Sentences with phrase «h.riesenfeld on ozone»

In the case of the attack on the ozone layer by chlorofluorocarbons, the impact could be made negligible by operating on the T factor alone, that is, ban the offending chemical.

In three separate indoor UV chambers, Benca exposed the dwarf pines to 7.5, 10 and 13 times Berkeley's normal UV - B intensity, in line with estimates of the impact Siberian Trap eruptions would have had on the ozone layer if their emissions occurred over various lengths of time, ranging from 400,000 years to less than 200,000 years.

That's because nitrogen and chlorine compounds counteract each other's effects on ozone: the more chlorine there is, the less destructive nitrogen is, and vice versa.

In the study, the researchers used a 3D computer model of the atmosphere to determine the impact of VSLS on ozone and climate.

«International action on the ozone layer is a major environmental success story,» said WMO Secretary - General Michel Jarraud.

Since the early 1970s atmospheric scientists have known that CFCs could have destructive effects on ozone.

Schoenbein's work on ozone was considered a classic at the time.

In addition, he says, since CFCs are not particularly soluble in water, they would not be present in cloud - born ice particles in very high concentrations, so the mechanism Lu and Sanche propose would not dissociate enough CFCs to have a big impact on ozone levels.

In Copenhagen, scientists advised the ministers that banning methyl bromide as a fumigant could have as much effect on the ozone layer as banning CFCs and carbon tetrachloride 3 years earlier than scheduled.

This prize was given for work on the ozone hole.

To examine the impacts of climate change on ozone pollution, Pfister and her colleagues looked at two scenarios.

«EPA acknowledges the newer studies on ozone «do not materially change any of the broad scientific conclusions regarding the health effects of exposure,»» the group said in a statement.

Short - lived bromine compounds naturally released from the ocean surface, however, have a more pronounced impact on ozone than their short - lived industrial cousins.

«Because of its very short - lived nature, and the unlikely scenario of the emissions sustaining a high growth rate, it's highly unlikely dichloromethane would have a major impact on the ozone layer,» said Liang.

All of the long - lasting and some of the anthropogenic short - lived compounds are controlled by the Montreal Protocol in order to reduce their impact on ozone.

Certain particles may have a damaging effect on the ozone layer, vital for keeping harmful UV rays away from the surface of the Earth.

«The researchers also calculated the likely effect of remediation on the ozone layer, but found that ozone depletion would be short - lived and similar to that resulting from natural processes such as large solar storms and volcanic eruptions.»

These can have a limited effect on ozone levels (by serving as hetrogeneous reaction sites) and can reflect enough of the sun's light back into space to cause a notable global cooling.

The East Asian monsoon exerts a controlling influence on ozone in Southern China.

The air quality issues in the EPA are almost all focused on ozone.

Now that we're on ozone depletion, I read a few years ago that NOx over mid-latitudes in N. America, due to agriculture (chem fertilizers) & car - driving, was causing a thinning of the ozone layer.

The halogens that are released generally end up in fairly unreactive forms where they have only a small effect on ozone.

«International action on the ozone layer is a major environmental success story,» WMO Secretary - General Michel Jarraud said in a UNEP statement.

But the warming does not have an immediate effect on ozone loss and our observations show that ozone loss still continues these days.

Alexander Mangold from the Royal Meteorological Institute of Belgium explains the resarch he does at the Princess Elisabeth Antarctica station, which focuses on ozone and aerosols in the atmosphere.

Carbon dioxide has no direct effect on ozone, unlike CFCs and HFCs.

The presence of ozone helps to explain the detection of hydroxyl (an unstable molecule of oxygen with a single atom of hydrogen) high in planet's atmosphere in 2008 (ESA news releases on ozone, sulfur dioxide, and hydroxyl; Lisa Grossman, New Scientist, October 6, 2011; and Montmessin et al, 2011).

We all know the 1989 ban on ozone - depleting chemicals was a success.

Higher levels of carbon dioxide, however, do have an indirect effect on the ozone layer in the stratosphere.

HFCs may not have the same impact on the ozone layer, but they are potent contributors to climate change.

Amplification of the direct solar forcing is conceivable, e.g., through effects on ozone or atmospheric condensation nuclei, but empirical data place a factor of two upper limit on the amplification, with the most likely forcing in the range 100 — 120 % of the directly measured solar irradiance change [64].

Has served as Review Editor of Chapter 5, IPCC Aviation Report and the European Assessments on ozone and UV as well as in the recent IPCC report on natural disasters and the EU report on Ozone - Climate Interactions.

«We tell our patients to watch for days of high heat and humidity, and to be especially mindful on ozone action days,» says Dr. Baptist.

... I would suggest posting it on the ozone generator page and the community message board (see the nav menu above).

EcoLogo requires products to meet Energy Star criteria and Restriction of Hazardous Substances (RoHS) requirements and sets strict limits on ozone, dust, and VOC emissions.

Joining Crichton on climate change issues was William Gray of hurricane forecasting fame, Richard Benedick (a negotiator on the Montreal Protocol on ozone - depleting chemicals), and David Sandalow (Brookings Institution).

I further consulted an old lecture from 1946 by Ernst H.Riesenfeld on ozone.

However when the sun returns one can have a sitution where alot of active Cl componds have built up and wammo they then do to town on the ozone.

At least Chubachi's data were cited by Solomon et al., 1986, but his contribution sadly is not much acknowledged in the literature on the ozone hole history.

Note as well that the strength of the vortex itself depends on the temperatures, which in turn depend on the ozone levels.

A number of lawmakers, foreign governments and environmental advocates had urged the administration to offer an amendment to the Montreal Protocol, the international treaty on ozone - depleting substances, calling for the rapid elimination of HFC's.

But the warming does not have an immediate effect on ozone loss and our observations show that ozone loss still continues these days.

I wish to make it clear that I do think action on ozone / soot is needed.

«The researchers also calculated the likely effect of remediation on the ozone layer, but found that ozone depletion would be short - lived and similar to that resulting from natural processes such as large solar storms and volcanic eruptions.»

You really will wind up extinct from enabling people who lie into your faces about things like the effect of halogenated refrigerants on the ozone layer, fully confirmed by laboratory experiments as well as field observation.

The loudest objections and most frequent emails come from the folks who also tend to believe: * The USA did not land on the moon * There was a government conspiracy in the JFK assassination * Fluoride in our water supply is a method of government control * The world is only ~ 5,000 years old * CFC's have no impact on the ozone hole.

Erik said one of the people attacking me had done the same to Sherwood Rowland, ** a co-recipient of the Nobel Prize for his work on ozone depletion.

Regarding the so - called «Singer attack of Sherwood Rowland», I addressed that with verbatim text in my January 16, 2015 blog post, in which I dissected Oreskes» assertion that Erik Conway «said one of the people attacking me had done the same to Sherwood Rowland, a co-recipient of the Nobel Prize for his work on ozone depletion.»

With such facts, it's worth to note that the proclaimed impending Maunder Minimum, although having little effect on AGW, will have a positive effect on the ozone hole: if the lower level sun activity is confined to essencialy UV spectrum, then ozone will be depleting at lower rate, giving it a chance to recover quicker.

«They can throw out water vapor and ice, which sets the humidity of the stratosphere, and that has an impact both because water vapor is greenhouse gas and also because water vapor, through a sequence of events, has an effect on the ozone hole,» Romps said.