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| Impact of Vertical Sensible Heat Advection on Differences between LAS and EC Measured Sensible Heat Flux over the Loess Plateau in Central Gansu, China |
| Hao Xiaocui1,2, Zhang Qiang1,3, Yang Zesu3 |
1. Key laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China;
2. Northwest Regional Climate Center, Lanzhou 730020, China;
3. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China |
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Abstract Using the observation data of Experimental Study of Land Surface Processes in Chinese Loess Plateau (LOPEX) for the period of June, 2010 at Dingxi observation station, this article compared the differences between LAS and EC observed sensible heat flux by introducing the vertical sensible heat advection as an effective surface energy to sensible heat flux of EC observation. The results suggested that the mainly air movement at Dingxi observation station is upward with the max value of 0.074 m·s-1, providing the necessary dynamic conditions for vertical advection. Furthermore, for the site locating at semi-arid areas, the surface is well heated by solar radiation, and that causes a large temperature gradient near surface with a max value of 0.39 K·m-1, which provides the energy basis for generating vertical advection. When the contribution of vertical sensible heat advection is taken into consideration, the daily average surface energy unclosure of EC reduced from 0.30 to 0.24, and the linear fitting coefficient between LAS and EC measured sensible heat flux reduced from 1.258 to 1.186, which indicates that the differences between LAS and EC measured sensible heat flux could be reduced after the correction.
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Received: 14 May 2014
Published: 20 January 2015
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2015, Vol. 35 
