Sentences with phrase «ozone loss in»

Lu's predictions for increased polar ozone loss in 2008/2009 as a function of the low solar activity (and therefore higher CR flux) did not come to pass.

This week, it's a paper on bromine - and iodine - mediated ozone loss in marine boundary layer environments (see a good commentary here).

There were measurements in 1958 that found large ozone loss in the Antarctic, but these measurement have been found to be false, due to instrument error.

In a simple model calculation, the observed halogen concentrations induced just about the extra 50 % ozone loss in the region.

So ozone loss in the troposphere is a good thing, really.

Ozone loss in the stratosphere and the consequent increase in penetration of UV into the upper troposphere tends to reduce the differential between the atmospheric pressure in the stationary high pressure cell East of Chile and the low over Indonesia tending to move the atmosphere towards a constant El Nino orientation.

Record - breaking ozone loss in the Arctic winter 2010/2011: comparison with 1996/1997 — Kuttippurath et al. (2012) http://www.atmos-chem-phys.net/12/7073/2012/acp-12-7073-2012.pdf

The combination of these two cooling effects causes dramatically increased ozone depletion so that ozone loss in the Arctic by the year 2020 is roughly double what it would be without greenhouse gas increases.

It's no surprise the science article titled, «Unprecedented Arctic ozone loss in 2011» appeared in Nature, on October 2, 2011.

Cold conditions and ozone loss in the lowermost Arctic stratosphere (e.g., between potential temperatures of 360 to 400 K) were particularly unusual compared to previous years.

The recipe for massive springtime ozone loss in the polar regions, such as the annual ozone hole seen over Antarctica during the past two decades, is fairly simple.

But total ozone maps are not able to support any statement about chemical ozone loss in the Arctic.

«Until we did our recent work no - one realized that the Calbuco eruption in Chile, actually had significantly affected the ozone loss in October of last year,» Solomon said.

So far the degree of Arctic ozone loss in winter 2004/2005 is very similar to the previous record loss in the Arctic, that occurred during winter 1999/2000.

In 2016, their analyses suggest, about 3 % of the summer ozone loss in the Antarctic could be traced to CH2Cl2.

Increasing greenhouse gases may therefore be at least partly responsible for the very large Arctic ozone losses in recent winters, and the situation may worsen in the future.

«Accordingly, it is impossible to predict the potential severity of ozone losses in a future climate.»

Not exact matches

He doesn't believe in natural loss of fossil fuels, ozone... yet he is worried about limited cash flow.

In 1984, the US National Research Council reported that rates of ozone loss were less than anticipated — fractions of 1 per cent.

Colder temperatures and weaker high - altitude winds may make the arctic polar vortex even more intense in future winters and trigger greater ozone loss, says atmospheric scientist Paul Newman of NASA's Goddard Space Flight Center in Greenbelt, Maryland, although the losses probably won't approach those in Antarctica.

It is possible to do a small - scale test, with quite low risks, that measures key aspects of the risk of geoengineering — in this case the risk of ozone loss.»

That falls short of Antarctica's total loss at some altitudes, but it's one of the worst ozone wipeouts ever seen in the Arctic.

Atmospheric scientists are analyzing data from weather balloons and satellites for clues to how the ozone will fare when sunlight — a third factor in ozone loss — returns to the Arctic.

At present, naturally - emitted VSLS account for around 90 % of the total ozone loss caused by VSLS in the lower stratosphere.

That is why, over Antarctica, ozone loss doesn't get going in earnest until September, the beginning of the southern spring, when light returns to the pole.

They identified 10 environmental limits we might not want to transgress in the Anthropocene: aerosol pollution; biodiversity loss; chemical pollution; climate change; freshwater use; changes in land use (forests to fields, for example); nitrogen and phosphorus cycles; ocean acidity; and the ozone hole.

