Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/piahs-380-17-2018 |
Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands | |
Boulet, Gilles1; Delogu, Emilie1; Saadi, Sameh1,2; Chebbi, Wafa1,2; Olioso, Albert3; Mougenot, Bernard1; Fanise, Pascal1; Lili-Chabaane, Zohra2; Lagouarde, Jean-Pierre4 | |
通讯作者 | Boulet, Gilles |
会议名称 | 4th Remote Sensing and Hydrology Symposium (RSHS) |
会议日期 | MAY 08-10, 2018 |
会议地点 | Cordoba, SPAIN |
英文摘要 | EvapoTranspiration (ET) is an important component of the water cycle, especially in semi-arid lands. Its quantification is crucial for a sustainable management of scarce water resources. A way to quantify ET is to exploit the available surface temperature data from remote sensing as a signature of the surface energy balance, including the latent heat flux. Remotely sensed energy balance models enable to estimate stress levels and, in turn, the water status of most continental surfaces. The evaporation and transpiration components of ET are also just as important in agricultural water management and ecosystem health monitoring. Single temperatures can be used with dual source energy balance models but rely on specific assumptions on raw levels of plant water stress to get both components out of a single source of information. Additional information from remote sensing data are thus required, either something specifically related to evaporation (such as surface water content) or transpiration (such as PRI or fluorescence). This works evaluates the SPARSE dual source energy balance model ability to compute not only total ET, but also water stress and transpiration/evaporation components. First, the theoretical limits of the ET component retrieval are assessed through a simulation experiment using both retrieval and prescribed modes of SPARSE with the sole surface temperature. A similar work is performed with an additional constraint, the topsoil surface soil moisture level, showing the significant improvement on the retrieval. Then, a flux dataset acquired over rainfed wheat is used to check the robustness of both stress levels and ET retrievals. In particular, retrieval of the evaporation and transpiration components is assessed in both conditions (forcing by the sole temperature or the combination of temperature and soil moisture). In our example, there is no significant difference in the performance of the total ET retrieval, since the evaporation rate retrieved from the sole surface temperature is already fairly close to the one we can reconstruct from observed surface soil moisture time series, but current work is underway to test it over other plots. |
来源出版物 | EARTH OBSERVATION FOR INTEGRATED WATER AND BASIN MANAGEMENT: NEW POSSIBILITIES AND CHALLENGES FOR ADAPTATION TO A CHANGING ENVIRONMENT, VOL 380 |
ISSN | 2199-899X |
出版年 | 2018 |
卷号 | 380 |
页码 | 17-22 |
EISBN | ***************** |
出版者 | COPERNICUS GESELLSCHAFT MBH |
类型 | Proceedings Paper |
语种 | 英语 |
国家 | France;Tunisia |
收录类别 | CPCI-S |
WOS记录号 | WOS:000466550700003 |
WOS类目 | Remote Sensing ; Water Resources |
WOS研究方向 | Remote Sensing ; Water Resources |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/307574 |
作者单位 | 1.Univ Toulouse, CESBIO, CNES, CNRS,IRD,UPS, Toulouse, France; 2.Univ Carthage, Inst Natl Agron Tunisie, Tunis, Tunisia; 3.Univ Avignon & Pays Vaucluse, INRA, EMMAH, Avignon, France; 4.INRA, Bordeaux Sci Agro, ISPA, Villenave Dornon, France |
推荐引用方式 GB/T 7714 | Boulet, Gilles,Delogu, Emilie,Saadi, Sameh,et al. Evapotranspiration and evaporation/transpiration partitioning with dual source energy balance models in agricultural lands[C]:COPERNICUS GESELLSCHAFT MBH,2018:17-22. |
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