Sentences with phrase «ozone molecules»

A single chlorine atom can tear apart thousands of ozone molecules.

A single chlorine atom can destroy thousands of ozone molecules.

Once water vapor gets into the normally dry stratosphere, it can in theory interact with manmade chlorine compounds known as chlorofluorocarbons, or CFC's, to destroy ozone molecules.

Carbon dioxide prevents the formation of new ozone molecules in the troposphere, and higher CO2 levels in the upper atmosphere may be contributing overall to the closing of the ozone holes over the poles.

A molecule containing three oxygen atoms, computer models suggest that ozone on Venus is formed when sunlight breaks up carbon dioxide molecules and releases oxygen atoms, which are swept around to the planet's nightside by winds where they can then combine to form unstable, three - atom ozone molecules, as well as much more stable, two - atom molecules essential for animals.

Several years ago, a team led by Qing - Bin Lu of the University of Sherbrooke in Quebec, Canada, reported laboratory experiments suggesting that electrons liberated by cosmic - ray collisions could break down chlorofluorocarbon molecules, releasing chlorine atoms that tear ozone molecules apart.

(One part of ozone per billion by volume (ppbv) means there is one ozone molecule for every billion air molecules.)

The ozone layer (simply a part of the stratosphere with a relatively high concentration of uv - blocking ozone molecules) is situated at an altitude of 13 to 40 kilometres above the Earth's surface.

The Montreal Protocol on Substances That Deplete the Ozone Layer, which has resulted in the phasing out of chlorofluorocarbons (CFCs), a group of industrial compounds that react with and disassociate ozone molecules, is a collective adaptive response by humans to a perceived and predicted threat to life from stratospheric ozone depletion.

So, Chapman proposed that as soon as one of these oxygen atoms («free radicals») collided with an ordinary diatomic oxygen molecule, they would react together to form a single triatomic ozone molecule (Figure 18).

One CFC molecule destroys some 100,000 ozone molecules during its life up there.

Alarm was raised in the 1970s about the state of this protective layer when scientists such as Mario Molina and F. Sherwood Rowland discovered that chemicals, including chlorofluorocarbons (CFCs) were destroying ozone molecules (Chasek et al 164)(Mossos 1).

Left: Ozone molecules in a planet's atmosphere could indicate biological activity, but ozone, carbon dioxide and carbon monoxide — without methane, is likely a false positive.

Also, the overall number of ozone molecules destroyed in a vertical column of air was pretty much the same as the number of molecules transported into this column by the average poleward and downward transport of air in the stratosphere.

The chlorine atoms that are released then dismantle any ozone molecules they interact with.

This frees up oxygen atoms, which join up to form ozone molecules on the cooler night side (Icarus, DOI: 10.1016 / j.icarus.2011.08.010).

Previous research had shown that the loss of ozone molecules (which absorb solar energy) cools the lower stratosphere by six degrees Celsius each spring.

Indeed, their increased production as the result of human activity, along with increased emissions of other ozone - depleting substances (ODS), is tipping the balance: ozone molecules in the stratosphere are being broken up faster than they are formed.

A single chlorine atom then can catalyze the destruction of thousands of ozone molecules.

The Antarctic ozone hole forms every Southern Hemisphere spring, when chemical reactions involving chlorine and bromine break apart the oxygen atoms that make up ozone molecules.

So there was alarm in the 1970s when researchers first warned that extremely stable man - made compounds such as CFCs, used in refrigerants and aerosols, were floating up into the stratosphere, where they released chlorine and bromine atoms that break down ozone molecules.

The second step is the photodissociation of the ozone molecule formed by the three body collision which is too improbable to occur in the less dense atmosphere of the mesosphere.

For the important ultraviolet photons which are desired to be removed from the solar radiation are those less energetic photons which decompose the ozone molecules to produce another oxygen atom which again can reform another ozone molecule.

Sun Cl Once free, the chlorine atom is off to attack another ozone molecule and begin the cycle again.

Ozone - depleting substances are emitted by human activity at the planet's surface and eventually travel to the stratosphere, where there the chlorine atoms and certain other constituent parts break apart the three oxygen atoms that make up an ozone molecule.

Photo - dissociation of the ozone molecule is the major process that leads to the production of OH (hydroxyl radical), the main oxidizing (i.e., cleansing) gas species in the troposphere.

Once free, the chlorine atom is off to attack another ozone molecule and begin the cycle again.