Energy balance closure and its effects on evapotranspiration measurements with the eddy covariance technique in a cropland

Du, 刘渡 Liu; Jun, 黎军 Li; Qiang, 于强 Yu; Xiaojuan, 同小娟 Tong; Zhu, 欧阳竹 Ouyang

doi:10.5846/stxb201201220123

Acta Eco Sin

2012

DOI: 10.5846/stxb201201220123

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Energy balance closure and its effects on evapotranspiration measurements with the eddy covariance technique in a cropland

刘渡 Liu Du¹,

黎军 Li Jun²,

于强 Yu Qiang³

et al.

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Cited by 2 publications

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“…The domestic and foreign scholars do lots of researches and practice on the plant transpiration water consumption measurement methods and means, mainly including: micrometeorological method, the water balance method, the method of plant physiology. Vorticity related method [3] and bowen ratio method [4] of micrometeorology method are the most widely used, their advantages are directly calculated water heat flux, get community average vertical water vapor flux. Weighing lysimeter [5] is the most applied method of the water balance method, its advantages are the original soil of weighing, and can accurately measure the soil evapotranspiration water consumption, it is suitable for long-term positioning monitoring.…”

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The Study of Native Plants Water Consumption Characteristic in Gurbantunggut Desert

Yang

et al. 2013

AMM

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The plants' sap flow can characterize water transpiration and consumption, reflect water transmission situation and then determine the vegetation ecological water requirement. This paper takes Haloxylon ammodendron and Tamarix as the research object, adopts thermal diffusion method[1], studies vegetation trunk fluid flow characteristics and the relationship between the meteorological factors. The results show that: (1) Haloxylon ammodendron and Tamarix's sap flux density are showed obvious diurnal variation rule, there is a "nap" phenomenon. Haloxylon ammodendron's liquid sap flux density of monthly mean performance is July > June >August, and Tamarix is July > August >June. (2) Haloxylon ammodendron's flow start time in cloudy is delayed about 1 ~ 1.5 h or so than in sunny day, and Tamarix is about 0.5 h delay. (3) Haloxylon ammodendron and Tamarix's fluid sap flux density in each month are significantly related to meteorological factors, through the regression analysis, Haloxylon ammodendron and Tamarix's trunk liquid sap flux density can make a regression model with meteorological factors.

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confidence: 99%

The Study of Native Plants Water Consumption Characteristic in Gurbantunggut Desert

Yang

et al. 2013

AMM

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Estimating daily evapotranspiration based on a model of evaporative fraction (EF) for mixed pixels

Xin

Peng

et al. 2019

Hydrol. Earth Syst. Sci.

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Abstract. Currently, applications of remote sensing evapotranspiration (ET) products are limited by the coarse resolution of satellite remote sensing data caused by land surface heterogeneities and the temporal-scale extrapolation of the instantaneous latent heat flux (LE) based on satellite overpass time. This study proposes a simple but efficient model (EFAF) for estimating the daily ET of remotely sensed mixed pixels using a model of the evaporative fraction (EF) and area fraction (AF) to increase the accuracy of ET estimate over heterogeneous land surfaces. To accomplish this goal, we derive an equation for calculating the EF of mixed pixels based on two key hypotheses. Hypothesis 1 states that the available energy (AE) of each sub-pixel is approximately equal to that of any other sub-pixels in the same mixed pixel within an acceptable margin of error and is equivalent to the AE of the mixed pixel. This approach simplifies the equation, and uncertainties and errors related to the estimated ET values are minor. Hypothesis 2 states that the EF of each sub-pixel is equal to that of the nearest pure pixel(s) of the same land cover type. This equation is designed to correct spatial-scale errors for the EF of mixed pixels; it can be used to calculate daily ET from daily AE data. The model was applied to an artificial oasis located in the midstream area of the Heihe River using HJ-1B satellite data with a 300 m resolution. The results generated before and after making corrections were compared and validated using site data from eddy covariance systems. The results show that the new model can significantly improve the accuracy of daily ET estimates relative to the lumped method; the coefficient of determination (R2) increased to 0.82 from 0.62, the root mean square error (RMSE) decreased to 1.60 from 2.47 MJ m−2(decreased approximately to 0.64 from 0.99 mm) and the mean bias error (MBE) decreased from 1.92 to 1.18 MJ m−2 (decreased from approximately 0.77 to 0.47 mm). It is concluded that EFAF can reproduce daily ET with reasonable accuracy; can be used to produce the ET product; and can be applied to hydrology research, precision agricultural management and monitoring natural ecosystems in the future.

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Energy balance closure and its effects on evapotranspiration measurements with the eddy covariance technique in a cropland

Cited by 2 publications

References 10 publications

The Study of Native Plants Water Consumption Characteristic in Gurbantunggut Desert

The Study of Native Plants Water Consumption Characteristic in Gurbantunggut Desert

Estimating daily evapotranspiration based on a model of evaporative fraction (EF) for mixed pixels

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