= Sydney Chapman (mathematician)
{c}
{tag=Physicist}
{wiki}
= Sydney Chapman
{c}
{synonym}
<Sydney Chapman> developed a quantitative explanation of atmospheric <ozone> <photochemistry>. In the basic mechanism, <ultraviolet radiation> dissociates molecular <oxygen>, an oxygen atom combines with another <molecular oxygen> and a third collision partner to form <ozone>, and further reactions remove it. His 1930 treatment connected the production and destruction <reaction rates> with the distribution and seasonal variation of <ozone>, while explicitly setting aside uncertain atmospheric transport. It was a testable physical model with stated omissions, rather than a complete account of all observed <ozone> changes.<A Theory of Upper-Atmospheric Ozone by Sydney Chapman>[Introduction and sections on formation and removal of atmospheric ozone; original-paper excerpt]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Sydney_Chapman.jpg?width=260]
{title=Portrait of <Sydney Chapman (mathematician)>}
{description=NOAA. Public domain in the United States (NOAA official work). https://commons.wikimedia.org/wiki/File:Sydney_Chapman.jpg[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Sydney_Chapman.jpg}
{width=260}
Back to article page
