Presentation is loading. Please wait.

Presentation is loading. Please wait.

Atmosphere Water and Air… the two essential elements on which life depends have become global garbage cans.

Similar presentations

Presentation on theme: "Atmosphere Water and Air… the two essential elements on which life depends have become global garbage cans."— Presentation transcript:

1 Atmosphere Water and Air… the two essential elements on which life depends have become global garbage cans

2 Essential Standards EEn.2.5 Understand the structure of and processes within our atmosphere. EEn Summarize the structure and composition of our atmosphere. EEn Explain the formation of typical air masses and the weather systems that result from air mass interactions. EEn Explain how cyclonic storms form based on the interaction of air masses. EEn Predict the weather using available weather maps and data (including surface, upper atmospheric winds, and satellite imagery). EEn Explain how human activities affect air quality. EEn.2.6 Analyze patterns of global climate change over time. EEn Differentiate between weather and climate. EEn Explain changes in global climate due to natural processes. EEn Analyze the impacts that human activities have on global climate change (such as burning hydrocarbons, greenhouse effect, and deforestation). EEn Attribute changes to Earth’s systems to global climate change (temperature change, changes in pH of ocean, sea level changes, etc.).

3 Atmospheric composition
Structure and processes

4 Assignment! Create a chart for the next 2 weeks (Dec 20th will be the last day) Each day we will observe the cloud types during your class We will record the cloud types along with the weather each day If the weather changes during the day – it is your responsibility to change / add to the weather for that day You will write a brief conclusion at the end stating if you see a difference in the weather depending on the cloud type

5 Brief Review What was the composition of the original atmosphere like?
What evolved on Earth that drastically changed the composition? How did these organisms change the composition of Earth’s atmosphere? Mostly methane, carbon dioxide, and ammonia. Deadly to living organisms today Plants Drastically increased the oxygen content

6 What is the structure of the atmosphere?
4 layers from bottom to top last layer sometimes divided in half to make 5 Troposphere – lowest layer, weather happens here Stratosphere – next layer up, jets fly here, ozone found here Mesosphere – meteors burn up here Thermosphere – hottest layer, space stations here Ionosphere – where auroras take place Exosphere – outer layer, space stations

7 How are layers divided? According to temperature trends
Each layer is separated by a pause Tropopause between troposphere and stratosphere etc What happens to the temperature in each layer of the atmosphere? Troposphere – temp decreases Stratosphere – temp increases Mesosphere – temp decreases Thermosphere – temp increases

8 What is the atmosphere made of?
Mostly nitrogen (N) – about 78% Oxygen (O) – about 21% Carbon Dioxide (CO2) – about .03%

9 Remember radiant energy?
Comes from the sun In many forms Represented by the electromagnetic spectrum! When it comes in contact with the ionosphere it can often create light shows called _________________. auroras


11 Assignment! Draw the atmosphere on your own! You will need:
Large paper Colored pencils To label each layer Draw an arrow at the bottom pointing to the right and label it temperature Draw an arrow to the left side pointing up and label it altitude Add ground Label each layer of the atmosphere (place the ozone layer where it goes in green) Draw a continuous line up your paper through each layer to indicate how the temperature changes with elevation Add in a picture in each layer to indicate what is special about it Turn in

12 Assignment! Layers of the atmosphere worksheet Turn in when finished

13 How does air move? In large pockets called air masses
Air masses move based on pressure High pressure systems move toward low pressure systems (high  low)

14 How do air masses affect weather?
They pick up the characteristics of the area in which they form They are very large (up to 1600km) making weather fairly consistent They carry temperature and moisture over the area where they are moving

15 How are air masses classified?
Overall temperature Where they formed 4 major types Polar –cold temps Tropical –warm temps Continental –dry air Maritime – wet air (high water vapor content) Arctic – very cold and dry Type of air mass will consist of 2 words

16 What kind of air masses influence North American weather?
Mostly influenced by maritime tropical (mT) and continental polar (cP) air masses

17 What are continental polar air masses like?
Cold dry winters Cool dry summers Not associated with precipitation Subject to the “lake effect” when crossing the Great Lakes Pick up moisture from the Great Lakes and may bring some precipitation

18 What are maritime tropical air masses like?
Warm and loaded with moisture Usually unstable Source of most precipitation in the Eastern US

19 What are maritime polar air masses like?
Come from the North Pacific Cold and dry turns into mild and humid Unstable Accompanied by low clouds and showers – snow in mountains

20 What are continental tropical air masses like?
Least influence in North America Hot and dry Only occasionally affect weather outside their source region

21 How do air masses move again?
Air pressure Exerted in all directions Object pushes back on the air with exactly the same force Measured using a barometer Typical air pressure: 1 atmosphere (ATM) 760 mm Hg (mercury) 980 millibars weather and air pressure

