OzoneDepletionDataAnalysis5ELabDistanceLearning-STUDENT-1

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Ozone Depletion Data Analysis 5E Lab Ozone is three oxygen atoms, O 3 . In the troposphere it is an air pollutant, but in the stratosphere, it protects life from harmful UV rays. Engage When and how do you protect yourself from the sun? Why is it important to do this? Today you will learn about the ozone “hole” which is ozone depletion or thinning in the stratosphere. Follow the instructions on this document to learn about stratospheric ozone depletion. Explore Where is the Ozone Hole? Go to https://www.nesdis.noaa.gov/content/ozone - hole - over - antarctica - reaches - annual - maximum The amount of stratospheric ozone is measured in Dobson Units. When Dobson Units dip below 220, it is said to have a “hole”. 1. What color is represented by less than 220 Dobson Units? 2. Where on the planet is the “hole” found? 3. How large was the peak or maximum “hole” in 2015? 2015 was unusual as this maximum was later in the year than normal. This next website will help us determine which months have ozone depletion. Go to: https://www.nnvl.noaa.gov/view/#OZON and click “monthly”. Note the slide bar and the rewind and forward buttons. These will be helpful. Important! Shrink the map a little so you can see all of Antarctica. How to do this will vary by computer. On a laptop or touchscreen, you can pinch your fingers together on the mousepad or screen. 4. First, we will look at the 1980s by choosing one year that is typical of that decade in terms of ozone. Use the slide bar or buttons to fast forward to 1986 and click the play button: Observe which months have red in the Antarctic. Which months have the ozone hole? ©StrategicScience
5. Take a screenshot of September 1986 and paste below. You will need to analyze these screenshots later. You can use the camera icon on the site, screenshot on your keyboard or a snipping tool. Screenshot of September 1986 6. Fast forward to 1996. Which months in 1996 have an ozone hole over Antarctica? 7. Take a screenshot of September 1996 and paste below. You will need to analyze these screenshots later. You can use the camera icon on the site, screenshot on your keyboard or a snipping tool. Screenshot of September 1996 8. Fast forward to 2006. Which months have an ozone hole over the Antarctic? 9. Take a screenshot of September 2006 and paste below. You will need to analyze these screenshots later. You can use the camera icon on the site, screenshot on your keyboard or a snipping tool. Screenshot of September 2006 ©StrategicScience
10. Look at your screenshots for 1986, 1996 and 2006. What do you observe? 11. Where else do you notice ozone depletion on the planet starting in the 2000s? 12. Fast forward to the most recent data and let that year run. What do you observe about ozone from last year? How does it compare to previous decades? Write a Claim: Where on Earth is ozone depletion the worst? In which months is ozone depletion the worst? Claim: What causes the Ozone Hole? Next, you will learn about the chemicals that cause ozone depletion. Go to: https://www.esrl.noaa.gov/gmd/hats/hats_chemicals2.html This is a website by NOAA, the National Oceanic and Atmospheric Administration, which records data from all over the world. This website gives us real-time and past data for atmospheric gases that cause ozone depletion and climate change (which are NOT related). Today, we will focus on ozone depletion. 13. Look at the various forms of CFCs and compounds with Cl. List several things CFCs are used for. Long-term global trends of atmospheric trace gases Go to https://www.esrl.noaa.gov/gmd/hats/data.html 14. Look at the different forms of CFCs. What is the overall trend of most of these gases since 1980? When did they increase and decrease? Read the first two paragraphs of this article to find out why there is this trend: https://www.rapidtransition.org/stories/back - from - the - brink - how - the - world - rapidly - sealed - a - deal - to - save - the ozone - layer/ 15. Why were CFCs banned? ©StrategicScience
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