A New Connection Between Greenhouse Warming and Stratospheric Ozone Depletion

• Main Author: Ross Salawitch The
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Arctic; The Antarctic; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.19.1503; http://techreports.jpl.nasa.gov/1998/98-0509.pdf

tions on the surfaces of polar stratospheric clouds (PSCs) that form when temperature drops below a critical threshold. Sunlight is required for catalytic removal of 03 , but sunlight also leads to the suppression of elevated concentrations of C10. Maintenance of high concentrations of CIO until equinox requires either temperatures persistently low enough to suppress concentrations of gas phase HNO3, which photolyzes and eventually converts C10 to C1NO3, or temperatures intermit- tently low enough to allow repeated exposure of air to heterogeneous processing on PSCs. More stable vortex circulations (i.e., greater isolation) typically lead to colder temperatures and a stronger association between local chemical loss and the column abundance of 03 . Ozone concentrations in the Arctic polar vortex reached unusually low values during the early springs of 1996 and 1997 (ref. 5, 6, 7). Compared to the Antarctic vortex, which experi- ences elevated concentrations of C10 until equinox and mas