Characterizing physical relationships between the sensible, latent and ground heat flux at the Earth surface is of crucial importance in studying the global energy, water, and carbon cycles. Here we demonstrate an analogy between the daily mean turbulent heat transfer in the atmospheric surface layer and conductive-advective heat transfer in soil. This finding, in conjunction with temperature continuity at the land–atmosphere interface, uncovers a physical linkage between sensible and ground heat flux. The proposed relationship and its ramification for estimation of latent heat flux are validated based on daily averaged data from six AmeriFlux eddy covariance stations in North America over a wide range of land covers and climate regimes.
Bibliographical noteFunding Information:
We gratefully acknowledge support from the NASA Terrestrial Hydrology Program (THP, #80NSSC18K152) through Dr. J. Entin and the New (Early Career) Investigator Program (NIP, #80NSSC18K0742) through Dr. T. Lee and Dr. A. Leidner. Partial support of this study is provided by the NASA NEWS Program (NNX15AT41G) and NSF CZO Program (EAR-1331846). Data used in this study were acquired from the AmeriFlux stations and are available at https://ameriflux.lbl.gov/ .
© 2021 Elsevier B.V.
- Bulk heat transfer
- Surface energy balance
- Turbulent eddy diffusion