Penman and Priestley-Taylor approaches in Atmospheric Boundary-Layer Dynamics
- 1School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing, China (jy12@princeton.edu)
- 2Department of Civil and Environmental Engineering, Princeton University, Princeton, USA (aporpora@princeton.edu)
By linearizing the saturation water vapor curve, Penman (1948) not only found the famous explicit approximation of wet-surface evaporation but also obtained a less well-known expression of surface temperature. Here the latter has been taken into the slab model of Atmospheric Boundary Layer (ABL) to derive multiple analytical approximations of ABL dynamics, which share the features of the Penman equation with evaporation driven by energy and drying power of the air. Noticing that these two parts of evaporation are proportional to each other within the Priestley-Taylor approximation at sub-daily timescale, a unified framework is obtained that links the Penman approach and Priestley-Taylor method to the diurnal behaviors of ABL. The resulting model is useful for diagnosing the land-atmosphere interactions.
How to cite: Yin, J. and Porporato, A.: Penman and Priestley-Taylor approaches in Atmospheric Boundary-Layer Dynamics, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-9216, https://doi.org/10.5194/egusphere-egu2020-9216, 2020.
