FAO-56 Dual Model Combined with Multi-Sensor Remote Sensing for Regional Evapotranspiration Estimations

Remote Sensing

Rim Amri³  Mehrez Zribi³  Zohra Lili-Chabaane²  Camille Szczypta³  Jean Christophe Calvet¹ 

[1] CNRM-GAME, Météo-France, CNRS, URA 1357, 42 avenue Gaspard Coriolis, 31057 Toulouse Cedex 1, France; E-Mail:;GREF, Université de Carthage/INAT, 43, Avenue Charles Nicolle 1082-Tunis-Mahrajène, Tunisia; E-Mail:;CESBIO/UMR 5126, 18 av. Edouard Belin, bpi 2801, 31401 Toulouse Cedex 9, France; E-Mails:

关键词: evapotranspiration;    FAO-56;    NDVI;    soil moisture;    ERS/WSC;    SPOT-VGT;   

DOI  :  10.3390/rs6065387

来源: mdpi

【 摘 要 】

The main goal of this study is to evaluate the potential of the FAO-56 dual technique for the estimation of regional evapotranspiration (ET) and its constituent components (crop transpiration and soil evaporation), for two classes of vegetation (olives trees and cereals) in the semi-arid region of the Kairouan plain in central Tunisia. The proposed approach combines the FAO-56 technique with remote sensing (optical and microwave), not only for vegetation characterization, as proposed in other studies but also for the estimation of soil evaporation, through the use of satellite moisture products. Since it is difficult to use ground flux measurements to validate remotely sensed data at regional scales, comparisons were made with the land surface model ISBA-A-gs which is a physical SVAT (Soil–Vegetation–Atmosphere Transfer) model, an operational tool developed by Météo-France. It is thus shown that good results can be obtained with this relatively simple approach, based on the FAO-56 technique combined with remote sensing, to retrieve temporal variations of ET. The approach proposed for the daily mapping of evapotranspiration at 1 km resolution is approved in two steps, for the period between 1991 and 2007. In an initial step, the ISBA-A-gs soil moisture outputs are compared with ERS/WSC products. Then, the output of the FAO-56 technique is compared with the output generated by the SVAT ISBA-A-gs model.

【 授权许可】

CC BY   
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