Temperature-Based Approaches for Estimating Reference Evapotranspiration

Trajković, Slaviša

doi:10.1061/(asce)0733-9437(2005)131:4(316)

Cited by 228 publications

(126 citation statements)

References 33 publications

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“…2); but temporal resolution of our data was too coarse to analyse changes in climate-growth relationships within a season. Nevertheless, significant effect of PET was also observed, indicating that moisture regime (Trajkovic 2005) affected height growth of clones with intermediate and late leaf flushing.…”

Section: Discussionmentioning

confidence: 98%

“…Thus, increasing heterogeneity of summer precipitation and temperature (Avotniece et al 2010) is likely to result in reduction of height growth. Positive effect of solar radiation on HI suggested that HI was enhanced by sunny days; however, sunny days in summer are usually warmer than cloudy days (LEGMC) thus facilitating PET (Trajkovic 2005) and potentially forming a negative feedback loop. Nevertheless, reasonable effect of non-tested factors on slow growing clones was still apparent as suggested by the lowest R-squared values (0.53) when both seasons were analysed together.…”

Section: Discussionmentioning

confidence: 99%

“…An extension of growing (vegetation) season due to climate changes can have negative effect on growth via increase of susceptibility to spring and autumn frosts (Gu et al 2008). Additionally, raised temperature in summer intensifies evapotranspiration (Trajkovic 2005) that might cause drought stress (Pallardy 2008;Berry and Downtown 2012). Although this is usual in arid regions (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Height increment of hybrid aspen Populus tremuloides x P. tremula as a function of weather conditions in central part of Latvia

Jansons¹,

Zeps²,

Rieksts-Riekstiņš³

et al. 2014

Silva Fenn.

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Height increment of hybrid aspen Populus tremuloides × P. tremula as a function of weather conditions in south-western part of Latvia Jansons Ā., Zeps M., Rieksts-Riekstiņš J., Matisons R., Krišāns O. (2014). Height increment of hybrid aspen Populus tremuloides × P. tremula as a function of weather conditions in southwestern part of Latvia. Silva Fennica vol. 48 no. 5 article id 1124. 13 p. Highlights• Intra-annual height growth of hybrid aspen was monitored.• Clones with early leaf flushing dates showed faster height growth.• Height growth was generally controlled by temperature.• Fast-growing hybrids were more robust to weather conditions than slow-growing ones.• Potential evapotranspiration (moisture regime) negatively affected height growth of clones with delayed phenology. AbstractHeight growth of young hybrid aspen (Populus tremula L. × P. tremuloides Michx.) was studied in relation to weather conditions. Height of clones with different leaf flushing phenology (early, intermediate and late) was monitored during the growing periods of 2010 and 2011 in a plantation established on former agricultural land. Mean daily height increment (HI) was calculated. Multiple linear regression was used to determine which weather factors (variables) had significant effect on HI. Mean seasonal height growth (mean seasonal HI) between clones (groups) was compared by ANOVA. In both years, HI was significantly higher for clones with early and intermediate leaf flushing compared to clones with late leaf flushing. The effect of weather factors also differed between clones according to their leaf flushing phenology; it was the weakest for HI of clones with early leaf flushing compared to clones with intermediate and late leaf flushing. Mean temperature was the main factor, which positively affected HI of all clones, suggesting that warmer climate might be beneficial for height growth of young hybrid aspen in Latvia. Nevertheless, significant negative relationship between HI and potential evapotranspiration (PET) was observed for clones with delayed leaf flushing, suggesting negative effect of increasing variability of precipitation on growth. Thus, the differences in height growth intensity might be related to growth sensitivity to weather conditions. On the other hand, such differences in height growth between clones might be caused by competition (i.e. with herbs), as trees with early leaf flushing might conquer more resources and become more robust against the environmental fluctuation.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Height increment of hybrid aspen Populus tremuloides x P. tremula as a function of weather conditions in central part of Latvia

Jansons¹,

Zeps²,

Rieksts-Riekstiņš³

et al. 2014

Silva Fenn.

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“…A necessidade de estimar a evapotranspiração de referência (ETo) com acurácia e por meio de um método simples vem sendo estudado por vários autores (ALLEN, 2003;FOOLADMAND et al, 2008;GAVILÁN et al, 2006;TRAJKOVIC, 2007). A razão é que o manejo da água e a produtividade das culturas podem ser melhorados em função da confiabilidade dos métodos utilizados para estimar a evapotranspiração das culturas.…”

Section: Introductionunclassified

Calibração regional e local da equação de Hargreaves para estimativa da evapotranspiração de referência

Fernandes¹,

Heinemann²,

Paz³

et al. 2012

Rev. Ciênc. Agron.

