Trend Analysis of Long-Term Reference Evapotranspiration and Its Components over the Korean Peninsula

Ghafouri‐Azar, Mona; Bae, Deg‐Hyo; Kang, Shin-Uk

doi:10.3390/w10101373

Cited by 21 publications

(15 citation statements)

References 37 publications

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“…Both non-parametric (Mann-Kendall test) [32,33] and parametric (linear regression analysis) procedures are used to identify the annual and seasonal trends. The Mann-Kendall (MK) statistical test is used worldwide to detect the trend of precipitation, temperature, and relative humidity [14,[34][35][36][37]. The non-parametric tests are preferred as they are more suitable for non-normally distributed data, which are frequently encountered in hydro-meteorological time series [38].…”

Section: Trends Of Hydrological Variablesmentioning

confidence: 99%

Projected Changes in Hydrological Variables in the Agricultural Region of Alberta, Canada

Masud

Ferdous

Faramarzi

2018

Water

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The responses of regional hydrological variables to climate change are of prime concern for agricultural water resources planning and management. Therefore, the seasonal (April–September) and annual (January–December) evolution of precipitation, temperature, evapotranspiration (ET), soil moisture (SM), deep aquifer recharge (DA), and water yield (WYLD) was investigated using established statistical techniques for the historical, near and far future (1983–2007: His, 2010–2034: NF, 2040–2064: FF) in the agricultural region of Alberta, Canada. Previously calibrated and validated agro-hydrological models (Soil and Water Assessment Tool) were used to generate these variables. Future changes were investigated under two representative concentration pathways, i.e., RCP 2.6 and RCP 8.5, projected by nine global climate models (GCM). Results revealed that Alberta had become warmer and drier during the His period. The future projection showed an increase in precipitation, SM, DA, and WYLD, in turn, indicated more water resources. Precipitation and temperature were projected to increase between 1 to 7% and 1.21 to 2.32 °C, respectively. Seasonal precipitation showed a higher trend magnitude than that of annual precipitation. The temperature generally had an increasing trend in the future with a maximum in the southern Alberta. Monthly average ET was likely to increase and decrease in the rising and falling limbs of the bell-shaped curve with the peak in July. A comparison of water demand from two land use types (dominant land use and barley) during the His period showed that water deficit existed in July and August. The results of this study could help in understanding anticipated changes in hydrological variables and decision-making regarding the regional agricultural water resources management.

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Section: Trends Of Hydrological Variablesmentioning

confidence: 99%

Projected Changes in Hydrological Variables in the Agricultural Region of Alberta, Canada

Masud

Ferdous

Faramarzi

2018

Water

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“…Wind flows likely exchange the moist air very quickly with dry air, notably during spring and winter in our study area ( Figure 2), and makes ET 0 more sensitive to u z during these periods in comparison with other seasons (Ghafouri-Azar et al, 2018) (Figure 3). In general, for both sites, the sensitivity of ET 0 to climatic variables was more significant during October and May.…”

Section: Et 0 Affected Most By T Max and N During Warm Period And Rh mentioning

confidence: 93%

“…where h is the height of the measurement above the ground surface (m) and u z is the measured wind (m s -1 ). Also for standardization, T for 24-hour periods is defined as the mean of the daily maximum (T max ) and minimum temperatures (T min ) rather than as the average of hourly temperature measurements (FAO, 1998).…”

Section: Reference Evapotranspirationmentioning

confidence: 99%

“…Among different methods which have been developed to estimate ET 0 , the Penman-Monteith model simplified by The Food and Agriculture Organization of the United Nations (FAO) Paper No. 56 (henceforward called FAO56-PM) is generally accepted to have high performance in terms of predicting ET 0 (FAO, 1998). This model has been commonly used globally due to its advantage in taking into account both thermodynamic and aerodynamic characteristics (Er-Raki et al, 2007Jabloun and Sahli, 2008;Temesgen et al, 2005;Wright et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity of potential evapotranspiration to climate factors in forested mountainous watersheds

Ghiami-Shomami

Kawasaki

Léonardo

et al. 2019

Hydrological Research Letters

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Estimation of reference evapotranspiration (ET 0 ) is important in hydrological studies. As climate change is predicted to cause changes in water resources and agriculture sectors, the possible implications of changes in different climate variables on ET 0 need to be understood. Sensitivity analysis was employed to illustrate the effects of perturbation in meteorological parameters (maximum and minimum air temperature (T max and T min ), sunshine hours (n), maximum and minimum relative humidity (RH max and RH min )) and wind speed (u z ) on ET 0 . ET 0 was calculated by The Food and Agriculture Organization of the United Nations (FAO) 56 Penman-Monteith approach using climate data from 1979-2017 for the Enbara and Futatsumori watersheds in forested mountain areas in Japan. We quantified the contributions of climatic factors to ET 0 at daily, monthly, seasonal and annual time scales. Daily results showed large fluctuations. According to the monthly and seasonal analysis, during warm seasons, T max and n had more influence on ET 0 , especially in May, while for the cold seasons, RH effect was dominant, especially in December. Based on the annual results, the factors most influencing ET 0 were T max followed by n, u z , RH and T min . We also found that the response of ET 0 to changes in climatic parameters differs for sites with different topographic and geographic characteristics.

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“…Studies reported both increasing and decreasing trends in Iran (Dinpashoh et al 2011), China (Mo et al 2017;Liu et al 2020), and India (Sonali & Nagesh Kumar 2016). Significant increasing trends of ET 0 were reported in the Korean Peninsula (Ghafouri-Azar et al 2018), in Iran (Azizzadeh & Javan 2015), in central Europe (Zaninović& Gajic-Čapka 2000), and China (Niu et al 2019). The strong decreasing trend in ET 0 was observed in Canada (Burn & Hesch 2007), in the United States (Golubev et al 2001), in Australia (Donohue et al 2010), in India (Verma et al 2008;Jhajharia et al 2012;Yadav et al 2016;Goroshi et al 2017), and in China (Niu et al 2019).…”

Section: Introductionmentioning

confidence: 98%

Effect of de-trending climatic parameters on temporal changes of reference evapotranspiration in the eastern Himalayan region of Sikkim, India

Pandey

Taloh

Pandey

2021

Journal of Water and Climate Change

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Reference Evapotranspiration (ET0) is an essential factor in irrigation scheduling, climate change studies, and drought assessment. The study's main objective was to identify the influences of detrending input climatic parameters (CPs) on ET0 using linear and nonlinear approaches throughout 1980–2015 in Gangtok, East Sikkim, India. The benchmark values of ET0 were calculated using the global standard FAO56 Penman–Montieth equation. The ET0-related CPs included for the analysis are maximum temperature (Tmax), minimum temperature (Tmin), maximum relative humidity (RHmax), minimum relative humidity (RHmin), and sunshine duration (SSH). The linear and nonlinear trends in various CPs affect ET0 change. Linearly detrended series was obtained by linear regression method whereas, nonlinearly detrended series was obtained using Complete Ensemble Empirical Mode Decomposition with Adaptive Noise method. Twenty-three scenarios, including the original scenario, 11 scenarios in Group1 (CPs de-trended linearly), and 11 scenarios in Group2 (CPs de-trended nonlinearly) were generated. Influences of Tmax and SSH were more substantial than the influences of other CPs for both Group1 and Group2. This results in the SSH masked the weak influences of other CPs. The effects of the trends in CPs, especially of SSH and Tmax, were clearly shown. The ET0 values decreased significantly during 1980–2015; however, no significant decreasing trend was observed in the case of SSH, during the same period. The nonlinear detrending gave closer results to the benchmark values as compared to linear detrending because of non-monotone variations of the ET0 and CPs. Therefore, the results from nonlinear detrending were more plausible as compared to linear detrending. The diminishing trend of ET0 prompted an overall alleviation in dry spell, hence there would be a somewhat lower risk of water use in the study region.

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Trend Analysis of Long-Term Reference Evapotranspiration and Its Components over the Korean Peninsula

Cited by 21 publications

References 37 publications

Projected Changes in Hydrological Variables in the Agricultural Region of Alberta, Canada

Projected Changes in Hydrological Variables in the Agricultural Region of Alberta, Canada

Sensitivity of potential evapotranspiration to climate factors in forested mountainous watersheds

Effect of de-trending climatic parameters on temporal changes of reference evapotranspiration in the eastern Himalayan region of Sikkim, India

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