Weather and Atmosphere

Layers of the Atmosphere Temperature Pattern Air Pressure Pattern Important Characteristics Troposphere The higher you go up, the colder it gets Highest near the Earth’s surface All weather and life exists here Stratosphere It gets warmer as you go up in the layer Lower than the troposphere Weather balloons; jets fly at the bottom of this layer; ozone at this layer Mesosphere It gets colder as you go up in the layer Lower than the stratosphere Coldest layer; air extremely thin; meteors and shooting stars Thermosphere It gets warmer as you go up Lower than the mesosphere Hottest Layer; auroras; space shuttles Exosphere Temperature begins to level off Lowest air pressure Satellites orbit

Sample Question How does the temperature of the stratosphere compare to the mesosphere? It is colder than the mesosphere because the stratosphere contains the ozone layer It is warmer than the mesosphere because the stratosphere contains the ozone layer It is colder than the mesosphere because the stratosphere contains the ionosphere It is warmer than the mesosphere because the stratosphere contains the ionosphere

Sample Question Which layer of the atmosphere has the most water? A. Mesophere B. Thermosphere C. Stratosphere D. Troposphere

Air Pressure and Density Air pressure: Air pressure decreases as you go up in the atmosphere because there are fewer air molecules as altitude increases Density: Density decreases in our atmosphere as we go up. Most of the mass of the atmosphere is near the surface.

Sample Question Why does air pressure decrease from the troposphere to the exosphere? Because there are fewer air molecules as altitude increases Because there are more air molecules as altitude increases Because there are higher temperatures as altitude increases Because there are lower temperatures as altitude increases

Components of Air 78% = Nitrogen 21% = Oxygen 1% =CO2, Argon and   78% = Nitrogen 21% = Oxygen 1% =CO2, Argon and other gases

Heat Transfer in the Atmosphere

Sample Question How does convection of air produce thunderstorms? By causing warm air to sink and cold air to rise By causing warm air to rise and cold air to sink By causing both warm air and cold air to rise By causing both warm air and cold air to sink

Global Wind Belts

Global Winds Doldrums: Low pressure near the equator; warm air rises to the top of the troposphere; heavy evaporation from warm ocean water fuels tropical storms Tradewinds: Blow from the east; move from the horse latitudes toward the poles; strong and steady but die as they reach the equator Horse Latitudes: High pressure zones 30N and 30S of the equator, warm air traveling from the equator cools and sinks here; weather tends to be clear and dry

Global Winds Westerlies: Blow from the west; move from the horse latitude towards the poles; bring storms across much of the United States Polar Easterlies: Blow from the east; move from the polar regions to the mid latitudes; stormy weather often occurs when cold air of the easterlies meets warm air of the westerlies

Coriolis Effect If Earth did not rotate, global winds would flow directly from the poles to the equator The Earth’s rotation changes the direction of winds In the Northern Hemisphere, winds curve to the right and in the Southern Hemisphere, winds curve to the left

Coriolis Effect

Sample Question Which best explains how the Coriolis effect influences weather conditions? It causes winds to rotate, forming tornadoes on Earth It causes winds to move to the right in the southern hemisphere It causes winds to turn to the right in the northern hemisphere It causes winds to follow a straight-line path around Earth

Pressure Systems High Pressure: Air sinks slowly; air moves all the way around a high-pressure center; large and change slowly; brings clear skies and calm air or gentle breezes Low Pressure: Surrounds a center of low pressure; air moves upward and inward toward the lowest pressure and then up to high altitudes; can bring stormy weather

Sample Question Which occurs within a high-pressure system? A. The formation of clouds B. The formation of hurricanes C. Large clouds, as air rises D. Calm weather, as sir sinks

Fronts Cold Fronts: Forms when a cold air mass pushes a warm air mass and forces the warm air to rise; produce cumulonimbus clouds and precipitation are produced; brief, heavy storms are likely; after the storms, the air is cooler and often very clear Warm Fronts: Forms when a warm air mass pushes a cold air mass and warm air rises slowly over the cold air; produces cloud covered skies; brings hours of steady rain; after front passes, the air is warmer

Fronts

Sample Question What has most likely occurred in this area? Day and Time Tuesday at 8 AM Tuesday at 2 PM Temperature 60F 40F Pressure 30.28 in 29.97 in Winds Southwest Northwest Skies Partly Cloudy Cloudy, Rainy and Thunder A. A warm front has passed B. A cold front has passed C. A blizzard has taken place D. A high-pressure system has stalled

Humidity and Dew Point Humidity Dew Point Amount of water vapor in the air Higher humidity makes the air seem hotter and damper Temperature at which air with a given amount of water vapor will reach saturation The higher the dew point of air, the more water vapor the air contains

Sample Question On which day could the air have held the greatest amount of water vapor at 3:00 Four-Day Temperature Recordings at 3:00 PM Day Temperature F Thursday 59 Friday 63 Saturday 72 Sunday 64 A. Thursday B. Friday C. Saturday D. Sunday

Sample Question Why is it important for the United States to monitor air pollution levels in other countries? Air pollution can improve the ozone layer amounts in the atmosphere Air pollution can travel to the United States and affect people’s health The United States is the only country able to monitor the air quality The united States has clean air and is able to help other countries

The Water Cycle http://www.enchantedlearning.com/wgifs/Watercycle.GIF Click link for water cycle diagram

Sea Breeze/Land Breeze

Gulf Stream Warm-Water current that carries warmth from the tropics to the North Atlantic ocean waters. As the waters that feed the Gulf Stream pass near the Gulf of Mexico, the solar rays that strike there warm the water. The winds that blow over it , warms coastal areas. Ocean currents can cause two places at the same latitude to have different climates. For example, England’s west coast is warmer than Canada’s east coast. Since the gulf stream travels from the US east coast to England’s west coast it makes England's west coast warmer. In the spring , the gulf stream causes weather to be rainy near the southern east coast since it creates a warm and moist environment.

Sample Question Runoff is an important part of the water cycle. 1. What is the final destination for runoff that flows on the surface of the continents? 2. How can runoff water contribute to the weather in an area?

Sample Question How are clouds formed? A. Condensation B. Evaporation C. Transpiration D. Precipitation