Earth System Threshold Measure Boundary Current Level Preindustrial Climate Change CO2 Concentration 350 ppm 387 ppm 280 ppm Biodiversity Loss Extinction Rate 10 pm > 100 pm * 0.1 - one pm Nitrogen Cycle N2 Tonnage 35 mmt ** 121 mmt 0 Phosphorous Cycle Level in Ocean 11 mmt 8.5 - 9.5 mmt — 1 mmt Ozone Layer O3 Concentration 276 DU # 283 DU 290 DU Ocean Acidification Aragonite ^ ^ Levels 2.75 2.90 3.44 Freshwater Usage Consumption 4,000 km3 ^ 2,600 km3 415 km3 Land Use Change Cropland Conversion 15 km3 11.7 km3 Low Aerosols Soot Concentration TBD TBD TBD Chemical Pollution TBD TBD TBD TBD * pm = per million ** mmt = millions of metric tons #DU = dobson unit ^ km3 = cubic kilometers ^ ^ Aragonite is a form of calcium carbonate.

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

Through extensive modeling of stratospheric chemistry, the team found that calcite, a constituent of limestone, could counter ozone loss by neutralizing emissions - borne acids in the atmosphere, while also reflecting light and cooling the planet.

They point out that the 50 per cent loss of ozone at low altitudes in the stratosphere is equivalent to a 15 per cent loss of total ozone (Nature, vol 259, p 283).

They fear that similar aerosol already in the northern stratosphere, which came from the eruption of Mount Pinatubo in the Philippines in June 1991, may cause a dramatic loss of ozone in the northern hemisphere next February or March.

Ozone treatment caused no changes in the PLGA and no loss of function, with cells still able to grow on the polymer scaffold, as they would in treatments.

Data from observations in Japan itself show that the greatest loss of ozone — 4.5 per cent over the past 10 years — occurred over the city of Sapporo, which lies on the same latitude as Marseilles.

The figure for the column between 12 and 20 kilometres altitude was a record low of 18 Dobson units, representing a loss of 83 per cent of the ozone in that layer.

They also report that there was a 50 per cent loss of the ozone above southern Argentina and southern Chile for a few days in early October.

Rumen Bojkov, of the UN's World Meteorological Organization, says this might explain the large losses of ozone observed at lower altitudes in the stratosphere.

Balloon flights from McMurdo Station, which lies at 78 degrees South, revealed severe ozone depletion in October 1991 at altitudes between 12 and 20 kilometres, with a 93 per cent loss of ozone between 17 and 18 kilometres (Geophysical Research Letters, vol 19, p 1105).

This ozone will help to compensate for any losses in stratospheric ozone, but at the cost of causing global warming.

In addition, the larger than expected loss of UV light meant less stratospheric ozone up to 45 kilometers above the surface, but more above that line.

Clearly Antarctica is supposed to warm in the future as greenhouse levels increase (and ozone loss decreases), but it is unclear just how it should be behaving to date.

The study, led by Simone Tilmes of the National Center for Atmospheric Research (NCAR) in Boulder, Colo., warns that such an approach would delay the recovery of the Antarctic ozone hole by decades and cause significant ozone loss over the Arctic.»

result in large ozone losses.

The increasing depleation of ozone over the Pole regions, Real Climate (6 May 2005) Record Artic Ozone Loss, has at least coincided with decreased temperatures, comment 5, and increased snow falls in the Antartic continents interior, New Scientist (28 May 2005) in Brief, pozone over the Pole regions, Real Climate (6 May 2005) Record Artic Ozone Loss, has at least coincided with decreased temperatures, comment 5, and increased snow falls in the Antartic continents interior, New Scientist (28 May 2005) in Brief, pOzone Loss, has at least coincided with decreased temperatures, comment 5, and increased snow falls in the Antartic continents interior, New Scientist (28 May 2005) in Brief, p. 17.

Although the vortex broke down around mid-March of that winter, ozone loss continued in a stable remnant and by early April about 70 % of the ozone at 20 km was destroyed in this fragment of the vortex.

I would be very hesitant in attributing mass extinctions to ozone losses.

No specific mention of the «volume cold enough for ozone loss» trend line is made in the Nature text, although it is stated that «Certain clouds in the stratosphere provide surfaces on which CFC decay products are converted into forms that destroy ozone â??

The study about the research was published in the Proceedings of the National Academy of Sciences under the title «Stratospheric solar geoengineering without ozone loss.»

So the maximum loss occurrs in the heart of the ozone layer.

But again this does not prevent further ozone loss, because stable remnants of the polar vortex often survive the breakdown for weeks and ozone loss can continue in these remnants.

Now that we're in March, sufficient sunlight is available to cause sizeable ozone losses.