Extended Data Fig. 3: Effect of gravitational fractionation on isotopic ratios in the LOCK-IN firn.
From: Isotopic constraint on the twentieth-century increase in tropospheric ozone
Shown are δ15N values of N2 measured at LSCE (black stars); δ18O values of O2, divided by 2, measured at LSCE (green crosses) and at Rice University (red circles); and δ18O18O values of O2, divided by 4, measured at Rice University (blue circles). The black line shows the barometric slope.
