To text describing this figure   To MLS home page    To MLS scientific results page

Zurek/Manney UARS Theoretical Investigation

Minimum temperature, ClO and ozone in northern hemisphere winters


time series of temperature, ClO, and O3 from 1991-1995 in NH winters

top: Minimum Arctic polar vortex temperatures on the 465K isentropic surface (~50 hPa), from UKMO analyses. Minimum temperature was obtained by searching in a region where the scaled potential vorticity is greater than 1.2x10-4 s-1, an approximate definition of the edge of the polar vortex.

second down: Vortex-averaged (an area-weighted average in the region with scaled potential vorticity greater than 1.2x10-4 s-1) chlorine monoxide (ClO) at 465K potential temperature measured by UARS MLS.

third down: Vortex-averaged ozone at 465K potential temperature measured by UARS MLS

bottom: Column ozone above 100 hPa from UARS MLS observations. Since column ozone is not expected to be strongly correlated with the lower stratospheric vortex, the average is taken with the region north of 40o latitude where column ozone is less than 260 Dobson Units (DU).

This figure adapted from Manney et al. [Geophys. Res. Lett., vol. 23, pp. 3203-3206, 1996] and Santee et al. [Geophys. Res. Lett., vol. 23, pp. 3207-3210, 1996]; see those papers for further discussion of these data and analyses.

See also:

Back to top of this figure   To MLS home page    To MLS scientific results page