The compound, carbon tetrachloride, contributes to the destruction of the earth's ozone layer, which protects us from harmful ultraviolet radiation.…
The compound, carbon tetrachloride, contributes to the destruction of the earth’s ozone layer, which protects us from harmful ultraviolet radiation.
The result is that carbon tetrachloride production has been banned worldwide since 2010 for use that will lead to emissions into the atmosphere. Recent studies have, however, shown that global emissions have not fallen as expected, with about 40,000 tonnes emitted each year.
The origins of these emissions have puzzled researchers for many years.
In addition to collaborators from South Korea, Switzerland, Australia and the United States, researchers at the University of Bristol aim to quantify emissions from eastern Asia.
To do this, ground-based and airborne atmospheric concentration data were used from the near Korean peninsula and two models simulating the transport of gases through the atmosphere.
The results, published in the journal Geophysical Research Letters, show that about half of the “missed” global carbon tetrachloride emissions originated from east China between 2009 and 201
Leader, Dr. Mark Lunt, from the University of Bristol Chemistry of Chemistry , said: “Our results show that carbon tetrachloride emissions from the eastern Asia region account for a large proportion of global emissions and are significantly larger than any previous studies have suggested.
” It was not only that, but despite carbon tetrachloride production For emissions utilization in 2010, we found no evidence of a subsequent reduction in emissions. “
In fact, emissions from certain regions may have increased slightly since 2010. The results from the survey show that a new source of emissions from Shandong Province China after 2012.
while the results of this and earlier studies in Europe and the United States now explain a large part of the global distribution of carbon tetrachloride emissions, there are still major gaps that we know. Furthermore, recent reports have suggested that very large amounts of this gas can be delivered inadvertently during the manufacture of other chemicals like chlorine.
Dr Matt Rigby, atmospheric chemist at the University of Bristol and co-author, said: “Our work shows the carbon tetrachloride release, but we are not familiar with the processes or industries that are responsible. This is important because we do not know whether it is intentionally or unintentionally produced. “
He” There are areas in the world like India, South America and other parts of Asia where emissions of ozone depleting gases can last but there are no detailed atmospheric measurements . “
It is hoped that this work can now be used by researchers and regulators to identify the cause of these emissions from eastern Asia. Ultimately, if these emissions could be avoided, it would accelerate the recovery of stratospheric ozone layer.
Dr Lunt said: “Studies like this show the importance of continued monitoring of ozone depleting gases. There is a temptation to see ozone thinning as a problem that has been solved. However, the monitoring of artificial ozone depleting gases in the atmosphere is crucial to ensuring continued success with the phasing out of these compounds.
University of Bristol
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