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Noctilucent clouds and the mesospheric water vapour: the past decade

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Academic year: 2021

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Figure

Fig. 1. Sensitivity of the zonally averaged NLC volume backscat- backscat-ter coefficient β (532 nm) on altitude and background water vapour abundance at 80 km as calculated by the COMMA/IAP model for summer solstices conditions at 69 ◦ N latitude.
Fig. 2. The ratio R=f(H 2 O) max Ly /f(H 2 O) min Ly of the water vapour mixing ratio f at maximum over minimum solar Lyman α flux conditions as function of altitude z, calculated by the COMMA/IAP model for summer solstices conditions at 69 ◦ N  lat-itude
Figure 4 shows the particle size distributions for the entire hemispheric ice cloud and for different water vapour  con-centrations calculated from the 3-D COMMA/IAP model  in-cluding the latitudinal weighting
Table 2. Longer term observations of upper mesosphere H 2 O (in approximate historical order).
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