(a) Evolution of the correlation of ozone with H2O from May 1 through September 1 from 2-D model simulations at 75°N compared to the exterior fit. The exterior fit is made to ER-2 data acquired at northern mid-latitudes outside the polar vortex.
(b) Same as (a) except from January 1 to April 1. All ER-2 data taken inside the Arctic polar vortex during the Airborne Arctic Stratospheric Expedition (AASE) are also included (open circles). [Adopted from Proffitt et al., 1992]
![[]](../../image/igloo.gif)
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