Large upper tropospheric ozone enhancements above mid-latitude North America during summer: in situ evidence from the IONS and MOZAIC ozone monitoring network.

Bertram, T.; Brune, W.; Cohen, R.; Cooper, O.; Crawford, J.; Fehsenfeld, F.; Forbes, G.; Johnson, B.; Meagher, J.; Merrill, J.; Moody, J.; Morris, G.; Nedelec, P.; Newchurch, M.; Oltmans, S.; Pickering, K.; Schmidlin, F.; Stohl, A.; Tarasick, D.; Thompson, A.; Trainer, M.; Turquety, S.; Witte, J.; Woolridge, P.