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• W1965495514 abstract "Model results of mesospheric ice layers and background conditions at 69°N from 1961 to 2008 are analyzed. The model nudges to European Centre for Medium‐Range Weather Forecasts data below ∼45 km. Greenhouse gas concentrations in the mesosphere are kept constant. At polar mesospheric cloud (PMC) altitudes (83 km) temperatures decrease until the mid 1990s by ‐0.08 K/yr resulting in trends of PMC brightness, occurrence rates, and, to a lesser extent, in PMC altitudes (−0.0166 km/yr). Ice layer trends are consistent with observations by ground‐based and satellite instruments. Water vapor increases at PMC heights and decreases above due to increased freeze‐drying caused by the temperature trend. Temperature trends in the mesosphere mainly come from shrinking of the stratosphere and from dynamical effects. A solar cycle modulation of H 2 O is observed in the model consistent with satellite observations. The effect on ice layers is reduced because of redistribution of H 2 O by freeze‐drying. The accidental coincidence of low temperatures and solar cycle minimum in the mid 1990s leads to an overestimation of solar effects on ice layers. A strong correlation between temperatures and PMC altitudes is observed. Applied to historical measurements this gives negligible temperature trends at PMC altitudes (∼0.01–0.02 K/yr). Strong correlations between PMC parameters and background conditions deduced from the model confirm the standard scenario of PMC formation. The PMC sensitivity on temperatures, water vapor, and Ly‐ α is investigated. PMC heights show little variation with background parameters whereas brightness and occurrence rates show large variations. None of the background parameters can be ignored regarding its influence on ice layers." @default.
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• W1965495514 date "2009-01-16" @default.
• W1965495514 modified "2023-10-08" @default.
• W1965495514 title "Stratospheric and solar cycle effects on long‐term variability of mesospheric ice clouds" @default.
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• W1965495514 doi "https://doi.org/10.1029/2009jd012377" @default.
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