a milder winter and a cooler summer. Ocean currents are like rivers in the ocean. Warm water flows away from the equator and cold water flows toward the equator. Proximity to Water Some important ocean currents are: A. The North Atlantic Drift - This ocean current warms Western Europe. B. The East Australian Current C. The Gulf Stream Elevation Elevation influences temperature. As you go up in elevation the temperature becomes colder because the atmosphere is thinner. Areas with very high elevations can have vegetation similar to the arctic. Elevation Some areas with high elevations are: A. The Plateau of Tibet in Asia B. Countries in the Andes Mountains such as Bolivia, Chile, and Peru C. Switzerland in the Alps Climate Zones Climate zones are classified by temperature and precipitation. Biome refers to the climate of an area and the types of animals and vegetation that are found in that area. Climate Zones Low Latitudes - Tropical Wet and Tropical Wet and Dry. Middle Latitudes - Mediterranean, Humid Subtropical, Humid Continental, Marine West Coast. High Latitudes - Subarctic, Tundra, Icecap Varies - Semiarid, Arid, Highland Vegetation Regions The types of plants that grow in an area are dependent on three things: temperature, precipitation, and amount of sunlight. Deserts Deserts are based on precipitation. There are hot and cold deserts. Some hot deserts are: The Sahara, The Namib, The Atacama, and The Gobi. Antarctica is actually a desert because it gets very little rainfall. Grasslands Grasslands are classified by temperature and precipitation. Grasslands don’t receive enough rain for trees to grow but they can vary in temperature. Tropical Grasslands Savanna - Africa Llanos - Colombia and Venezuela Cerrados - Brazil Savanna in Africa Temperate Grasslands Prairie - The United States and Canada Pampas - Argentina Steppe - Central Asia Yurts, portable houses, on the Mongolian steppe. Cold Grasslands Tundra - The Tundra is a flat treeless plain located in the far north on the coast of Alaska, Canada, and Russia. The Tundra has short grasses, a few shrubs, mosses, and some flowers. Underneath the tundra there is permafrost, permanently frozen subsoil. Forests Forests near the equator have more broadleaf trees and the leaves are larger because the area receives more sunlight. Forests in the high latitudes have more coniferous trees because they grow better with less sunlight. Rainforests Rainforests are found in tropical wet climate zones in the low latitudes. What countries do you think have rainforests? A. Brazil - Amazon Rainforest B. Congo C. Indonesia D. Most of Central America Taiga The Taiga is a large coniferous forest that covers most of Siberia. In Canada and Alaska coniferous forests are called boreal forests. The Taiga is characterized by cold winters and short summers. Middle Latitude Forests Middle latitude forests have a mix of coniferous trees and deciduous trees. Deciduous trees are broadleaf trees that lose their leaves in the winter time. Climographs A climograph is a graphical representation of temperature and precipitation for a location. By comparing climographs we can understand differences in climate from one location to another.