DOI: 10.1016/j.jag.2014.06.008
Scopus记录号: 2-s2.0-84904729409
论文题名: Assessment of reference evapotranspiration using remote sensing andforecasting tools under semi-arid conditions
作者: Cruz-Blanco M ; , Gavilán P ; , Santos C ; , Lorite I ; J
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 33, 期: 1 起始页码: 280
结束页码: 289
语种: 英语
英文关键词: Advection
; ECMWF
; Lysimeter
; MSG
; Reference evapotranspiration
; Remote sensing
Scopus关键词: advection
; air temperature
; assessment method
; evapotranspiration
; forecasting method
; lysimeter
; remote sensing
; semiarid region
; solar radiation
; weather forecasting
; Spain
英文摘要: Reference evapotranspiration (ETo) assessment at regional scale is a challenge to agricultural and hydro-logical research requiring the characterization of vast areas to obtain accurate meteorological variables.To account for this, a new approach considering a modified version of the Makkink equation and basedon a combination of remotely sensed solar radiation (Rs) considering the MSG satellite, and numericalweather forecast of near surface air temperature (T2m), was developed. The new approach is referred asMakkink-Advection equation (MAK-Adv).Once Rs and T2m were validated for the semiarid conditions registered in Southern Spain with very sat-isfactory results (RMSE = 1.6 MJ m-2d-1and 1.4°C respectively, with linear regressions with slope = 0.99and R2= 0.97), the MAK-Adv approach was calibrated and validated with ETo easurements from aweighing lysimeter under near-reference conditions in Southern Spain. The new approach has pro-vided accurate daily EToestimations compared with lysimeter data (RMSE = 0.50 mm d-1, RE = 12.3% andMAE = 0.39 mm d-1), and remains accurate during summer time (RMSE = 0.62 mm d-1 and RE = 9%), thecritical period when accurate ETodata are essential for a correct agricultural water management.Once calibrated and validated, and thanks to the use of remotely sensed data, the MAK-Adv approachallowed the EToassessment at regional scale. For a semi-arid region located in southern Spain with an areaof 87,300 km2, a detailed spatial EToassessment was performed, determining ETovalues for the totalityof the area with a resolution of about 9 km2allowing to evaluate the spatial and temporal variabilityat basin/region scale. This new approach gets over the serious limitations for a correct ETo assessmentwhen traditional methodologies are not able to provide these data for vast areas, even with the modernweather station networks. Thus, MAK-Adv approach is especially useful for those areas with missing orinaccurate meteorological in situ observations. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79759
Appears in Collections: 气候变化事实与影响
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作者单位: IFAPA-Centro Alameda del Obispo, Regional Government of Andalusia, Córdoba, Spain
Recommended Citation:
Cruz-Blanco M,, Gavilán P,, Santos C,et al. Assessment of reference evapotranspiration using remote sensing andforecasting tools under semi-arid conditions[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,33(1)