Fig. 3: Variations in the cold point tropopause and in the strength of Brewer–Dobson circulation associated with the H2O variability.
From: Multi-decadal variability controls short-term stratospheric water vapor trends
a Time series of deseasonalized anomalies in the cold point tropopause (∆CPT) averaged over 20°S–20°N smoothed by a 5-month running mean (solid thin line) and the range and mean of MDVs over the region (gray shade and thick dotted line). b Covariations in monthly ∆H2O[entry] averaged over 20°S–20°N at 390 K and ∆CPT (scatters). Colored diamonds show mean values for the three (wet and dry) periods. c Mean values and standard deviations over all seasons for each of the three periods are shown as diamonds and the error bars. Mean values for DJF alone are shown as triangles. Panels d–g are similar to panels a, b but for the deseasonalized age of air (∆AoA) in the NH extra-tropics and SH extra-tropics between 500 and 600 K in relation to 2CH4∆α.
