Sentences with phrase «ozone hole»

Thus, continued release of excess nitrogen to the environment will probably accelerate climate change with time and will also lead to the formation of more ozone holes in this century.

They claim to have discovered an important process underlying the growing ozone hole over the southern hemisphere.

These regions are more commonly known as ozone holes.

Understanding the mechanism of ozone depletion should help scientists predict when ozone holes will grow or shrink, he adds.

This past winter has seen the creation of the largest arctic ozone hole on record.

Still, arctic ozone levels fell during most winters in the 1990s, making researchers worry that a northern ozone hole might appear.

Therefore, our measurements contribute to a better monitoring of the ozone layer and ozone hole development.

Compared to the 1991 - 2014 period, the 2015 ozone hole average area was the fourth largest.

In fact the average concentration of ozone is everywhere lower than the value that used to define the present ozone hole.

Since 2000, the average size of the Antarctic ozone hole in September has shrunk by about 4.5 million square kilometers, an area larger than India, researchers report online June 30 in Science.

Learn about the state of ozone hole over Antarctica and the risks this poses to scientific research teams, as well as how certain aerosols lead to cloud formation.

Conditions are ripe for losses to surpass a record Arctic ozone hole observed in the spring of 2011, he adds.

The similar, but more pronounced, dynamics are responsible for the more infamous ozone hole above Antarctica.

The death of the Grand Banks has done for the fishing industry what the Antarctic ozone hole did for the chemicals industry: scared everyone out of their complacency.

From Zürich, lead author Dr. William Ball says Earth's ozone shield against harmful radiation continues to weaken — despite an improvement of big ozone holes over the Poles.

Perlwitz J., S. Pawson, R. L. Fogt, J. E. Nielsen and W. Neff (April 2008): Impact of stratospheric ozone hole recovery on Antarctic climate.

Instead, changes in the South Pole's ozone hole from year - to - year are likely the result of natural variations in wind patterns, researchers said here Wednesday (Dec. 11) in a press conference at the annual meeting of the American Geophysical Union.

If you think you know why NASA did not report the discovery of the Antarctic polar ozone hole in 1984 before the publication of Farman et al in May 1985, you might well be wrong.

Every year, a major ozone hole opens up over Antarctica, where winters are colder and polar vortices are stronger and more stable than over the Arctic.

Also from the late 1970s through the 1990s, in the Southern Hemisphere the Antarctic ozone hole developed and deepened.

Our modeling experiments have shown that the S.H. ozone hole appears to produce a more positive phase of the NAM.

The largest ozone hole ever seen has opened up over Antartica, a sign that ozone - depleting gases churned out years ago are just now coming to their peak, NASA scientists reported September 8, 2000.

Records in depth and size haven't occurred during the same years (the largest ozone hole occurred in 2006), but the long - term trend in both characteristics is consistent: from 1980 through the early 1990s, the hole rapidly grew in size and depth.

The Antarctic ozone hole forms and expands during the Southern Hemisphere spring (August and September) because of the high levels of chemically active forms of chlorine and bromine in the stratosphere.

Volcanic eruptions have episodically interfered with healing, particularly during 2015, when a record October ozone hole occurred after the Calbuco eruption.»

Tedesco warns that as the Antarctic ozone hole heals in the coming decades, the winds that seal the continent from warm air will weaken and it will become much warmer in summer.

The team found that the September ozone hole has shrunk by more than 4 million square kilometers — about half the area of the contiguous United States — since 2000, when ozone depletion was at its peak.

The same dynamics create the infamous ozone hole over Antarctica.

The severity and duration of the Antarctic ozone hole also increases due to greenhouse gas - induced stratospheric cooling over the coming decades, although ozone there is already so depleted that any additional losses are relatively small.

First sighted over Antarctica in the mid-1980s, the so - called ozone hole led to an international ban on CFCs in 1987.

T. Deshler of the University of Wyoming and an American - Italian team say that a year ago, aerosol from Mount Hudson, which erupted in Chile in August 1991, worsened the springtime ozone hole above the Antarctic.

Twenty years after the Montreal Protocol came into effect to regulate substances that deplete the ozone layer, the annual ozone hole above Antarctica shows no signs of recovery.

Dr. Solomon, who won a National Medal of Science in 1999 for linking synthetic chemicals to the seasonal ozone hole over Antarctica, nonetheless chose that course in 2002.

A kind of global ozone hole developed (which would also have helped kill off whatever land animals survived the fire...)

Have you seen the NASA Earth Observatory posting on the predicted effects of the closing of the southern hemisphere ozone hole?

The effect of high UV on conifers and potentially other trees also suggests caution today in introducing chemicals that deplete Earth's ozone layer, which has yet to recover after a global ban on chlorofluorocarbon refrigerants in the 1980s instituted after ozone holes developed over the poles.

The model helped explain anomalously large ozone holes like the one in October 2015 — which was largely due to the eruption earlier that year of the Calbuco volcano in southern Chile.

The 2015 Antarctic ozone hole area was larger and formed later than in recent years, said scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA).

«While the current ozone hole is larger than in recent years, the area occupied by this year's hole is consistent with our understanding of ozone depletion chemistry and consistent with colder than average weather conditions in Earth's stratosphere, which help drive ozone depletion,» said Paul A. Newman, chief scientist for Earth Sciences at NASA's Goddard Space Flight Center in Greenbelt, Maryland.

Ozone hole production requires temperatures below ~ 197K.

The deepest ozone hole occurred in 1994, when concentrations fell to just 73 DU on September 30.

Hot Sun There is now a massive ozone hole in the Northern Hemisphere (and a rapidly growing one in Southern Hemisphere).