What is weather? Weather is the condition of the Earth’s atmosphere at a particular time and place. –Example: What is the weather outside right now? –Not an Example – What is North Carolina weather in the fall?
Climate An AVERAGE of weather conditions over a long period of time
What is the Atmosphere? Remember! Atmos – Vapor Sphere – Ball The Atmosphere is a layer of gases that surround Earth or any planet.
Why is the atmosphere important: 1.We need the gases for survival. 2.It prevents the earth from being hit by meteoroids 3.Heats the water on earth to keep most of it in liquid form 4.Protects us from the
What keeps the atmosphere in place? Gravity hold our atmosphere to the earth! The atmosphere is attracted to the center of the earth like all other objects
What is in our atmosphere? Gases (dry air) 1.Nitrogen 78% - N 2 2.Oxygen 21% - O 2
What else is in the atmosphere? 3.Carbon Dioxide - less than 1% - CO 2 4.Trace Gases – less than 1% of argon, helium, methane, krypton, ozone & hydrogen
Wet Gases Water Vapor – Water in the form of a gas The amount of water vapor varies from 0 – 5%. Example – Desert – O% Example – Rainforest – 5 %
What does CO 2 do to the atmosphere? It heats our atmosphere! It takes very little! This is why we are concerned about the greenhouse effect and global warming. But more on that later…
What was the early earth like? Little or no oxygen! CO 2 was the most abundant gas in our atmosphere Very high temperatures No living creatures
What changed the earth’s atmosphere? After creation, the big bang, or someone sprinkled some magic dust… The first life forms appeared… Bacteria that takes in CO 2 and gives off oxygen as waste This made the earth a cooler place where evolution could occur
Layers of the atmosphere Jigsaw, picture graph, temperature inversions
Is it OK to be dirty? YES!! (to a certain degree) When water vapor condenses to form clouds it must have something to stick to in the atmosphere. Natural pollutants are just the thing that clouds need.
Is some pollution OK? YES!! Salt Spray Mold Pollen Erosion Forest Fires Dust Storm Animal Dander Volcanic Eruption These are all Natural Pollutants.
BUT SOME IS NOT!! Un- natural Pollution = Human Activities ½ - motor vehicles ¼ - factories and power plant ¼ - farming, construction, burning fossil fuels (wood and coal)
The increase of un-natural pollution is causing the following three problems: 1.Smog 2.Acid Rain 3.Greenhouse Effect/Global Warming
Smog = Smoke + Fog London Smog – coal particles + Water Vapor in the humid air in England Photochemical Smog - sunlight + chemicals in the air released by motor vehicles and factories
Acid Rain Chemicals called oxides mix with water in the air to make the rain acidic (Draw this) Precipitation carries acid from the air to trees, water sources, and buildings
ACID RAIN Nitrogen Oxide in atmosphere + water Turns into NITRIC ACID Or Sulfur oxide in atmosphere + water Turns into SULFURIC ACID Precipitation carries acid from air to trees, lakes and buildings!!
The greenhouse effect the rise in temperature that the Earth experiences because certain gases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane, for example) trap energy from the sun. The greenhouse effect alone is a natural event…however…
Increased Green House gases are causing global warming… http://epa.gov/climatechange/kids/global_ warming_version2.htmlhttp://epa.gov/climatechange/kids/global_ warming_version2.html
NOW WHAT? Pollution Restrictions by US Government Factories install filters on smokestacks Higher standards for clean cars More affordable and reliable Hybrid/electric vehicles