Description

The hysteresis effect in diurnal cycles of net radiation R-n and ground heat flux G(0) has been observed in many studies, while the governing mechanism remains vague. In this study, we link the phenomenology of hysteresis loops to the wave

The hysteresis effect in diurnal cycles of net radiation R-n and ground heat flux G(0) has been observed in many studies, while the governing mechanism remains vague. In this study, we link the phenomenology of hysteresis loops to the wave phase difference between the diurnal evolutions of various terms in the surface energy balance. R-n and G(0) are parameterized with the incoming solar radiation and the surface temperature as two control parameters of the surface energy partitioning. The theoretical analysis shows that the vertical water flux W and the scaled ratio A(s)*/A(T)* (net shortwave radiation to outgoing longwave radiation) play crucial roles in shaping hysteresis loops of R-n and G(0). Comparisons to field measurements indicate that hysteresis loops for different land covers can be well captured by the theoretical model, which is also consistent with Camuffo-Bernadi formula. This study provides insight into the surface partitioning and temporal evolution of the energy budget at the land surface.

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Title
  • Revisiting the Hysteresis Effect in Surface Energy Budgets
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Date Created
2013-09-18
Resource Type
  • Text
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    Identifier
    • Digital object identifier: 10.1002/grl.50385
    • Identifier Type
      International standard serial number
      Identifier Value
      0094-8276
    • Identifier Type
      International standard serial number
      Identifier Value
      1944-8007
    Note
    • View the article as published at http://onlinelibrary.wiley.com/doi/10.1002/grl.50385/abstract.

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    Sun, T., Z.-H. Wang, and G.-H. Ni (2013), Revisiting the hysteresis effect in surface energy budgets, Geophysical Research Letters, 40, 1741–1747, doi:10.1002/grl.50385.

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