JPL Satellite Instrument Sees First Direct Proof of Ozone Hole Recovery

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Free.Get all the latest Pasadena news, more than 10 fresh stories daily, 7 days a week at 7 a.m. Community News ShareShareTweetSharePin it faithfernandez More » ShareTweetShare on Google+Pin on PinterestSend with WhatsApp,Virtual Schools PasadenaHomes Solve Community/Gov/Pub SafetyCitizen Service CenterPASADENA EVENTS & ACTIVITIES CALENDARClick here for Movie Showtimes Name (required)  Mail (required) (not be published)  Website  Herbeauty7 Tips To Rejuvenate Winter Dry, Chapped LipsHerbeautyHerbeautyHerbeauty10 Brutally Honest Reasons Why You’re Still SingleHerbeautyHerbeautyHerbeauty9 Of The Best Family Friendly Dog BreedsHerbeautyHerbeautyHerbeautyThese Are 15 Great Style Tips From Asian WomenHerbeautyHerbeautyHerbeauty10 Reasons Why Selena Gomez Has Billions Of FansHerbeautyHerbeautyHerbeautyHe Is Totally In Love With You If He Does These 7 ThingsHerbeautyHerbeauty Science and Technology JPL Satellite Instrument Sees First Direct Proof of Ozone Hole Recovery From JPL/NASA Published on Thursday, January 4, 2018 | 5:01 pm Subscribe Community News Top of the News center_img First Heatwave Expected Next Week Make a comment More Cool Stuff Your email address will not be published. Required fields are marked * Business News Pasadena’s ‘626 Day’ Aims to Celebrate City, Boost Local Economy Using measurements from NASA’s Aura satellite, scientists studied chlorine within the Antarctic ozone hole over the last several years, watching as the amount slowly decreased. Credit: NASA’s Goddard Space Flight Center/Katy MersmannFor the first time, scientists have shown through direct observations of the ozone hole by a satellite instrument, built by NASA’s Jet Propulsion Laboratory in Pasadena, California, that levels of ozone-destroying chlorine are declining, resulting in less ozone depletion.Measurements show that the decline in chlorine, possibly resulting from an international ban on chlorine-containing human-produce chemicals called chlorofluorocarbons (CFCs), has resulted in about 20 percent less ozone depletion during the Antarctic winter than there was in 2005 — the first year that measurements of chlorine and ozone during the Antarctic winter were made by NASA’s Aura satellite.“We see very clearly that chlorine from CFCs is going down in the ozone hole, and that less ozone depletion is occurring because of it,” said lead author Susan Strahan, an atmospheric scientist from NASA’s Goddard Space Flight Center in Greenbelt, Maryland.CFCs are long-lived chemical compounds that eventually rise into the stratosphere, where they are broken apart by the Sun’s ultraviolet radiation, releasing chlorine atoms that go on to destroy ozone molecules. Stratospheric ozone protects life on the planet by absorbing potentially harmful ultraviolet radiation that can cause skin cancer and cataracts, suppress immune systems and damage plant life.Two years after the discovery of the Antarctic ozone hole in 1985, nations of the world signed the Montreal Protocol on Substances that Deplete the Ozone Layer, which regulated ozone-depleting compounds. Later amendments to the Montreal Protocol completely phased out production of CFCs.Past studies have used statistical analyses of changes in the ozone hole’s size to argue that ozone depletion is decreasing. This study is the first to use measurements of the chemical composition inside the ozone hole to confirm that not only is ozone depletion decreasing, but that the decrease is caused by the decline in CFCs.The study was published Jan. 4 in the journal Geophysical Research Letters.The Antarctic ozone hole forms during September in the Southern Hemisphere’s winter as the returning Sun’s rays catalyze ozone destruction cycles involving chlorine and bromine that come primarily from CFCs.To determine how ozone and other chemicals have changed year to year, scientists used data from JPL’s Microwave Limb Sounder (MLS) aboard the Aura satellite, which has been making measurements continuously around the globe since mid-2004. While many satellite instruments require sunlight to measure atmospheric trace gases, MLS measures microwave emissions and, as a result, can measure trace gases over Antarctica during the key time of year: the dark southern winter, when the stratospheric weather is quiet and temperatures are low and stable.The change in ozone levels above Antarctica from the beginning to the end of southern winter — early July to mid-September — was computed daily from MLS measurements every year from 2005 to 2016. “During this period, Antarctic temperatures are always very low, so the rate of ozone destruction depends mostly on how much chlorine there is,” Strahan said. “This is when we want to measure ozone loss.”They found that ozone loss is decreasing, but they needed to know whether a decrease in CFCs was responsible. When ozone destruction is ongoing, chlorine is found in many molecular forms, most of which are not measured. But after chlorine has destroyed nearly all the available ozone, it reacts instead with methane to form hydrochloric acid, a gas measured by MLS. “By around mid-October, all the chlorine compounds are conveniently converted into one gas, so by measuring hydrochloric acid we have a good measurement of the total chlorine,” Strahan said.Nitrous oxide is a long-lived gas that behaves just like CFCs in much of the stratosphere. The CFCs are declining at the surface but nitrous oxide is not. If CFCs in the stratosphere are decreasing, then over time, less chlorine should be measured for a given value of nitrous oxide. By comparing MLS measurements of hydrochloric acid and nitrous oxide each year, they determined that the total chlorine levels were declining on average by about 0.8 percent annually.The 20 percent decrease in ozone depletion during the winter months from 2005 to 2016 as determined from MLS ozone measurements was expected. “This is very close to what our model predicts we should see for this amount of chlorine decline,” Strahan said. “This gives us confidence that the decrease in ozone depletion through mid-September shown by MLS data is due to declining levels of chlorine coming from CFCs. But we’re not yet seeing a clear decrease in the size of the ozone hole because that’s controlled mainly by temperature after mid-September, which varies a lot from year to year.”Looking forward, the Antarctic ozone hole should continue to recover gradually as CFCs leave the atmosphere, but complete recovery will take decades. “CFCs have lifetimes from 50 to 100 years, so they linger in the atmosphere for a very long time,” said Anne Douglass, a fellow atmospheric scientist at Goddard and the study’s co-author. “As far as the ozone hole being gone, we’re looking at 2060 or 2080. And even then there might still be a small hole.”To read the study, visit http://onlinelibrary.wiley.com/doi/10.1002/2017GL074830/abstractFor more on MLS, visit https://mls.jpl.nasa.gov/index-eos-mls.php EVENTS & ENTERTAINMENT | FOOD & DRINK | THE ARTS | REAL ESTATE | HOME & GARDEN | WELLNESS | SOCIAL SCENE | GETAWAYS | PARENTS & KIDS Home of the Week: Unique Pasadena Home Located on Madeline Drive, Pasadenalast_img

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