Publication Date:
2013-03-24
Description:
[1] The hysteresis effect in diurnal cycles of net radiation R n and ground heat fluxG 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 temperatureas two control parameters of the surface energy partitioning. The theoretical analysis shows that the vertical water flux W and the scaled ratio (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.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
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