Fig. 5: Simulated westerly jet position and intensity under Middle Miocene boundary conditions with various orbital configurations favorable for Antarctic ice sheet expansion and retreat at different atmospheric CO2 concentrations.
From: Moisture variability in northeast Tibet following the middle Miocene Climate transition
A 280 ppm and an orbital configuration that favors a warmer climate globally without an Antarctic ice sheet. B 850 ppm and an orbital configuration that favors a warmer climate globally without an Antarctic ice sheet. C 280 ppm and an orbital configuration that favors a cooler climate globally with an Antarctic ice sheet. D 850 ppm and an orbital configuration that favors a cooler climate globally with an Antarctic ice sheet. The purple regions in these latitudinal cross-sections through the atmosphere at the ~200 mb pressure levels show the position of the westerlies. The latitudinal positions of the Aktau Section and the Guide Section are shown as white circles.
