2 Natural Processes that Change Climate Volcanic EruptionsThe presence of volcanic ash, dust, and aerosols in the air increase the amount of solar radiation that is reflected back into space.This causes Earth’s lower atmosphere to cool.
3 Eruption of the Eyjafjallajökull volcano in Iceland video. What are the possible affects on weather in the area?
4 Natural Processes that Change Climate Ocean CirculationsChanges in ocean circulation also can result in short-term climate fluctuationEX: El Niño
5 Natural Processes that Change Climate Solar ActivityThe formation of sunspots appears to correspond with warm periods in Europe and North AmericaSunspot link
7 Natural Processes that Change Climate Earth MotionsGeographic changes in Earth’s land and water bodies cause changes in climateChanges in the shape of Earth’s orbit and the tilt of Earth’s axis affect global climates.
8 Natural Processes that Change Climate CO2 FluctuationsChanges in plant growth ratesCO2 levels fall during the growing season and rise in the winter
9 Natural Processes that Change Climate Ocean AcidificationDecrease in the ocean’s pH levels in the ocean. CO2 is absorbed by the ocean and forms carbonic acid.Coral Reefs: High levels of CO2 negatively affects corals making their shells.50% of coral reefs have been destroyed
10 Human Impact on Climate Changes The Greenhouse EffectIs a natural warming of both Earth’s lower atmosphere and Earth’s Surface.Major Gases: Water vapor and Carbon dioxideMakes life as we know it possible on Earth
11 Check for Understanding? 1. Which natural process causes Earth's lower atmosphere to cool?2. What corresponds with warm periods in Europe and North America?3. What decreases in the ocean to cause ocean acidification?
12 Human Impact on Climate Changes The Greenhouse Effect Cont.Humans have added more greenhouse gases to the atmosphere in the past 200 years.Greenhouse Effect clipNASA's link
13 Human Impact on Climate Changes Global WarmingAs a result of increases in CO2 as well as other greenhouse gases, global temperatures have increased.Affects multiple natural events like the weather and melting the polar ice caps.
14 Human Impact on Climate Changes Global WarmingGlobal Warming clipNASA Global Warming Facts
15 Check For Understanding 1. Compare and contrast the greenhouse effect and global warming.2. What is the relationship between burning fossil fuels and climate change? Explain.
16 Agree or Disagree?5. ____ There are no processes that can change climate.6. ____The Greenhouse effect is the natural warming of Earth’s lower atmosphere and surface.7. ____ Global warming is the result of increased greenhouse gases, like CO2, being released by humans.
17 El Nino verses La Nina El Niño La Niña Trade winds weaken Warm ocean water replaces offshore cold water near South AmericaIrregular intervals of three to seven yearsWetter than average winters in NCLa NiñaNormal conditions between El Nino eventsWhen surface temperatures in the eastern Pacific are colder than averageThe southern US is usually warmer and dryer in climate
19 El Nino Southern Oscillation: ENSO Occurs: three to seven yearsThe warm countercurrents in the Pacific become unusually strong and replace normally cold offshore waters with warm equatorial waters.Characterized by unusually warm ocean surface temperatures
20 Think about it…Brainstorm what negative effects you think would be likely to accompany the rise in temperature, including natural disasters.Think about the impacts on weather…Droughts, floods, mudslides, hurricanes, typhoons…El Nino Video
21 Cause and Effect El Nino Cause: Develop when easternly winds weaken. Warm surface air creates more thunderstorms over the central and eastern pacificEffect: Subtropical jet stream is energized, storms lead to frequent mudslides in SO. CAL. And a wet winter in the Southern US
22 Cause and Effect La Nina Cause: Stronger than normal trade winds push warm water farther westEffect: Polar jet stream is amplified, brings cold air to northwest. Subtropical jet stream moves northward bringing moisture, heavy rains, and mountain snows to the Pacific Northwest.El Nino and La Nina Visualization