The Canopy Horizontal Array Turbulence Study

• DOI: 10.1175/2010bams2614.1
• Publication Date: 2010-12-17T22:09:19Z
• Authors: Edward G. Patton; Thomas W. Horst; Peter P. Sullivan; Donald H. Lenschow; Steven P. Oncley; William O. J. Brown; Sean P. Burns; Alex B. Guenther; Andreas Held; Thomas Karl; Shane D. Mayor; Luciana V. Rizzo; Scott M. Spuler; Jielun Sun; Andrew A. Turnipseed; Eugene J. Allwine; Steven L. Edburg; Brian K. Lamb; Roni Avissar; Ronald J. Calhoun; Jan Kleissl; William J. Massman; Kyaw Tha Paw U; Jeffrey C. Weil
• Keywords: Instrumentation; SODAR

The Canopy Horizontal Array Turbulence Study (CHATS) took place in spring 2007 and is the third series of (HATS) experiments. HATS experiments have been instrumental testing developing subfilterscale (SFS) models for large-eddy simulation (LES) planetary boundary layer (PBL) turbulence. CHATS campaign a deciduous walnut orchard near Dixon, California, was designed to examine impacts vegetation on SFS Measurements were collected both prior following leafout capture impact leaves turbulence, stratification, scalar source/sink distribution. utilized crosswind arrays fast-response instrumentation investigate canopy-imposed distribution momentum extraction sources transport momentum, energy, three scalars. To directly test link with PBL parameterizations canopy-modified turbulent exchange, also included 30-m profile tower instrumented turbulence instrumentation, fast slow chemical sensors, aerosol samplers, radiation instrumentation. A highresolution scanning backscatter lidar characterized structure above within canopy; Doppler lidar, mini sodar/radio acoustic sounding system (RASS), new helicopter-observing platform provided details PBL-scale flow. Ultimately, dataset will lead improved energy from vegetation, which are critical component global regional land, atmosphere, models. This manuscript presents an overview experiment, documents regime sampled, highlights some preliminary key findings.