The influence of observed and modelled net longwave radiation on the rate of estimated potential evapotranspiration

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F19%3A00500537" target="_blank" >RIV/67985874:_____/19:00500537 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/19:10397089

Result on the web

<a href="http://hdl.handle.net/11104/0297522" target="_blank" >http://hdl.handle.net/11104/0297522</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2478/johh-2019-0011" target="_blank" >10.2478/johh-2019-0011</a>

Result language

angličtina

Original language name

The influence of observed and modelled net longwave radiation on the rate of estimated potential evapotranspiration

Original language description

Longwave radiation, as part of the radiation balance, is one of the factors needed to estimate potential evapotranspiration (PET). Since the longwave radiation balance is rarely measured, many computational methods have been designed. In this study, we report on the difference between the observed longwave radiation balance and modelling results obtained using the two main procedures outlined in FAO24 (relying on the measured sunshine duration) and FAO56 (based on the measured solar radiation) manuals. The performance of these equations was evaluated in the April-October period over eight years at the Liz experimental catchment and grass surface in the Bohemian Forest (Czech Republic). The coefficients of both methods, which describe the influence of cloudiness factor and atmospheric emissivity of the air, were calibrated. The Penman-Monteith method was used to calculate the PET. The use of default coefficient values gave errors of 40-100 mm (FAO56) and 0-20 mm (FAO24) for the seasonal PET estimates (the PET was usually overestimated). Parameter calibration decreased the FAO56 error to less than 20 mm per season (FAO24 remained unaffected by the calibration). The FAO56 approach with calibrated coefficients proved to be more suitable for estimation of the longwave radiation balance.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10501 - Hydrology

Project

<a href="/en/project/GA16-05665S" target="_blank" >GA16-05665S: Soil water regime in headwater catchments under climatic stress</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Hydrology and Hydromechanics

ISSN

0042-790X

e-ISSN

—

Volume of the periodical

67

Issue of the periodical within the volume

3

Country of publishing house

SK - SLOVAKIA

Number of pages

9

Pages from-to

280-288

UT code for WoS article

000473006300009

EID of the result in the Scopus database

2-s2.0-85068317902