Arid
DOI10.1016/j.agwat.2012.12.019
Estimation of ETo with Hargreaves-Samani and FAO-PM temperature methods for a wide range of climates in Iran
Raziei, Tayeb1,2; Pereira, Luis S.2
通讯作者Raziei, Tayeb
来源期刊AGRICULTURAL WATER MANAGEMENT
ISSN0378-3774
EISSN1873-2283
出版年2013
卷号121页码:1-18
英文摘要

Monthly data records of 40 Iranian stations distributed over the country, for the period 1971-2005, were utilized for estimation of reference evapotranspiration (ETo) using Penman-Monteith (PM-ETo), Hargreaves-Samani (HS) and FAO-PM temperature (PMT) methods. To estimate ETo with HS and PMT methods, appropriate k(Rs), an empirical radiation adjustment coefficient, were considered for each station, whereas T-min was adjusted for estimation of T-dew and used only for PMT computation. It was found that the appropriate k(Rs) for both HS and PMT methods are identical for a given station and it is generally smaller in sub-humid and humid than in semi-arid to hyper-arid climates. The performance of the PMT was further improved in both arid and humid climates when T-min was adjusted. The result suggested that the HS and PMT methods appropriately predict ETo for all climatic regions of Iran if the appropriate k(Rs) was utilized. However, the considered methods showed weak performances for some stations in arid and hyper-arid climates of eastern and southern Iran owing to the effect of extreme and variable wind speed inherent in the PM-ETo. Thus, the role played by wind speed in ETo estimation was examined; the result indicated that the existence of extreme winds, and also the time variability of wind speed, is responsible for the observed discrepancies between PMT and PM-ETo estimates. The spatial patterns of ETo computed with HS and PMT methods found to be identical and resemble to that of PM-ETo, all showing a gradual increasing from north to south, with the lowest ETo values observed over northern humid and sub-humid climates of Iran and larger ETo for arid and hyper-arid climates in the southern and eastern country. Results indicated that the HS and PMT methods are appropriate alternatives for estimation of ETo for all climatic regions of Iran. (c) 2013 Elsevier B.V. All rights reserved.


英文关键词Reference evapotranspiration Dew point temperature Radiation adjustment coefficient Temperature adjustment Humid vs. arid regions Wind speed Spatial variability
类型Article
语种英语
国家Iran ; Portugal
收录类别SCI-E
WOS记录号WOS:000317889900001
WOS关键词ESTIMATING REFERENCE EVAPOTRANSPIRATION ; PENMAN-MONTEITH REFERENCE ; REFERENCE CROP EVAPOTRANSPIRATION ; ESTIMATING SOLAR-RADIATION ; WEATHER FORECAST MESSAGES ; AIR-TEMPERATURE ; EQUATION ; PRECIPITATION ; ACCURACY ; TRENDS
WOS类目Agronomy ; Water Resources
WOS研究方向Agriculture ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/175580
作者单位1.SCWMRI, Tehran, Iran;
2.Univ Tecn Lisboa, Inst Agron, CEER Biosyst Engn, Lisbon, Portugal
推荐引用方式
GB/T 7714
Raziei, Tayeb,Pereira, Luis S.. Estimation of ETo with Hargreaves-Samani and FAO-PM temperature methods for a wide range of climates in Iran[J],2013,121:1-18.
APA Raziei, Tayeb,&Pereira, Luis S..(2013).Estimation of ETo with Hargreaves-Samani and FAO-PM temperature methods for a wide range of climates in Iran.AGRICULTURAL WATER MANAGEMENT,121,1-18.
MLA Raziei, Tayeb,et al."Estimation of ETo with Hargreaves-Samani and FAO-PM temperature methods for a wide range of climates in Iran".AGRICULTURAL WATER MANAGEMENT 121(2013):1-18.
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