+ Visit NASA.gov + Advanced Search   + About the Server   + Animation List   + How to Use the Server   + RSS Feeds   + Podcasts   + Opportunities Previous Animation Next Animation Smithsonian Exhibit: Antarctic Ozone Sequence 1979 through 2004 NASA has been monitoring the status of the ozone layer through satellite observations since the 1970s, beginning with the TOMS sensors on the Nimbus satellites. The latest-generation ozone-monitoring technology, the Ozone Monitoring Instrument (OMI), is flying onboard NASA's Aura satellite. The ozone hole is not technically a 'hole' where no ozone is present, but is actually a region of exceptionally depleted ozone in the stratosphere over the Antarctic. The ozone hole begins to grow in August and reaches its largest area in depth in the middle of September to early October period. In the early years (before 1984) the hole was small because chlorine and bromine levels over Antarctica were low. Year-to-year variations in area and depth are caused by year-to-year variations in temperature. Colder conditions result in a larger area and lower ozone values in the center of the hole. This animation shows total ozone in the Antarctic region along with the maximum ozone depth and size since the earliest measurements of Earth Probe instrument on the TOMS satellite. This animation was created for an exhibit at the Smithsonium Museum. Data dropouts have been removed for the following times: 1998/12/14-31, 2002/08/03-11, 2003/11/28-2003/12/02. The minimum ozone recorded is 82.0 du on September 26, 2003. The maximum area of 29 million square kilometers (11.4 million square miles) occurred on September 9, 2000.    NASA has monitored changes in Antarctic ozone levels since 1979. In September 2002, the Antarctic ozone hole split into two parts. Duration: 4.2 minutes Available formats:   320x240 (29.97 fps) MPEG-1   49 MB   640x480 (29.97 fps) MPEG-1   105 MB   720x480 (29.97 fps) MPEG-2   185 MB   720x486 (30 fps) Frames   320x240     JPEG         73 KB   160x80       PNG           30 KB   80x40         PNG           8 KB   320x240 (29.97 fps) X-FLV       7 MB How to play our movies    Total ozone color bar in Dobson units Available formats:   320 x 100         PNG         2 KB    Plots of the historical southern hemisphere daily ozone hole minima. Available formats:   792 x 611         JPEG   102 KB   320 x 246         PNG       29 KB Animation Number: 3264 Completed: 2005-07-14 Animators: Lori Perkins (NASA/GSFC) (Lead)   Stuart A. Snodgrass (GST) Scientists: Paul Newman (NASA/GSFC)   Ernest Hilsenrath (NASA/GSFC)   Richard McPeters (NASA/GSFC) Platforms/Sensors/Data Sets: Earth Probe/TOMS   Earth Probe/TOMS/Ozone Depth   Earth Probe/TOMS/Ozone Size Data Collected: 1996/7/26 - 2004/12/31 Series: Ozone Keywords: SVS >> Antarctic DLESE >> Atmospheric science SVS >> Ozone SVS >> Ozone Hole     Please give credit for this item to: NASA/Goddard Space Flight Center Scientific Visualization Studio Back to Top + Privacy Policy and Important Notices + Reproduction Guidelines NASA Official: Content Contact: Curator: