DOI: 10.1002/2016JD025744
论文题名: Incorporating root hydraulic redistribution and compensatory water uptake in the Common Land Model: Effects on site level and global land modeling
作者: Zhu S. ; Chen H. ; Zhang X. ; Wei N. ; Shangguan W. ; Yuan H. ; Zhang S. ; Wang L. ; Zhou L. ; Dai Y.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 14 起始页码: 7308
结束页码: 7322
语种: 英语
英文关键词: compensatory water uptake
; hydraulic redistribution
; land surface model
; root water uptake
英文摘要: Treatment of plant water uptake through the roots remains a significant issue in land surface models. Most current land surface models calculate the root water uptake (RWU) by extracting soil water in different soil layers based on the relative soil water availability and the root fraction of each layer within the rooting zone. This approach is also used as the default in the Common Land Model (CoLM). This approach often significantly underestimates plant transpiration during dry periods. Therefore, more realistic RWU functions are needed in land surface models. In this study, the modified CoLM with root hydraulic redistribution (HR) and compensatory water uptake (CWU) was evaluated against the CoLM with the default approach by comparing the observed and simulated latent and sensible heat fluxes observed from three sites that experience seasonal drought over the measured periods. We found that the CoLM using the default RWU significantly underestimated latent heat fluxes and overestimated the sensible heat fluxes over dry periods, whereas those biases were significantly reduced by the CoLM with HR and CWU functions. We also ran global offline simulations using the revised CoLM to evaluate the performance of these alternative RWU functions on the global scale. Compared with the estimated latent heat fluxes from the FLUXNET-model tree ensemble model product, CoLM with HR and CWU functions significantly improved the estimated latent heat fluxes over the Amazon, Southern Africa, and Central Asia during their dry seasons. Therefore, we recommend the implementation of HR and CWU in land surface models. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: 41405096
; 41575072
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62636
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; College of Global Change and Earth System Science, Beijing Normal University, Beijing, China; School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou, China
Recommended Citation:
Zhu S.,Chen H.,Zhang X.,et al. Incorporating root hydraulic redistribution and compensatory water uptake in the Common Land Model: Effects on site level and global land modeling[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(14)