The optimal alternative for quantifying reference evapotranspiration in climatic sub-regions of Bangladesh

Salam, Roquia; Islam, Abu Reza Md. Towfiqul; Pham, Quoc Bao; Dehghani, M.; Al‐Ansari, Nadhir; Linh, Nguyễn Thị Thùy

doi:10.1038/s41598-020-77183-y

Cited by 58 publications

(23 citation statements)

References 72 publications

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“…Different studies [63][64][65] observed good results for Rs estimates using Equation (3); however, there is a lack of studies about solar radiation estimates in the Brazilian Cerrado. Other authors reported better performance of ETo calculated with estimated Rs [36][37][38]61,[66][67][68] than observed here, and ETo highly correlated with solar radiation in several different locations [25,27,69,70]. More research is needed to find a better model for estimating Rs and Rn.…”

Section: Et O Estimates With Limited Climatic Datacontrasting

confidence: 48%

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Júnior

Vourlitis

Curado

et al. 2021

Water

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The Brazilian savanna (Cerrado) has been heavily impacted by agricultural activities over the last four to five decades, and reliable estimates of reference evapotranspiration (ETo) are needed for water resource management and irrigation agriculture. The Penman–Monteith (PM) is one of the most accepted models for ETo estimation, but it requires many inputs that are not commonly available. Therefore, assessing the FAO guidelines to compute ETo when meteorological data are missing could lead to a better understanding of which variables are critically important for reliable estimates of ETo and how climatic variables are related to water requirements and atmospheric demands. In this study, ETo was computed for a grass-dominated part of the Cerrado from April 2010 to August 2019. We tested 12 different scenarios considering radiation, relative humidity, and/or wind speed as missing climatic data using guidelines given by the FAO. Our results presented that wind speed and actual vapor pressure do not affect ETo estimates as much as the other climatic variables; therefore, in the Cerrado’s conditions, wind speed and relative humidity measurements are less required than temperature and radiation data. When radiation data were missing, the computed ETo was overestimated compared to the benchmark. FAO procedures to estimate the net radiation presented good results during the wet season; however, during the dry season, their results were overestimated because the method could not estimate negative Rn. Our results indicate that radiation data have the highest impact on ETo for our study area and presumably for regions with similar climatic conditions. In addition, those FAO procedures for estimating radiation are not suitable when radiation data are missing.

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Section: Et O Estimates With Limited Climatic Datacontrasting

confidence: 48%

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Júnior

Vourlitis

Curado

et al. 2021

Water

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“…Although many researchers have investigated the changes and variabilities of Bangladesh’s climate at the regional and country levels (Islam et al 2017 , 2020 ; Salam et al 2020 ), the climate-health relationship studies in the country are very rare (Rahman et al 2019 ; Nissan et al 2020 ). The previous studies are focused mainly on HI anomaly assessment (Rajib et al 2011 ), extreme temperature variability (Rakib 2013 ), HI trends in southwest Bangladesh (Rakib 2018 ), effects of heat extreme (Burkart et al 2014 ), mortality due to high temperature (Burkart et al 2011 ), and heatwave prediction (Nissan et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Appraising the historical and projected spatiotemporal changes in the heat index in Bangladesh

Rahman

Salam

Islam

et al. 2021

Theor Appl Climatol

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Climate change-derived extreme heat phenomena are one of the major concerns across the globe, including Bangladesh. The appraisal of historical spatiotemporal changes and possible future changes in heat index (HI) is essential for developing heat stress mitigation strategies. However, the climate-health nexus studies in Bangladesh are very limited. This study was intended to appraise the historical and projected changes in HI in Bangladesh. The HI was computed from daily dry bulb temperature and relative humidity. The modified Mann-Kendal (MMK) test and linear regression were used to detect trends in HI for the observed period (1985–2015). The future change in HI was projected for the mid-century (2041–2070) for three Representative Concentration Pathway (RCP) scenarios, RCP 2.6, 4.5, and 8.5 using the Canadian Earth System Model Second Generation (CanESM2). The results revealed a monotonic rise in the HI and extreme caution conditions, especially in the humid summer season for most parts of Bangladesh for the observed period (1985–2015). Future projections revealed a continuous rise in HI in the forthcoming period (2041–2070). A higher and remarkable increase in the HI was projected in the northern, northeastern, and south-central regions. Among the three scenarios, the RCP 8.5 showed a higher projection of HI both in hot and humid summer compared to the other scenarios. Therefore, Bangladesh should take region-specific adaptation strategies to mitigate the impacts of HI. Supplementary Information The online version contains supplementary material available at 10.1007/s00704-021-03705-x.

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“…Luab et al analyzed the changing characteristics and influencing factors of evapotranspiration and demonstrated evapotranspiration trends in different seasons by using the multiple linear regression analysis method and the main factor weighted comprehensive 22 . To date, relevant studies have focused on the temporal and spatial evolution trends of evapotranspiration, the ecological elements that affect the change in evapotranspiration, and the correlations between evapotranspiration and meteorological factors 23,24 . Additionally, drought and water shortages are the main challenges to resources and ecology and climate change will have a great impact on the hydrology of a region 16 .…”

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confidence: 99%

Analysis of the variation in potential evapotranspiration and surface wet conditions in the Hancang River Basin, China

Zhang

Wang

2021

Sci Rep

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Evapotranspiration is an important component of the water cycle, and possible trends in evapotranspiration can, among others, influence water management and agricultural production. Potential evapotranspiration (ETp) is a measure of the ability of the atmosphere to remove water from the surface through the processes of evaporation and transpiration. It plays an important role in assessing regional dry–wet conditions and variations in meteorological conditions. This study analyzed the change trends of monthly ETp and surface dryness and wetness in the Hancang River Basin and, through principal component analysis and correlation analysis, explored the main meteorological factors that affected ETp and the interactions between meteorological factors; ETp values were estimated using the FAO-56 Penman–Monteith method. The results showed that there was a large gap in ETp between different months in the Hancang River Basin, with a trend of first increasing and then decreasing within a year. The highest monthly evapotranspiration was 114.119 mm (July), and the lowest was 42.761 mm (January). The maximum relative humidity index was 0.822 (August), and the minimum was -0.979 (January). The average temperature, precipitation, average relative humidity, and solar radiation are positive factors that affect ETp, while average air pressure is a negative factor that affects ETp. This study provides a reference for the wet conditions of small watersheds and for countermeasures to address climate change.

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The optimal alternative for quantifying reference evapotranspiration in climatic sub-regions of Bangladesh

Cited by 58 publications

References 72 publications

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Evaluation of FAO-56 Procedures for Estimating Reference Evapotranspiration Using Missing Climatic Data for a Brazilian Tropical Savanna

Appraising the historical and projected spatiotemporal changes in the heat index in Bangladesh

Analysis of the variation in potential evapotranspiration and surface wet conditions in the Hancang River Basin, China

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