Spatial And Temporal Variability Of Mixed-Layer Depth And Entrainment Zone Thickness

摘要: Mixed-layer depth and entrainment zone thickness areextracted from two large lidar data sets with arecently developed technique. The fluxratio (which is often used to model inatmospheric boundary-layer models) can be calculatedfrom these quantities. This ratio generallybelieved in the range of 0.1 0.4. Aqualitative analysis time series (MERMOZ II dataset) confirms this values under equilibriumconditions (afternoon hours), but also shows that itclearly underestimates importance entrainmentduring morning hours when mixed layer isgrowing most rapidly. An examination spatialdistribution flux (Pacific'93 set) parameter spatiallyhighly variable, even during ‘equilibrium’ inthe afternoon. In regions where boundary layerhas adjust new conditions at theground, much larger than 0.4 observed. Although results only interpretedqualitatively, they suggest currently usedentrainment parameterisations modelsare not sufficient capture processproperly.