The Ozone Layer Above Cities Is Deteriorating, Warn Scientists

Ozone layer depletion EPH Zurich hydrocarbons stratosphere ozone columns CFC bans Montreal Protocol satellite measurements ozone-depleting compounds atmospheric circulation

Ozone layer depletion EPH Zurich hydrocarbons stratosphere ozone columns CFC bans Montreal Protocol satellite measurements ozone-depleting compounds atmospheric circulation

The study was published on Tuesday in the journal Atmospheric Chemistry and Physics.external link It found that the ozone layer is continuing to decline on a global scale despite decades of worldwide efforts to protect it. Scientists demonstrated this using satellite measurements spanning the past 30 years combined with advanced statistical methods.

The ozone layer hole over Antarctica has been closing since the chemicals causing the problem were banned by the Montreal protocol, The Guardian noted.

Researchers conducted an analysis on 11 different locations and gathered information which helped them create a subtle model of the ozone throughout the last 30 years.

While ozone layer in the polar region is recovering from past thinning, scientists detected a drop in the amount of ozone in recent years at lower levels of the stratosphere in nonpolar regions, according to a study led by 22 scientists at research centers in the United States and Europe, per the Journal. In one side, the banning of CFCs is helping to recovery at the poles but the same law is not appearing very helpful for the lower latitude.

The cause of the decline is unknown but might be the result of global warming.

CFCs and the other gases were banned under an worldwide agreement, the Montreal Protocol, and since then parts of the layer have been recovering, particularly at the poles.

But boffins discovered ozone, a substance that absorbs UV radiation from the sun, is not healing at lower latitudes between 60N and 60S. The effect was worst in the Antarctic, where an ozone "hole" formed.

Prof Joanna Haigh at Imperial College London and a member of the global research team stated, "The study is in lower to mid-latitudes, where the sunshine is more intense, so that is not a good signal for skin cancer". "The decreases in ozone are less than we saw at the poles before the Montreal Protocol was enacted, but UV radiation is more intense in these regions".

Ozone layer depletion EPH Zurich hydrocarbons stratosphere ozone columns CFC bans Montreal Protocol satellite measurements ozone-depleting compounds atmospheric circulation
Ozone layer continues to DECLINE in areas of the world, scientists find – and believe it's down to climate change

Scientists are not yet sure what accounts for this continuing decline but one explanation could be that climate change modifies the pattern of atmospheric circulation.

The other is that very short-lived substances (VSLSs), which contain chlorine and bromine, could be destroying ozone in the lower stratosphere.

Ball and others emphasize that the Montreal Protocol has still been a success. "These short-lived substances could be an insufficiently considered factor in the models", says Ball.

Scientists had thought that VSLSs would not persist long enough in the atmosphere to reach the stratosphere and affect ozone.

Today's publication combines the datasets of multiple worldwide teams, connecting information from various satellite missions since 1985.

The researchers say the focus now should be on getting more precise data on the ozone decline, and determining what the cause most likely is, for example by looking for the presence of VSLSs in the stratosphere.

An atmospheric chemist at the British Antarctic Survey, Anna Jones who is not a part of the study informed that before taking further steps to prevent decrease the layer it is important that to find out the reasons that are causing the observed downward trend. The study was conducted by 22 scientists at research centres in the USA and Europe.

West Ham sack recruitment chief Henry
How many Italians come and settle in England?" Still, at least we are the 17th richest club in world football . The post was liked by teammates Manuel Lanzini, Adrian, Pedro Obiang and Arthur Masuaku.

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