Comparison of methods for determining boundary layer height during the 2010 CAPABLE summer intensive

In support of NASA’s GEO-CAPE mission and Air Quality Applied Sciences, the Chemistry and Physics Atmospheric Boundary Layer Experiment (CAPABLE) site at NASA Langley Research Center has been established in coordination with Environmental Protection Agency (EPA) and Virginia Department of Environmental Quality (VA DEQ) to assess the relationship between high temporal resolution measurements from space and continuous in situ surface observations. Coincident boundary layer height information is a key measurement for understanding the relationship between in situ and column data. During the 2010 CAPABLE summer intensive, four methods for determining boundary layer height were utilized. Continuous profile measurements of temperature and humidity were provided using the Hampton University Atmospheric Sounder Spectrometer for Infrared Spectral Technology (ASSIST). Wind profiles were provided by a Leosphere WLS70 wind lidar and aerosol profiles were obtained from the NASA Langley Compact Aerosol Lidar (CAL). Rawinsondes were launched intermittently throughout the measurement period. We present preliminary results of the variability in boundary layer height determined from the four different instrument methods and discuss the temporal evolution of the mixed layer and characterization of flow regimes during high ozone episodes. Disclaimer: Although this work was reviewed by the U.S. Environmental Protection Agency and National Aeronautics and Space Administration, and approved for publication, it may not necessarily reflect official Agency policy.