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Analysis of reference evapotranspiration (ET0) trends under climate change in Bangladesh using observed and CMIP5 data sets

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Abstract

ET0 is an important hydro-meteorological phenomenon, which is influenced by changing climate like other climatic parameters. This study investigates the present and future trends of ET0 in Bangladesh using 39 years’ historical and downscaled CMIP5 daily climatic data for the twenty-first century. Statistical Downscaling Model (SDSM) was used to downscale the climate data required to calculate ET0. Penman–Monteith formula was applied in ET0 calculation for both the historical and modelled data. To analyse ET0 trends and trend changing patterns, modified Mann–Kendall and Sequential Mann–Kendall tests were, respectively, done. Spatial variations of ET0 trends are presented by inverse distance weighting interpolation using ArcGIS 10.2.2. Results show that RCP8.5 (2061–2099) will experience the highest amount of ET0 totals in comparison to the historical and all other scenarios in the same time span of 39 years. Though significant positive trends were observed in the mid and last months of year from month-wise trend analysis of representative concentration pathways, significant negative trends were also found for some months using historical data in similar analysis. From long-term annual trend analysis, it was found that major part of the country represents decreasing trends using historical data, but increasing trends were observed for modelled data. Theil–Sen estimations of ET0 trends in the study depict a good consistency with the Mann–Kendall test results. The findings of the study would contribute in irrigation water management and planning of the country and also in furthering the climate change study using modelled data in the context of Bangladesh.

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Acknowledgements

The authors would like to express their gratitude to Chinese Government Scholarship Council (CSC) and to Nanjing University of Information Science and Technology (NUIST) for different forms of supports. The authors are also thankful to Bangladesh Meteorological Department (BMD) for providing climate data used in this study. Special thanks go to the anonymous reviewers who contributed much in improving the quality of this paper.

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Authors and Affiliations

  1. College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Mohammad Atiqur Rahman, Lou Yunsheng, Nahid Sultana & Victor Ongoma

  2. Department of Geography and Environmental Studies, University of Chittagong, Chittagong, 4331, Bangladesh

    Mohammad Atiqur Rahman & Nahid Sultana

  3. Department of Meteorology, South Eastern Kenya University, Kitui, Kenya

    Victor Ongoma

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Rahman, M.A., Yunsheng, L., Sultana, N. et al. Analysis of reference evapotranspiration (ET0) trends under climate change in Bangladesh using observed and CMIP5 data sets. Meteorol Atmos Phys 131, 639–655 (2019). https://doi.org/10.1007/s00703-018-0596-3

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