On the magnitude and dynamics of eddy covariance system residual energy (energy balance closure error) in subsurface drip-irrigated maize field during growing and non-growing (dormant) seasons

Irmak, Suat; Payero, José O.; Kiliç, Ayşe; Odhiambo, Lameck O.; Rudnick, Daran R.; Sharma, Vivek; Billesbach, David P.

doi:10.1007/s00271-014-0443-3

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…In addition to the physiological sources of errors, instrument limitations [15] and data processing can impact flux accuracy and EB closure. Irmak et al [16] showed residual energy from EC can be affected by the growing season and frictional wind speed based on data collected over a maize (Zea mays L.) field in Nebraska. Higgins [17] showed that the variation in residual energy could be attributed to energy stored in the soil and underestimation of soil heat flux and underestimation of H and LE did not contribute to the residual energy based on data from salt flats in Utah.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Evapotranspiration from Eddy Covariance Using Large Weighing Lysimeters

et al. 2019

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Evapotranspiration (ET) is an important component in the water budget and used extensively in water resources management such as water planning and irrigation scheduling. In semi-arid regions, irrigation is used to supplement limited and erratic growing season rainfall to meet crop water demand. Although lysimetery is considered the most accurate method for crop water use measurements, high-precision weighing lysimeters are expensive to build and operate. Alternatively, other measurement systems such as eddy covariance (EC) are being used to estimate crop water use. However, due to numerous explicit and implicit assumptions in the EC method, an energy balance closure problem is widely acknowledged. In this study, three EC systems were installed in a field containing a large weighing lysimeter at heights of 2.5, 4.5, and 8.5 m. Sensible heat flux (H) and ET from each EC system were evaluated against the lysimeter. Energy balance closure ranged from 64% to 67% for the three sensor heights. Results showed that all three EC systems underestimated H and consequently overestimated ET; however, the underestimation of H was greater in magnitude than the overestimation of ET. Analysis showed accuracy of ET was greater than energy balance closure with error rates of 20%–30% for half-hourly values. Further analysis of error rates throughout the growing season showed that energy balance closure and ET accuracy were greatest early in the season and larger error was found after plants reached their maximum height. Therefore, large errors associated with increased biomass may indicate unaccounted-for energy stored in the plant canopy as one source of error. Summing the half-hourly data to a daily time-step drastically reduced error in ET to 10%–15%, indicating that EC has potential for use in agricultural water management.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Evapotranspiration from Eddy Covariance Using Large Weighing Lysimeters

et al. 2019

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“…Assim, como calculados por Hao et al (2007), o coeficiente angular (α) de 0,69 e R 2 de 0,95, Cunha et al (2013b) encontrou α de 0,83 e r 2 de 0,96, e Souza et al (2015a), obteve α igual a 0,75 e r 2 de 0,92 . Esses resultados encontrados indicam desigualdades no balanço de energia para a região de estudo, fato que foi documentado em outros artigos para diferentes superfícies (Foken, 2008, Irmak et al, 2014. O problema desequilíbrio no BE em estudos da micrometeorologia surge por conta da contribuição dos fluxos turbulentos (LE + H) serem menor que a energia disponível (Rn -G), de forma que os fluxos turbulentos são subestimados (Irmak et al, 2014).…”

Section: A) B)unclassified

“…Esses resultados encontrados indicam desigualdades no balanço de energia para a região de estudo, fato que foi documentado em outros artigos para diferentes superfícies (Foken, 2008, Irmak et al, 2014. O problema desequilíbrio no BE em estudos da micrometeorologia surge por conta da contribuição dos fluxos turbulentos (LE + H) serem menor que a energia disponível (Rn -G), de forma que os fluxos turbulentos são subestimados (Irmak et al, 2014). Existem algumas causas para isso, dentre elas estão à imprecisão nas medições, não se contabilizar o calor armazenado no solo e no dossel das plantas e a formação de turbilhões maiores, devido heterogeneidade da superfície (Foken et al, 2006;Irmak et al,.…”

Section: A) B)unclassified

Seasonal variation of energy fluxes in caatinga areas preserved and degraded in Northeast Brazil

Borges¹,

Santos²,

Silva³

et al. 2016

Revista Brasileira De Geografia Física

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A maior parte da região semiárida brasileira é composta pelo bioma Caatinga, caracterizada pelo déficit hídrico. A Caatinga é considerada um bioma bastante heterogêneo, sucetível às alterações antrópicas, porém sua dinâmica dos fluxos turbulentos entre o ecossistema e a atmosfera ainda são pouco estudadas. O objetivo principal deste trabalho foi analisar a variação anual do ciclo diário dos componentes do balanço de energia, bem como o fechamento do balanço de energia em áreas de Caatinga preservada e degradada, durante o ano de 2013 no município de Campina Grande-PB. Os fluxos turbulentos são estimados pela técnica de eddy covariance a partir de cálculos estatísticos entre a covariância da velocidade vertical do vento e a razão de mistura do gás. Observou-se o aumento do fluxo de calor latente durante o período chuvoso e diminuição para o saldo de radiação, fluxo de calor sensível e fluxo de calor no solo, e comportamento contrário para o período seco. Também, foi possível notar maior variação das componentes do balanço na área preservada que os da área degradada. A partir das componentes do balanço de energia fez-se o estudo do fechamento deste e verificou-se que o mesmo não ocorreu, devido à subestimativa dos fluxos turbulentos. Palavras-chave: fluxos turbulentos; balanço de energia; Caatinga preservada e degradada.

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“…Hence, the seasonal dynamics of ET and energy fluxes over agriculture fields is essential for the efficient agricultural water management (Santanello et al, 2013;Irmak et al, 2014). However, energy fluxes and ET varies across the crop growth period as the vegetative cover has potential to change energy partitioning due to its effect on the seasonal pattern and magnitude of radiation balance and albedo (Rodrigues et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Of which, the EC method has been widely used in terrestrial energy flux studies in order to measure continuous boundary-layer exchanges between land surface and atmosphere (Irmak et al, 2014;Imukova et al, 2016). Most of the EC measurements are used for the short-term (few weeks up to a few months) and long-term (several years up to decades) studies over forest lands and natural vegetation.…”

Section: Introductionmentioning

confidence: 99%

Seasonal dynamics of surface energy fluxes over a center-pivot irrigated cropland in Saudi Arabia

Madugundu¹,

Al‐Gaadi²,

Tola³

et al. 2017

JEB

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Aim: This study focused on the seasonal dynamics of energy fluxes over selected agro ecosystems (alfalfa and corn crops) to understand the role of energy partitioning in determining the mechanisms controlling the crop water requirement and irrigation schedules. Interpretation: There was contrasting variations in sensible heat and latent heat fluxes across seasons and corresponding to the changing climate and surface conditions of the field. In the case of silage corn, the proportions of partitioned energy to sensible heat (12.4%) and latent heat (18%) were higher than alfalfa. However, during the alfalfa post-harvest practices, the latent heat flux was always less as the available energy was partitioned as sensible heat rather than latent heat flux.

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On the magnitude and dynamics of eddy covariance system residual energy (energy balance closure error) in subsurface drip-irrigated maize field during growing and non-growing (dormant) seasons

Cited by 15 publications

References 30 publications

Evaluation of Evapotranspiration from Eddy Covariance Using Large Weighing Lysimeters

Evaluation of Evapotranspiration from Eddy Covariance Using Large Weighing Lysimeters

Seasonal variation of energy fluxes in caatinga areas preserved and degraded in Northeast Brazil

Seasonal dynamics of surface energy fluxes over a center-pivot irrigated cropland in Saudi Arabia

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