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… when, after the long Arctic winters, sunlight returns. Ozone is depleted at the same time, and it is believed that … are the cause of the photo-chemical reactions that deplete ozone and mercury. During these events, gaseous oxidized … Changes in oxidant levels in the atmosphere, such as ozone and bromine, may also influence the rate of oxidation …

… Arctic and Antarctic responses to greenhouse gas and ozone forcing. Philosophical Transactions of the Royal … 437: 681-686. Perlwitz J, Hoerling M, Dole R. 2015. Arctic tropospheric warming: Causes and linkages to lower latitudes. … and this raises the tropopause and increases upper tropospheric temperatures near the equator (about 15 km up) …