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Atmosphere 2017, 8(5), 87; doi:10.3390/atmos8050087

Understanding the Partitioning of the Available Energy over the Semi-Arid Areas of the Loess Plateau, China

Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
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Academic Editor: Andres Schmidt
Received: 16 March 2017 / Revised: 14 May 2017 / Accepted: 16 May 2017 / Published: 22 May 2017
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Abstract

To investigate the mechanism of available energy partitioning to sensible and latent heat fluxes over semi-arid regions, data from the Semi-Arid Climate and Environment Observatory of Lanzhou University (SACOL) were analyzed to assess the effects of soil moisture, net radiation, and vapor pressure deficit (VPD) on available energy partitioning, as quantified by Bowen ratio. It was found that the Bowen ratio decreased rapidly with increasing soil moisture when soil was dry but was insensitive to the change in soil moisture when soil became wet. Net radiation and VPD affected the sensitivity of the Bowen ratio to soil moisture under dry conditions and the soil moisture threshold above which the Bowen ratio became insensitive to soil moisture. The Bowen ratio increases with net radiation at a high level of VPD, while the Bowen ratio first increases and then decreases with net radiation at a low level of VPD. Reduced soil moisture enhanced the effects of the net radiation and VPD on available energy partitioning. The effects of the VPD on Bowen ratio depended on the relative strength of the positive and negative impacts of VPD on the latent heat flux under different soil and net radiation conditions. View Full-Text
Keywords: available energy partitioning; soil moisture; net radiation; vapor pressure deficit; semi-arid areas available energy partitioning; soil moisture; net radiation; vapor pressure deficit; semi-arid areas
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Yuan, G.; Zhang, L.; Liang, J.; Cao, X.; Liu, H.; Yang, Z. Understanding the Partitioning of the Available Energy over the Semi-Arid Areas of the Loess Plateau, China. Atmosphere 2017, 8, 87.

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