Exploring noctilucent cloud variability using the nudged and extended version of the Canadian Middle Atmosphere Model

摘要: Abstract Ice particles in the summer mesosphere – such as those connected to noctilucent clouds and polar mesospheric echoes - have since their discovery contributed uncovering of atmospheric processes on various scales ranging from interactions molecular levels global scale circulation patterns. While there are numerous model studies ice microphysics how relate background atmosphere, at this point few using comprehensive climate models investigate observed variability climatology clouds. In study it is explored what extent large-scale inter-annual characteristics captured a 30-year run extending 1979 2009 nudged extended version Canadian Middle Atmosphere Model (CMAM30). To construct zonal mean inter-seasonal cloud occurrence frequency mass density both hemispheres, simple applied which assumed that content solely controlled by local temperature water vapor volume mixing ratio. The results compared satellite observations, each having an instrument-specific sensitivity when comes detecting It found able capture onset dates NLC seasons hemispheres well hemispheric differences NLCs, weaker NLCs SH than NH height. We conclude model.