NASA | Why Is the Ozone Hole Getting Smaller?
Δημοσιεύτηκε στις 7 Νοε 2014
For more information:
http://www.nasa.gov/content/goddard/2...
The
Antarctic ozone hole reached its annual peak size on Sept. 11,
according to scientists from NASA and the National Oceanic and
Atmospheric Administration (NOAA). The size of this year’s hole was 24.1
million square kilometers (9.3 million square miles) — an area roughly
the size of North America.
With the increased atmospheric
chlorine levels present since the 1980s, the Antarctic ozone hole forms
and expands during the Southern Hemisphere spring (August and
September). The ozone layer helps shield life on Earth from potentially
harmful ultraviolet radiation that can cause skin cancer and damage
plants.
The Montreal Protocol agreement beginning in 1987
regulated ozone depleting substances, such as chlorine-containing
chlorofluorocarbons and bromine-containing halons. The 2014 level of
these substances over Antarctica has declined about 9 percent below the
record maximum in 2000.
“Year-to-year weather variability
significantly impacts Antarctica ozone because warmer stratospheric
temperatures can reduce ozone depletion,” said Paul A. Newman, chief
scientist for atmospheres at NASA's Goddard Space Flight Center in
Greenbelt, Maryland.
Scientists are working to determine if the
ozone hole trend over the last decade is a result of temperature
increases or chorine declines. An increase of stratospheric temperature
over Antarctica would decrease the ozone hole’s area.
This video is public domain and can be downloaded at:
http://svs.gsfc.nasa.gov/cgi-bin/deta...
Like our videos? Subscribe to NASA's Goddard Shorts HD podcast:
http://svs.gsfc.nasa.gov/vis/iTunes/f...
Or find NASA Goddard Space Flight Center on Facebook:
http://www.facebook.com/NASA.GSFC
Or find us on Twitter:
http://twitter.com/NASAGoddard
http://www.nasa.gov/content/goddard/2...
The
Antarctic ozone hole reached its annual peak size on Sept. 11,
according to scientists from NASA and the National Oceanic and
Atmospheric Administration (NOAA). The size of this year’s hole was 24.1
million square kilometers (9.3 million square miles) — an area roughly
the size of North America.
With the increased atmospheric
chlorine levels present since the 1980s, the Antarctic ozone hole forms
and expands during the Southern Hemisphere spring (August and
September). The ozone layer helps shield life on Earth from potentially
harmful ultraviolet radiation that can cause skin cancer and damage
plants.
The Montreal Protocol agreement beginning in 1987
regulated ozone depleting substances, such as chlorine-containing
chlorofluorocarbons and bromine-containing halons. The 2014 level of
these substances over Antarctica has declined about 9 percent below the
record maximum in 2000.
“Year-to-year weather variability
significantly impacts Antarctica ozone because warmer stratospheric
temperatures can reduce ozone depletion,” said Paul A. Newman, chief
scientist for atmospheres at NASA's Goddard Space Flight Center in
Greenbelt, Maryland.
Scientists are working to determine if the
ozone hole trend over the last decade is a result of temperature
increases or chorine declines. An increase of stratospheric temperature
over Antarctica would decrease the ozone hole’s area.
This video is public domain and can be downloaded at:
http://svs.gsfc.nasa.gov/cgi-bin/deta...
Like our videos? Subscribe to NASA's Goddard Shorts HD podcast:
http://svs.gsfc.nasa.gov/vis/iTunes/f...
Or find NASA Goddard Space Flight Center on Facebook:
http://www.facebook.com/NASA.GSFC
Or find us on Twitter:
http://twitter.com/NASAGoddard
Κατηγορία
Άδεια
- Τυπική άδεια YouTube
ANAΡΤΗΣΗ ΑΠΟ ΤΟ YOUTUBE 22/11/2014
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