Cheng-I Hsieh

TL;DR: In this article, an approximate analytical model was developed to estimate scalar flux footprint in thermally stratified atmospheric surface layer flows based on a combination of Lagrangian stochastic dispersion model results and dimensional analysis.

TL;DR: In this paper, a spatial variability experiment, in which EC measurements were made from six towers within the roughness sublayer (RSL) in a uniform pine plantation, quantified large and dynamic spatial variation in fluxes.

TL;DR: In this article, the Monin and Obukhov (1954) variance similarity functions were compared with direct measurements for momentum and heat but not for water vapor, and it was demonstrated that the non-uniformity in water vapor sources reduced the surface flux when compared to an equivalent uniform terrain subjected to identical shear stress, sensible heat flux, and atmospheric water vapor variance.

TL;DR: In this article, the authors analyzed the ejection-sweep properties using velocity and scalar fluctuation measurements over tall natural grass and bare soil surfaces and showed that momentum ejections and sweeps occur at equal frequencies (D eject ≈ D sweep ≈ 0.29) irrespective of surfaceroughness length or atmospheric stability conditions.

TL;DR: In this paper, the authors analyzed the ejection-sweep properties at the canopy-atmosphere interface of a 13 m tall, uniformly aged southern loblolly pine stand and a 33m tall, unevenly aged hardwood stand using velocity and scalar (temperature, water vapor, and carbon dioxide) fluctuation measurements.