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Zonal mean atmospheric distribution of sulphur hexafluoride (SF6)

MIPAS is a polar orbiting high resolution mid‐infrared limb emission sounder with a nominal vertical resolution of 3 km. Building on previous work, we determine global (90°N–90°S, 5° resolution) zonal mean distributions for sulphur hexafluoride from measurements between 6 and 36 km. The time evolution of the global structure is useful for age of air determination and the validation of dynamics in atmospheric models. By comparing solstice and equinox months from 2002 through to 2004, we observe differences which shift with seasonal changes in atmospheric circulation. In addition, a clear systematic increase in the SF6 loading with time is observed globally (0.30 ± 0.025 pptv yr−1). This is compared against independent surface measurements.