Air and Surface Temperature Coupling in the Convective Atmospheric Boundary Layer

摘要

In a convective boundary layer, coherent structures were detected through their thermal signature on anartificial turf surface using high-frequency thermal infrared (TIR) imagery and surface layer turbulencemeasurements. The coherent structures cause surface temperature variations over tens of seconds and spatialscales of tens to a few hundred meters. Evidence of processes similar to those in a renewal event was observed.Spatial and temporal correlation analysis revealed the geometric and velocity information of the structures atthe ground footprint of air temperature measurements. The velocity of the coherent structures was consistentwith the wind speed at 6.5 m AGL. Practical implications of turbulence-driven surface temperature variabilityfor thermal remote sensing are also discussed.