Friday, September 19, 2008

Comic Rays and Ozone holes cooling the Southern Hemisphere

As w have seen here previously on GCR

NOx is produced in dissociation of molecular nitrogen by the primary and secondary solar particles and, to a lesser extent, in ion chemical reactions following the ion pair production. Production of HOx is solely due to ion chemistry,involving a rather complex scheme of water cluster ion reactions. The depletion of ozone is due to the increase of NOx and HOx, which accelerates the catalytic ozone loss cycles involving these species.The magnitude and duration of depletion depends on the particle flux, altitude,season(solar illumination level and atmospheric dynamics),and the chemical state of the atmosphere. The short-term ozone depletion due to HOx increase lasts some hours and can be greater than 90% in the middle mesosphere, while the long-term decrease, several tens of percent, is typically seen in the upper stratosphere and is due to NOx increase. Because of the long chemical lifetime of NOx, the effects on ozone can last for months and the produced NOx can be transported from the location of the precipitation, so that lower altitudes and latitudes may also be affected.

Nitrous oxide is a cooling agent for the upper atmosphere and during high energy events from either SPE or during high GCR activity we can see around 5 watts per metre removed from the radiative energy budget.

Recent commentary on this years Sizable ozone hole are now appearing.

A new Canadian study says that cosmic rays, not chlorofluorocarbons (CFCs), are the main cause of the depletion of the ozone layer in the earth's atmosphere. The study also predicts that the largest ozone hole - larger than the size of the US and Canada combined - will occur over Antarctica in ``one or two weeks.''

The ozone layer in the earth's atmosphere absorbs the sun's high-frequency ultraviolet rays which are deadly for life on earth and cause diseases such as skin cancer and cataracts.

As we will be in a persistant state of high gcr the probability of warmer summer temperatures in the SH ARE NOT SIGNIFICANTLY HIGH.


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