详情

原文传递 DC-8 scanning lidar characterization of aircraft contrails and cirrus clouds

题名：	DC-8 scanning lidar characterization of aircraft contrails and cirrus clouds
作者：	Nielsen, Norman B.
关键词：	lidar；cirrus；trail；rails；scan；cloud；craft；distribution；measurement；instruments
摘要：	A Subsonic Assessment (SASS) element of the overall Atmospheric Effects of Aviation Project (AEAP) was initiated by NASA to assess the atmospheric impact of subsonic aircraft. SRI was awarded a project to develop and test a scanning backscatter lidar for installation on the NASA DC-8 (year 1), participate in the Subsonic Aircraft Contrail and Cloud Effects Special Study (SUCCESS) field program (year 2), and conduct a comprehensive analysis of field data (year 3). A scanning mirror pod attached to the DC-8 aircraft provides for scanning lidar observations ahead of the DC-8 and fixed-angle upward or downward observations. The lidar system installed within the DC-8 transmits 275 MJ at 1.06 gm wavelength or about 130 mJ at 1.06 and 0.53 gm simultaneously. Range-resolved aerosol backscatter is displayed in real time in terms of cloud contrail spatial distributions. The objectives of the project are to map contrail cloud vertical distributions ahead of DC-8 provide DC-8 guidance into enhanced scattering layers document DC-8 flight path intersection of contrail and cloud geometries (in-situ measurement positions relative to cloud contrail shape and an extension of in-situ measurements into the vertical -- integrated contrail cloud properties) analyze contrail cloud radiative properties with LIRAD (combined lidar and radiometry) technique evaluate mean particle sizes of aircraft emissions from two-wavelength observations study contrail cloud interactions, diffusion, and mass decay growth and make observations in the near-field of aircraft engine emissions. The scanning mirror pod may also provide a scanning capability for other remote sensing instruments.
报告类型：	科技报告