| This article has been：Browse 125Times Download 110Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2022417 |
|
| Research Progress on Influencing Factors in the Energy Closure of Eddy Covariance Systems |
|
HU Qian, DOU Chaoyin, WEI Zheng, ZHANG Baozhong,
CHEN He, HAN Congying, ZHANG Di
|
|
1. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; 2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research,
Beijing 100038, China; 3. National Center for Efficient Irrigation Engineering and Technology Research, Beijing 100048, China
|
| Abstract: |
| The energy balance ratio is the key index to objectively evaluate the material and energy exchange of ecosystem, but the phenomenon of energy balance unclosure is common, and the unclosure rate is 10%~30%. Based on the existing research at home and abroad, this paper systematically discusses the reasons for the unclosure of energy balance from the perspectives of instrument measurement error, scale mismatch of observation source area, eddies and advection of complex underlying surface, neglect of relevant energy terms and influence of rainfall process. In particular, the reliability of eddy covariance in measuring flux during rainfall is worth discussing. It clearly points out the breakthrough point and development direction of future research, that is, from the aspects of the calculation applicability of energy storage terms, considering root soil heat storage and canopy heat storage as additional heat sources, and multi station observation methods to further improve the energy balance ratio. |
| Key words: eddy covariance; energy balance ratio; turbulent fluxes; rainfall |
|
|