22 How does pressure affect air masses?
Air masses move from ____________  ____________ pressure Causes wind Unequal heating of Earth creates pressure differentials How does land heat up compared to water? Solar radiation is the ultimate source of wind 3 factors Pressure Coriolis effect friction high low

23 Assignment! Build a barometer You will need
A beaker A balloon A rubber band A sheet of notebook paper A pencil We’ll check your barometer daily and compare it to actual barometric pressure

24 Fronts Come back to back

25 How can we tell where air masses are going?
Look for pressure Red H is high pressure Blue L is low pressure Sometimes pressure is shown on maps in isobars, similar to isotherms Iso means equal Isobars are lines showing equal pressure

26 Changes in air pressure
High Pressure Low Pressure Type of phenomenon Weather system Determined by… Changes in air pressure Moving inward on isobars… Pressure Increases Pressure Decreases Density of air Higher Lower Representation on a map H (typically blue) L (typically red) Motion of air Clockwise, air sinks Counterclockwise, air rises Also known as… Anticyclone Cyclone Motion of air causes a zone of… Divergence Convergence Stability of atmosphere Stable Unstable

27 What is weather like in a high pressure system?
Sunny Clear Dry High day and low night temperatures Calm Dew and frost Fog and mist Stable sinking air

28 What is weather like in a low pressure system?
Cloudy Little sun Wet Mild temperatures for the time of year Windy Changeable weather Unstable rising air

29 What is the difference in a cyclone and an anticyclone?
Anticyclones Cyclones High pressure Air pushes together and sinks Spin Clockwise in northern hemisphere Counterclockwise in southern Low pressure Air rises and separates Spin Counterclockwise in northern Clockwise in southern

30 A C D B D

31 What is a front? The area where 2 air masses meet 4 kinds of fronts
Warm front Cold front Stationary front Occluded front Each front has a symbol Side of the line the symbols are on indicate direction of movement


33 What does each front mean?
Warm front – warm air is replacing cold air Cold front – cold air is replacing warm air Stationary front – air masses are not moving due to similar pressures Occluded front – warm air is pushed up due to cold air moving in from both directions front animation

34 What happens when cold and warm air meet?
Cold air sinks and warm air rises Warm air carries moisture Moisture condenses Clouds form Once air is saturated with moisture, precipitation in some form occurs

35 What happens before and after a warm front?
Cool or cold temps Falling barometer Increasing, thickening clouds Light to moderate precipitation Temp and dew point get closer together Warm and more humid Clearing clouds Rising barometer Temp and dew point are close



38 What is dewpoint? The temperature at which air is saturated enough for water to condense High dewpoint – temperature and dewpoint are close together Low dewpoint – temperature and dewpoint are far apart ALWAYS a dewpoint

39 What happens before and after cold fronts?
Warm Falling barometer Increasing clouds Short period of precipitation Temp and dew point close together Lower temps Rising pressure Showers then clearing skies Temp and dewpoint get further apart



42 What to expect from a stationary front?
Changing winds and temperatures when crossing from one side of the front to the other Similar pressure in air masses keeps them from moving

43 What can you expect from an occluded front?
Developing cyclones usually have a warm front and a faster moving cold front to wrap around them Occluded fronts form when cold air catches up to a warm front that is trapped behind a cold front already in place Change in temp, dewpoint, or wind possible jet stream

44 Assignment! Predicting weather Edheads weather prediction
We’ll do this as a group

45 Assignment! Complete the forecasting weather map worksheet
Put in the box when you are finished

46 Clouds How they form and what they mean

47 What happens as water evaporates?
Humidity – the amount of water in the air Amount of water vapor increases = higher humidity Air pressure increases as amount of water vapor increases Air is saturated when water entering air = water returning to surface Warm air contains more vapor than cold air

48 How is humidity measured?
Using a hygrometer Relative humidity – ratio of actual amount of water in the air compared to the amount of water air can hold at that temperature and pressure If amount of water vapor is constant, what will happen to the humidity if you raise the temperature? Lower it?


50 So how do clouds form? Temperature can change without heat input or loss These changes are called adiabatic temperature changes Happens when air is compressed or expanded Expansion cools Compression warms

51 What happens to air and vapor as it rises?
Overall, air resists lifting 4 factors make air light enough to be lifted Oographic lifting Frontal wedging Convergence Localized convective lifting

52 What is oographic lifting?
Elevated terrain blocks air from moving forcing it to go up and over Causes the rainshadow effect Wettest places on the windward side of mountain Lifting air reaches dew point and condenses  clouds form  air is pushed higher and forced to release moisture as precipitation By the time air gets to the other side of the mountain the moisture has mostly been lost


54 What is frontal wedging?
Air masses collide in flatter areas Area between two air masses is a front Cooler air sinks and warmer air rises  condenses  forms clouds

55 Brief Review What is a front?
What are the 4 different types of fronts? Draw each front as it appears on a weather map. How does weather change as each front moves through?

