Surface renewal measurements of sensible heat flux in an irrigated desert pecan orchard

Surface renewal (SR) measurements were taken with a fine wire thermocouple at several heights in a 12.8m tall, open-rowed, irrigated pecan orchard in Las Cruces, New Mexico. Data in this paper were taken with the canopy completely foliated, 13 Oct to 12 Nov in 2003, completely defoliated from 26 Feb to 6 March in 2004, and during the emerging foliage stage from 1 April to 21 April. The SR measurements of sensible heat (H), taken at four different heights, are compared to simultaneous eddy covariance (EC) measurements of H at z =17m. Measurements compared most favorably with the SR sensor at 9.1 m or .7h. SR measurements were unreliable during the transition periods at dawn and dusk.