Clear air turbulence(CAT),a meso-or microscale(subgrid scale)phenomenon occurring in synoptic scale flow field at high altitude,is very difficult to be observed by the conventional obser- vation network.Thus it is nec...Clear air turbulence(CAT),a meso-or microscale(subgrid scale)phenomenon occurring in synoptic scale flow field at high altitude,is very difficult to be observed by the conventional obser- vation network.Thus it is necessary to approach an index to predict CAT.But at first,the struc- ture characteristics of CAT should be preanalyzed.In this paper,based on the theoretical and diag- nostic analysis of a case,features for wind profile,energy budget and dynamic mechanism of this case were presented.Furthermore,an objective and quantitative index for CAT forecast was giv- en.The verification for its efficiency was done with both real-time observation data and products from a numerical model.The results are very encouraging.展开更多
文摘Clear air turbulence(CAT),a meso-or microscale(subgrid scale)phenomenon occurring in synoptic scale flow field at high altitude,is very difficult to be observed by the conventional obser- vation network.Thus it is necessary to approach an index to predict CAT.But at first,the struc- ture characteristics of CAT should be preanalyzed.In this paper,based on the theoretical and diag- nostic analysis of a case,features for wind profile,energy budget and dynamic mechanism of this case were presented.Furthermore,an objective and quantitative index for CAT forecast was giv- en.The verification for its efficiency was done with both real-time observation data and products from a numerical model.The results are very encouraging.
