DeWitt Field Study: Surface Flux Observations, in-Situ Soundings, and Remote Sensing of Conditions Affecting the Behavior of the Mixed Layer over Land

摘要

The DeWitt field study, conducted July 10 to 21, 1979, provides information on the structure of the lower 2 km of the atmosphere and the surface boundary conditions for flat farmland in central Illinois. Mean wind and temperature profiles in the lower atmosphere were measured by in-situ soundings both with high-resolution miniature radiosondes and an instrument package carried aloft by a kytoon. The height and depth of the entrainment zone at the top of the boundary layer, and some wind velocity component means and turbulence statistics were measured with lidar and sodar remote sensing systems. Standard meteorological surface observations, measurements of solar and net radiation, and eddy fluxes of momentum, heat, water vapor, and ozone over a local maize canopy complete the body of data collected. This report summarizes methods of observation and data reduction and presents the processed data in tabular and graphic forms in a series of appendices. These results can be used to test models of planetary boundary layer behavior, including the influences of surface fluxes and entrainment aloft on the variation of mixed layer heights and mixing processes in the boundary layer. (ERA citation 11:028188)