The authors analyzed the retrieval sensitivity of tropospheric ozone using simulated the Global Ozone Monitoring Experiment-2(GOME-2) measurements.The retrieval sensitivity was evaluated by the degree of freedom for signal(DFS).The combination of the ultraviolet(UV),UV polarization(UVPOL),and visible(VIS) bands enhances DFS of tropospheric ozone and improves the vertical resolution of the retrieved ozone profile.UVPOL reduces the dependence on solar zenith angle,mainly increases the sensitivity in upper troposphere.Polarization increased the DFS by 20% on the eastern side of the GOME-2 orbit,with little improvement on the western side because the increase in DFS due to polarization is dependent on the relative azimuth angle.The inclusion of the visible band reduces significantly the dependence on viewing geometry,and mainly increases the DFS in the lower troposphere(0-6 km) by a factor of two.It was possible to retrieve several independent pieces of tropospheric ozone information from GOME-2 UV/UVPOL/VIS measurements,especially in the lower troposphere.
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