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Turbulent transport of momentum and scalars in the atmospheric surface layer

Speaker: Dan Li, Graduate Student
Series: EEWR Brown Bag Seminars
Location: Engineering Quad E219
Date/Time: Friday, February 18, 2011, 12:00 p.m. - 1:00 p.m.

Abstract:

Turbulent transport of momentum and scalars(e.g. temperature, water vapor and trace gases) in the atmospheric surface layer plays important roles in many disciplines such as meteorology, hydrology, agriculture and so on. It has long been assumed that turbulence transports all the scalars similarly, and this similarity assumption is often extended to include momentum which is usually referred to as the Reynolds analogy. This presentation will mainly focus on the dissimilarity between turbulent transport between momentum and scalars, and among different scalars, trying to establish a link between turbulent structures, transport efficiencies and similarity functions. A new scheme for surface heat flux based on "atmospheric heat engine" concept is also proposed.