Fig. 6: | Nature Communications

Fig. 6

From: A hexagon in Saturn’s northern stratosphere surrounding the emerging summertime polar vortex

Fig. 6

Vertical distributions of temperature, acetylene and ethane derived from 0.5-cm−1 spectral resolution data of both poles. The panels show COMPSITs targeting the north pole in March 2017 (ac, 84–87°N) and the south pole in July 2008 (df, 83–88°S). A grid of 2000 a priori atmospheres (varying the temperature and hydrocarbon distributions) was employed as starting point. Red lines indicate profiles fitting the spectrum within 1σ of the best fit, blue lines are for 2σ, turquoise lines are for 3σ and grey lines are for optimal estimates that do not fit within the 3σ envelope. We have confidence in retrieved profiles in altitude ranges where the profiles converge, irrespective of the a priori starting points. The hydrocarbon profiles are compared to the output of a diffusive photochemistry model19 at ± 72° latitude for Ls = 88° (dashed black line) and Ls = 346° (solid black line). The temperature profiles are compared to the predictions or a radiative climate model13 in the absence of stratospheric aerosols for ± 85° latitude and for Ls = 88° (dashed black line) and Ls = 346° (solid black line)