Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jhydrol.2013.08.026 |
Representing the root water uptake process in the Common Land Model for better simulating the energy and water vapour fluxes in a Central Asian desert ecosystem | |
Li, L.1,2; van der Tol, C.2; Chen, X.1; Jing, C.1,3,4; Su, B.2; Luo, G.1; Tian, X.2 | |
通讯作者 | Li, L. |
来源期刊 | JOURNAL OF HYDROLOGY |
ISSN | 0022-1694 |
EISSN | 1879-2707 |
出版年 | 2013 |
卷号 | 502页码:145-155 |
英文摘要 | The ability of roots to take up water depends on both root distribution and root water uptake efficiency. The former can be experimentally measured, while the latter is extremely difficult to determine. Yet a correct representation of root water uptake process in land surface models (LSMs) is essential for a correct simulation of the response of vegetation to drought environment. This study evaluates the performance of the Common L and Model (CLM) to reproduce energy and water vapour fluxes measured with an eddy covariance system in a Central Asian desert ecosystem. The default CLM appears to be able to reproduce observed net radiation, soil subsurface temperature, and wet period latent (Q(ie)) and sensible heat (Q(h)) fluxes, but significantly underestimate Q(ie) and overestimate Qt during dry period. Underestimation of Qie is attributed to the inappropriate representation of root water uptake process in the CLM model. Modifying the original root water uptake function (RWUF) with a linear function of soil water potential to one with an exponential function significantly improves the performances for both Q(ie) and Q(h). The net radiation and ground heat flux simulations did not change noticeable with the new RWUF. It is concluded that an exponential RWUF is a valuable improvement of the CLM model and likely for other similar LSMs that use a linear RWUF for Central Asian desert ecosystems. (C) 2013 Elsevier B.V. All rights reserved. |
英文关键词 | Root water uptake efficiency Land surface modelling Desert shrubs Evapotranspiration |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China ; Netherlands |
收录类别 | SCI-E |
WOS记录号 | WOS:000326768100015 |
WOS关键词 | BALANCE CLOSURE ; SURFACE MODELS ; CARBON ; FLUXNET ; HEAT ; RADIATION ; DROUGHT ; ERRORS ; CO2 |
WOS类目 | Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources |
WOS研究方向 | Engineering ; Geology ; Water Resources |
来源机构 | 中国科学院新疆生态与地理研究所 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/178518 |
作者单位 | 1.Chinese Acad Sci, State Key Lab Desert & Oasis Ecol, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China; 2.Univ Twente, Fac Geoinformat Sci & Earth Observat ITC, NL-7500 AE Enschede, Netherlands; 3.Chinese Acad Sci, Grad Sch, Beijing, Peoples R China; 4.Chinese Acad Forestry, Inst Forest Informat Resource Tech, Beijing, Peoples R China |
推荐引用方式 GB/T 7714 | Li, L.,van der Tol, C.,Chen, X.,et al. Representing the root water uptake process in the Common Land Model for better simulating the energy and water vapour fluxes in a Central Asian desert ecosystem[J]. 中国科学院新疆生态与地理研究所,2013,502:145-155. |
APA | Li, L..,van der Tol, C..,Chen, X..,Jing, C..,Su, B..,...&Tian, X..(2013).Representing the root water uptake process in the Common Land Model for better simulating the energy and water vapour fluxes in a Central Asian desert ecosystem.JOURNAL OF HYDROLOGY,502,145-155. |
MLA | Li, L.,et al."Representing the root water uptake process in the Common Land Model for better simulating the energy and water vapour fluxes in a Central Asian desert ecosystem".JOURNAL OF HYDROLOGY 502(2013):145-155. |
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