56 What is convergence? Air in lower atmosphere collides together and is forced upward Air converging from 2 different directions must go somewhere, down is not an option Example Ocean winds blow toward the shore In Florida, this happens on both sides of the state so air flows together Produces many afternoon storms

57 What is localized convective lifting?
Due to unequal heating of Earth’s surface Causes pockets of air to be warmer than surrounding air Example: parking lots Warm air will rise creating thermals Birds and hang-gliders use these to glide higher with less energy Warm air rises  reaches dewpoint  clouds form

58 Assignment! Answer questions 1-7 on page 516 in your textbook
Use the chapter and your note sheets to help you answer the questions Turn in when you are finished

59 What is the difference in stable and unstable air?
Air is forced to rise and its temperature is lowered by expansion Cooler air sinks to its original position – stable If it does not sink to its original position – unstable Bad weather stable vs. unstable air

60 What’s the difference in stable and unstable air rising?
Stable air resists vertical movement but some factors force it to rise What are the 4 things that can make air rise? When stable air rises – clouds are widespread and thin Unstable air rising – clouds are thick and cover a small area thunderstorms

61 What makes air density different?
Temperature Warm – rises Like hot air balloons Cool – sinks Elevation High – air is less dense Particles far apart Low – air is more dense Particles close together

62 How does water condense to make clouds?
Usually a surface for cooling water to condense on Bacteria Small particles – dust, soot, particles of pollution Small surfaces are called condensation nuclei

63 Assignment! Hurricane sheet
Read through the packet and answer the questions Honor’s - choose 1 of the following write a realistic fictional story about a hurricane or tornado Create a tri-fold brochure on hurricane safety Use graph paper to create a bar graph showing the 20 strongest hurricanes on record

64 Cloud types

65 How are clouds categorized?
Based on height and form 3 main types Stratus Cumulus Cirrus

66 What are cirrus clouds? High, white, and thin
Patches or wispy fibers – may appear feathery 3 types Cirrus Cirrostratus – flat layers Cirrocumulus – fluffy masses Usually signify nice weather When replaced by cirrocumulus clouds and increased coverage – sign of bad weather approaching

67 What are cumulus clouds?
Piles of clouds Rounded cloud masses Normally with flat base in domes or towers middle clouds 2 other types of middle clouds Alto – prefix meaning middle Altocumulus – rounded masses that are larger and more dense than cirrocumulus Altonimbus – uniform white – greyish sheet, sun or moon visible as a bright spot Often snow or rain accompany these

68 What are stratus clouds?
Low clouds Sheets or layers No distinctive cloud masses 2 other types of low clouds Stratocumulus – long parallel with a rolling bottom Nimbostratus – main precipitation markers form in stable conditions

69 Are there any clouds that reach through several cloud layers?
Low bottoms with tops that reach into the high regions From unstable air Cumulonimbus Usually grown from cumulus clouds and signify storms

70 Do clouds ever touch the ground?
Fog is a cloud with its base on or near the ground No physical difference with any other cloud Difference is in placement and formation Usually the result of warm air moving over a cooled surface Can form when cool air moves over warm water – steamy appearance Forms when enough water vapor brings about saturation

71 How does precipitation form in cold clouds?
Supercooling and supersaturation – Bergeron process Cloud droplets do not freeze at 0°C, instead it must be about -40°C - supercooled Freezing nuclei cause water droplets to freeze Greater than 100% humidity – supersaturated Ice and water cannot exist together in clouds Evaporating water quickly produces snowflakes or ice

72 How does precipitation form in warm clouds?
Rainfall in clouds is well below freezing – even in tropics Collision – coalescence process – water absorbing particles remove moisture forming large droplets Drops collide and mix with smaller slower droplets

73 Does ice form in warm clouds?
Hail Forms in cumulonimbus clouds Starts small Updrafts carry hail through supercooled layers repeatedly Forms layers

74 Assignment! Cloud types and formation worksheet
Turn in when you finish

75 Climate and Climate Change
Something wicked this way comes...

76 Group Assignment! Each group will be assigned 2 topics Create a poster
1 natural source of climate change 1 human induced source of climate change Create a poster Tell what each source is What do they do to cause climate change 3 ways to counteract the effects of natural climate change 3 ways to reduce impact from the human induced problems What additional problems does this cause for the biosphere (at least 2) Due the day before test day (Dec 19)

77 What is the difference in climate and weather?
State of the atmosphere at a given time What atmospheric layer does this happen in? Climate Average weather patterns over a LONG period of time

