Ozonehole grows this year, but still shrinking in general
"The overall trend is improvement. It's a little worse this year because it was a little colder this year," said NASA Goddard Space Flight Center Chief Earth Scientist Paul Newman, who tracksJust looking at the maximum ozone hole size, especially in October, can be misleading, said top ozone scientist Susan Solomon of MIT.
"Ozone depletion starts LATER and takes LONGER to get to the maximum hole and the holes are typically shallower" in September, which is the key month to look at ozone recovery, not October, Solomon said Thursday in an email. Chlorine and bromine chemicals high in the atmosphere eat at Earth's protective ozone layer. Cold weather creates clouds that releases the chemicals, Newman said. The more cold, the more clouds, the bigger the ozone hole.
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