“Our research reveals an important negative feedback for ozone – a sort of self-destruct mechanism.”
Media release below.
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New study reveals gas that triggers ozone destruction
Scientists at the Universities of York and Leeds have made a significant discovery about the cause of the destruction of ozone over oceans.
They have established that the majority of ozone-depleting iodine oxide observed over the remote ocean comes from a previously unknown marine source. The research team found that the principal source of iodine oxide can be explained by emissions of hypoiodous acid (HOI) – a gas not yet considered as being released from the ocean – along with a contribution from molecular iodine (I2).
Since the 1970s when methyl iodide (CH3I) was discovered as ubiquitous in the ocean, the presence of iodine in the atmosphere has been understood to arise mainly from emissions of organic compounds from phytoplankton — microscopic marine plants.
This new research, which is published in Nature Geoscience, builds on an earlier study which showed that reactive iodine, along with bromine, in the atmosphere is responsible for the destruction of vast amounts of ozone – around 50 per cent more than predicted by the world’s most advanced climate models – in the lower atmosphere over the tropical Atlantic Ocean.
The scientists quantified gaseous emissions of inorganic iodine following the reaction of iodide with ozone in a series of laboratory experiments. They showed that the reaction of iodide with ozone leads to the formation of both molecular iodine and hypoiodous acid. Using laboratory models, they show that the reaction of ozone with iodide on the sea surface could account for around 75 per cent of observed iodine oxide levels over the tropical Atlantic Ocean.
Professor Lucy Carpenter, of the Department of Chemistry at York, said: “Our laboratory and modelling studies show that these gases are produced from the reaction of atmospheric ozone with iodide on the sea surface interfacial layer, at a rate which is highly significant for the chemistry of the marine atmosphere.
“Our research reveals an important negative feedback for ozone – a sort of self-destruct mechanism. The more ozone there is, the more gaseous halogens are created which destroy it. The research also has implications for the way that radionucleides of iodine in seawater, released into the ocean mainly from nuclear reprocessing facilities, can be re-emitted into the atmosphere.”
Professor John Plane, from the University of Leeds’ School of Chemistry, said: “This mechanism of iodine release into the atmosphere appears to be particularly important over tropical oceans, where measurements show that there is more iodide in seawater available to react with ozone. The rate of the process also appears to be faster in warmer water. The negative feedback for ozone should therefore be particularly important for removing ozone in the outflows of pollution from major cities in the coastal tropics.”
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The science of ozone production and depletion is both complex and intriguing. If it is true that “the more ozone there is, the more gaseous halogens are created which destroy it,” then clearly there must be much more ozone production in the lower atmosphere at tropical and mid latitudes than was previously understood. I’d be curious to see future research regarding those sources; my guess is they are likely to be naturally occuring (i.e., not Man-made).
Maybe this avenue of research will lead to a better understanding of how to scrub the smog from places like Vancouver and L.A., where the local geography and environment virtually guarantee high ozone concentrations at certain times of the year, regardless of human emissions levels. Heck, as long as we’re dreaming, maybe future research will show that these same naturally occuring compounds are what’s driving ozone depletion (when it occurs) at ALL levels of the atmosphere, and we can go back to using chemicals in our refrigerators and air conditioners that actually work .
Bwaaaaahahahaha, who am I kidding….
I see two possible solutions to the “problem” –
Eliminate humans, and there will be no more human activity.
Eliminate activist “scientists” who go out of their way to invent non-existent “problems” backed up by meaningless “data” that accounts for nothing except their own “hypotheses” about how impossible “interactions” occur only with something that humans had anything to do with them.