An Empirical Simplification of the Temperature Penman-Monteith Model for the Tropics

Eric Kra

Journal of Agricultural Science, 2010, vol. 2, issue 1, 162

Abstract: A simple empirical equation (EPM) is presented to considerably shorten the computational steps required to estimatereference grass evapotranspiration (ETo) in the tropics using the FAO-56 Penman-Monteith equation (TPM) when theonly available weather data are those of temperature. Generally EPM predicted TPM ETo with very high efficiencies,achieving statistical performance measures as high as r2 =1.00 , E1 = 0.98 , E2 =1.00, MAE=0.01 mm/day in testson data from six locations in four countries in West Africa. EPM was of general form , = b / /17000ETo EPM T Rs k ? Ra? ,where ETo = reference grass ETo (MJ m?2 d ?1 ), T = daily average air temperature ( o C), Rs = estimated solarradiation (MJ m ?2 d ?1 ), Ra = computed extraterrestrial radiation (MJ m ?2 d ?1 ); b , k , and ? , were parameterscomputed from local latitude and temperature data. The simplicity of EPM is expected to encourage wider usage ofTPM ETo estimates which are more accurate than estimates obtained by using locally-uncalibrated versions of simplerETo models where only temperature data are available.

Date: 2010
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://ccsenet.org/journal/index.php/jas/article/download/3886/4373 (application/pdf)
https://ccsenet.org/journal/index.php/jas/article/view/3886 (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:ibn:jasjnl:v:2:y:2010:i:1:p:162

Access Statistics for this article

More articles in Journal of Agricultural Science from Canadian Center of Science and Education Contact information at EDIRC.
Bibliographic data for series maintained by Canadian Center of Science and Education ().