Researchers from the Universities of Leeds and York (UK) found that most of the observed over the ocean, iodine oxide (ozone-depleting substances) comes from a source that previously overlooked.
Scientists came to the conclusion that the latter may be emissions iodnovatistoy acid (HOI) – gas, which, as previously thought, the ocean does not stand out – along with molecular iodine (I2).
|Beach near Fort Lauderdale in South Florida (photo Gordon Ott).|
Since the 1970's, when it became clear that the ocean is present everywhere methyl iodide (CH3I), it was believed that iodine emitted into the atmosphere mainly from the production of organic compounds by phytoplankton – microscopic marine plants.
The new study is based on an earlier, which showed that iodine (along with bromine) is responsible for the destruction of the lower atmosphere over the tropical Atlantic Ocean huge amounts of ozone – around 50% more than projected in the most advanced climate models.
Scientists have calculated the emissions of gaseous inorganic iodine on the results of laboratory experiments. It was found that the reaction of iodine with ozone leads to the formation not only of molecular iodine, but iodnovatistoy acid. This reaction occurring on the sea surface, may account for about 75% of the observed level of iodine oxide over the Atlantic tropics.
Why the tropics? It dissolves in water more iodine, and the relatively high temperature promotes the reaction.
Study co-author John Plain of the University of Leeds, said that the findings underscore the importance of ozone removal from waste water of major cities in the coastal tropics.
According to Lucy Carpenter of York University, is a kind of self-destruct mechanism of ozone: what it is, the more active are destroying its gaseous halogens.
The study is published in the journal Nature Geoscience.
Prepared according to the University of Leeds.