78 How is climate classified?
Köppen classification 3 major climate systems Temperate Tropical polar

79 What is a temperate climate?
Moderate changes between seasons Distinct summers and winters Between 20 and 65 degrees north and south of the equator

80 What is a tropical climate?
Constant warm temperatures with high precipitation Around the equator between 0 and 25 degrees

81 What is a polar climate? Constant cold temperatures
24 hours of daylight in summer and 24 hours of dark in winter Treeless tundras or glaciers

82 How are humans causing climate change?
Burning fossil fuels and cutting down trees increases gases such as carbon dioxide, carbon monoxide, and ammonia in the atmosphere These gases act as a blanket and retain radiation from the sun in the form of heat – the greenhouse effect Gases responsible for this effect are greenhouse gases Some CO2 is necessary to keep Earth warm enough for life greenhouse effect - Futurama

83 Isn’t CO2 absorbed by the ocean?
Yes by diffusion Some of this carbon reacts with water to form weak carbonic acid Makes the shells of marine creatures thinner Increases vulnerability Decreases our food source How will increased CO2 affect sea level?

84 Are there natural phenomena that cause climate change?
Yes Sunspots Volcanic activity El Niño and La Niña Shifts in orbit Naturally fluctuating CO2 levels

85 How do sunspots cause climate change?
Controversial Sunspots are dark spots on the surface of the sun Increase in sunspots correlates to an increase in temperature and vise versa Spots are cooler spots in the sun and area around them warms to make up for the difference Less spots = more solar wind = more clouds = less sun hitting Earth

86 How do volcanic eruptions cause climate change?
Massive amounts of gas, ash, and aerosol released into the atmosphere Ash falls rapidly Gas stays in the upper atmosphere Sulfer dioxide reflects light back into space – causes cooling CO2 causes warming – greenhouse effect

87 How do El Niño and La Niña influence climate change?
What are trade winds like in a typical year on the western coast of continents? What do these winds do to warm water? Temporary change in Pacific Ocean around the equator Affects Northern hemisphere’s winter Area of typical thunderstorms moves eastward Due to a reduction of upwelling in the eastern ocean

88 What about La Niña? Opposite of El Niño
Caused by cooler surface temperatures

89 What are the results of El Niño?
Wet winters in southeast US Droughts in Indonesia and Australia Weaker winds to further reduce upwelling and cause El Niño to grow – positive feedback Irregular but generally happen every 3-7 years

90 How does a shift in Earth’s orbit produce climate change?
What is precession? How does it affect climate? What is nutation? How does it affect climate? Eccentricity – distance between Earth and Sun Varies slightly as the barycenter of the sun changes position Long term effects – triggers beginnings and ends of ice ages

91 How does CO2 fluctuation change climate?
Higher levels of CO2 contribute to the greenhouse effect Higher levels = higher temperatures Natural as well as human influenced Volcanoes and burning fossil fuels Seasonal – higher levels in the winter… why?

92 Do gases do anything else to affect climate?
Some dissolve easily in water to make acid rain Nitrogen oxide Sulfur dioxide Can be carried far by winds and affect areas far away from where it developed

93 Are there any other human affects on our atmosphere?
Chlorofluorocarbons (CFCs) – only created by humans, found in old aerosol cans (hairspray etc…) Destroy ozone 1 CFC can destroy thousands of ozone particles No longer used or made in America Created a large hole in ozone over Antarctica – conditions here have begun to improve

94 What are aerosols and what do they do?
Small particles suspended in the atmosphere In high amounts they can scatter sunlight and prevent it from reaching Earth Common in any aerosol can (hair spray, cool whip, can cheese etc…) Also natural – volcanoes, meteors

95 How is climate change affecting the biosphere?
If the climate warms faster than organisms can adapt to it they will become extinct Mass extinction if we lose many species within a few centuries Ecosystems will lose balance as organisms die Insects are able to migrate to higher elevations – mosquitos Agriculture will become difficult as weather warms and rains decrease

96 What can you do to stop climate change?
Decrease dependence on fossil fuels Walk or ride a bike Eat seasonal or locally grown produce Eat less meat Be energy efficient – turn off lights/water Choose renewable power Recycle – reduce – reuse Travel less Stay informed Stay involved Support and donate to politicians who are in favor for environmental regulations

97 Game board review Create a game board using each topic in the game board You will need at least 4 game pieces to play Incorporate spaces that will send you ahead or back in the game Example, land on a volcanic eruption and go back 5 spaces – land on wind turbines and go forward 5 spaces Lose a turn spaces – only get off if you answer a question etc… Question cards To be answered before you can move ahead in the game – give each card a number of spaces to go forward if answered correctly

98 Resources

99 Resources

100 Resources

Download ppt "Atmosphere Water and Air… the two essential elements on which life depends have become global garbage cans."

Similar presentations

Ads by Google