Revisiting the hysteresis effect in surface energy budgets. Issue 9 (15th May 2013)

• Record Type: Journal Article
• Authors: Sun, Ting; Wang, Zhi‐Hua; Ni, Guang‐Heng
• Is Part Of: Geophysical research letters. Volume 40:Issue 9(2013:May)
• Page Start: 1741
• Page End: 1747
• Publication Date: 2013-05-15
• Subjects: Hysteresis effect -- Surface Energy Budgets -- Wave phase -- Soil water; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/grl.50385
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract : [1] The hysteresis effect in diurnal cycles of net radiation Rn 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. Rn 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 Rn 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. Key Points: We physically characterize the hysteresis effect between Rn and G0 Wave phase evolution dictates the pattern of hysteresis loops Model predictions are consistent with field measurements and empirical models