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Resumo -A equação de Penman-Monteith FAO-56 (ETo PM ) tem sido recomendada pela FAO, Organização para a Alimentação e Agricultura das Nações Unidas (ONU), como padrão para estimar a evapotranspiração de referência (ETo). Essa equação requer muitas variáveis que não estão disponíveis na maioria das estações meteorológicas no Brasil central. Por outro lado, a equação de Hargreaves é considerada simples e demanda somente dados de temperatura máxima e mínima para estimar a ETo. Entretanto, essa equação requer um ajuste local. Esse estudo analisa a possibilidade de utilizar a equação de Hargreaves ajustada para estimar a ETo no estado de Goiás. Para isso, os parâmetros empíricos, HC (coeficiente empírico de Hargreaves) e HE (expoente empírico de Hargreaves), da equação de Hargreaves foram ajustados considerando dois processos, ajuste local (HGR -Hargreaves ajuste local) e ajuste regional (HGL -Hargreaves ajuste regional). Para o HGL, os parâmetros empíricos foram ajustados para cada estação meteorológica. Já, para o HGR, os parâmetros empíricos foram ajustados considerando conjuntamente os dados de todas as estações meteorológicas. A equação de Hargreaves ajustada para ambos os processos, local e regional, apresentou valores de ERQM de 17,95 e 21,93%, respectivamente, considerando o conjunto total de dados climáticos. A equação de Hargreaves ajustada localmente ou regionalmente é uma opção para estimar os valores diários de ETo no Estado de Goiás em locais em que a disponibilidade de dados climáticos é limitada.Palavras-chave -Temperatura atmosférica. Evapotranspiração. Calibração. Abstract -The FAO-56 Penman-Monteith equation (ETo PM ) has been recommended by the Food and Agriculture Organization (FAO) of the United Nations as the standard equation for estimating reference evapotranspiration (ETo). The FAO-56 PM equation requires numerous weather data that are not available in most of the stations of Brazil central. On the other hand, the Hargreaves equation is a more simple equation for estimating ETo, and demands only maximum and minimum temperature data. However, this equation requires local calibration. This paper examines the potential of using the Hargreaves equation adjusted to estimate the ETo in Goiás State. For this, the Hargreaves empiric parameters, HC (empirical Hargreaves coefficient) and HE (empirical Hargreaves exponent), were adjusted considering two procedures, local adjustment (HGL -Hargreaves local adjustment) and regional adjustment (HGR -Hargreaves regional adjustment). For HGL, the adjustment of empiric parameters was done for each weather station. For HGR, the adjustment of empiric parameters was done considering the data set of all weather stations. The Hargreaves equation adjusted by both processes, local and regional, showed values of 17.95 and 21.93% for ERQM respectively, considering the full range of climatic data. The Hargreaves equation adjusted by both processes is an option to estimate the daily values of ETo in Goiás State where there are available data limitation.

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“…temperature at 2m height() (Walter et al, 2000;Lage et al, 2003;Trajkovic, 2005). 3.2 과거 건조지수 변화비교 과거 50년간(1961～2010)의 월 및 연별 건조지수 통계 분석을 실시하였다 (Fig.…”

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Climate Aridity/humidity Characteristics in Seoul According to Changes in Temperature and Precipitation Based on RCP 4.5 and 8.5

Rim¹,

Kim²

2014

Journal of Korea Water Resources Association

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In this study, monthly and annual aridity indices which are the ratios of precipitation to potential evapotranspiration in Seoul climate measurement station were analyzed for past 50 years (1961～2010), and the ratio of aridity index simulated by climate change scenarios (RCP 4.5 and 8.5) for each future period (2011～2040, 2041～2070, 2071～2100) to aridity index for the past period (1971～2000) was analyzed. Furthermore, 5 different potential evapotranspiration equations (FAO P-M, Penman, Makkink, PriestleyTaylor, Hargreaves) were applied to analyze the effect of potential evapotranspiration equation on estimating aridity index and aridity index variation ratio (%). The study results indicate that the monthly precipitation, average temperature and potential evapotranspiration were increased in each future period as compared to past period for both RCP 4.5 and RCP 8.5. Furthermore, winter period showed more significant increase of potential evapotranspiration than summer period, but aridity index showed different patterns as compared with potential evapotranspiration reflecting the influence of precipitation. Therefore, it is necessary to make preparation for the increment of winter evapotranspiration in terms of water resources management. The monthly and annual aridity indices based on future climate change scenarios were greatly different according to potential evapotranspiration equations; however, monthly and annual patterns of aridity index variation ratio (%) in the future period as compared to past period were very similar regardless of applied potential evapotranspiration equation.

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Temperature-Based Approaches for Estimating Reference Evapotranspiration

Cited by 228 publications

References 33 publications

Height increment of hybrid aspen <i>Populus tremuloides</i> x <i>P. tremula</i> as a function of weather conditions in central part of Latvia

Height increment of hybrid aspen <i>Populus tremuloides</i> x <i>P. tremula</i> as a function of weather conditions in central part of Latvia

Calibração regional e local da equação de Hargreaves para estimativa da evapotranspiração de referência

Climate Aridity/humidity Characteristics in Seoul According to Changes in Temperature and Precipitation Based on RCP 4.5 and 8.5

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