Analysis of aircraft, radiosonde, and radar observations in cirrus clouds observed during FIRE II: The interactions between environmental structure, turbulence, and cloud microphysical properties

Ways to determine the turbulence intensity and the horizontal variability i n cirrus clouds have been investigated using First International Satellite Cloud Climatology Project (ISCCP) Regional Experiment II aircraft, radioson de, and radar data. Higher turbulence intensities were found within some, b ut not all, of the neutrally stratified layers. It was also demonstrated th at the stability of cirrus layers with high extinction values decreases in time, possibly as a result of radiative destabilization. However, these fea tures could not be directly related to each other in any simple manner. A s imple linear relationship was observed between the amount of horizontal var iability in the ice water content and its average value. This was also true for the extinction and ice crystal number concentrations. A relationship w as also suggested between the variability in cloud depth and the environmen tal stability across the depth of the cloud layer, which requires further i nvestigation.