Recent changes in reference evapotranspiration in Romania

Croitoru, Adina‐Eliza; Piticar, Adrian; Dragotă, Carmen-Sofia; Burada, Doina Cristina

doi:10.1016/j.gloplacha.2013.09.004

Cited by 91 publications

(51 citation statements)

References 40 publications

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“…The same declining trends were also found in other regions throughout the world, such as New Zealand (from the 1970s to the early 2000s), India , and parts of China [12][13][14]. However, an increasing trend in ET 0 was identified in other regions from the 1960s to early 2000s, such as Iran , Northern Eurasia , and parts of Romania (1961Romania ( -2007 [3,15,16].…”

Section: Introductionsupporting

confidence: 65%

“…Contrary to the general expectation that an increase in temperature leads to an increase in evapotranspiration, such as in south and southeast Romanian during 1961-2007 and in the semi-arid and humid regions in Iran during [3,9], some previous studies conclude that evaporation has diminished in the last few decades. In the upper and middle to lower Yangtze River basin, Wang et al [10] reported a decreasing trend in ET 0 from 1961-2000 based on daily data from 115 meteorological stations.…”

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

“…The change has been identified not only in individual parameters, such as temperature or precipitation, but also in integrated parameters, like reference evapotranspiration (ET 0 ) [3]. ET 0 is one of the vital components of the hydrological cycle and controls the energy and mass exchange between terrestrial ecosystems and the atmosphere [3,4]. It is influenced by many factors including climate factors (e.g., temperature, solar radiation), crop factors (e.g., crop pattern, cropping system), environmental conditions, and water resource management [5].…”

Section: Introductionmentioning

confidence: 99%

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Changes of Reference Evapotranspiration and Its Relationship to Dry/Wet Conditions Based on the Aridity Index in the Songnen Grassland, Northeast China

Zhang

Sun

et al. 2017

Water

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Abstract:Reference evapotranspiration (ET 0 ) plays an important role in regional dry/wet conditions. Based on the Food and Agriculture Organization of the United (FAO) Penman-Monteith method and daily climate variables, ET 0 was calculated for 21 stations in and around the Songnen Grassland, northeast China, during 1960China, during -2014. The temporal and spatial variations of ET 0 and precipitation (P) were analyzed in the annual, seasonal, and growing season (from April to October) time series using the Mann-Kendall test, Sen's slope estimator, and linear regression coupled with a break trend analysis. A sensitivity analysis was used to detect the key climate parameter contributing to ET 0 change. By linear regression analysis on the relationship between ET 0 , P, and the aridity index (AI), the role of ET 0 in determining regional wet/dry conditions was analyzed. Results show a higher ET 0 in the southwest and a lower ET 0 in the northeast, but P was opposite to that of ET 0 . Evident decreasing trends of ET 0 in the annual, seasonal, and growing season time series were detected in almost the entire region by the trend analysis methods. For the entire region, the decreasing trend of ET 0 can be linked to the relative humidity and maximum air temperature. The positive contribution of increasing temperature to ET 0 was offset by the effect of the significantly decreasing relative humidity, wind speed, and sunshine duration at the 0.05 level during 1960-2014. In addition, the value of ET 0 was higher in drought years and lower in wet years.

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Section: Introductionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Changes of Reference Evapotranspiration and Its Relationship to Dry/Wet Conditions Based on the Aridity Index in the Songnen Grassland, Northeast China

Zhang

Sun

et al. 2017

Water

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“…It is especially applied to estimate crop water requirements and support irrigation scheduling and drought management (Raziei and Pereira, 2013). Evapotranspiration has also often been used to identify regions prone to drought, and it is an important field of research related to climate changes (Croitoru et al, 2013). Crop evapotranspiration quantification must frequently be preceded by the determination of reference evapotranspiration (ET 0 ), which has been defined by Doorenbos and Pruitt (1977) as the rate of evapotranspiration from an extensive area covered with grass that is 0.08 to 0.15 m tall, uniform, actively growing, completely shading the ground, and under adequate soil-water conditions.…”

Section: Introductionmentioning

confidence: 99%

Reference evapotranspiration estimates based on minimum meteorological variable requirements of historical weather data

Neto¹,

Júnior²,

Andrade

et al. 2015

Chilean J. Agric. Res.

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Reference evapotranspiration (ET 0 ) is critical for agricultural and urban planning, irrigation scheduling, regional water balance studies, and agroclimatological zoning. The objective of this study was to estimate ET 0 based on methods with minimum meteorological variable requirements and on empirical models to predict solar radiation. These alternative methods were compared to the FAO Penman-Monteith method by using more than 80 yr of historical weather data. Alternative methods were adapted from the standard FAO Penman-Monteith or Priestley-Taylor methods, which allow estimating ET 0 when fewer meteorological variables are available. The Hargreaves-Samani method was also analyzed. The mean absolute error, index of agreement, correlation coefficient, and confidence index were used to compare the alternative methods. Results showed that alternative methods based on the maximum and minimum temperatures, sunshine hours, and/ or wind speed are appropriate for estimating ET 0 in the region under study.

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Spatiotemporal variation and driving forces of reference evapotranspiration in Jing River Basin, northwest China

Shi

Wang

et al. 2015

Hydrological Processes

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Abstract:Evapotranspiration is an important component of the hydrological cycle, which integrates atmospheric demands and surface conditions. Research on spatial and temporal variations of reference evapotranspiration (ET o ) enables understanding of climate change and its effects on hydrological processes and water resources. In this study, ET o was estimated by the FAO-56 PenmanMonteith method in the Jing River Basin in China, based on daily data from 37 meteorological stations from 1960 to 2005. ET o trends were detected by the Mann-Kendall test in annual, seasonal, and monthly timescales. Sensitivity coefficients were used to examine the contribution of important meteorological variables to ET o . The influence of agricultural activities, especially irrigation on ET o was also analyzed. We found that ET o showed a decreasing trend in most of the basin in all seasons, except for autumn, which showed an increasing trend. Mean maximum temperature was generally the most sensitive parameter for ET o , followed by relative humidity, solar radiation, mean minimum temperature, and wind speed. Wind speed was the most dominant factor for the declining trend in ET o . The more significant decrease in ET o for agricultural and irrigation stations was mainly because of the more significant decrease in wind speed and sunshine hours, a mitigation in climate warming, and more significant increase in relative humidity compared with natural stations and non-irrigation stations. Changes in ET o and the sensitivity coefficient of meteorological variables in relation to ET o were also affected by topography. Better understanding of ET o response to climate change will enable efficient use of agricultural production and water resources, which could improve the ecological environment in Jing River Basin.

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Recent changes in reference evapotranspiration in Romania

Cited by 91 publications

References 40 publications

Changes of Reference Evapotranspiration and Its Relationship to Dry/Wet Conditions Based on the Aridity Index in the Songnen Grassland, Northeast China

Changes of Reference Evapotranspiration and Its Relationship to Dry/Wet Conditions Based on the Aridity Index in the Songnen Grassland, Northeast China

Reference evapotranspiration estimates based on minimum meteorological variable requirements of historical weather data

Spatiotemporal variation and driving forces of reference evapotranspiration in Jing River Basin, northwest China

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