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Spatio-temporal analysis of climatic variables in the western part of Bangladesh

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Abstract

Monitoring and detecting trends of climatic variables like rainfall and temperature are essential for agricultural developments in the context of climate change. The present study has detected trends in annual and cropping seasonal rainfall and temperature data for the period of 1961–2011 using Mann–Kendall (MK) test, Spearman’s rho (SR) test and modified Mann–Kendall test that has been applied to the significant lag-1 serial correlated time series data, and slope has been estimated using Sen’s Slope estimator for twelve meteorological stations located in the western part of Bangladesh covering about 41 % of the country. Almost 71 % trends explored by MK test in annual rainfall are statistically insignificant, and SR test also complies it. The spatial distribution of rainfall trend shows insignificant positive trends in major part of the area. Significant positive trends both by MK test and by SR test at 95 % confidence levels are observed at rates of 8.56, 11.15 and 13.66 mm/year at Dinajpur, Rangpur and Khepupara stations, respectively, and the Kharif season rainfall of these stations also shows significant increasing trends except Dinajpur. On the other hand, significant decreasing trends in annual rainfall are found at Bhola (−11.67 mm/year) and Rajshahi (−5.951 mm/year) stations and decreasing trends in rainfall dominated the Pre-Kharif season over the area. But, 83.33 % of the stations show rising trends in annual mean temperature with significant positive trends (as observed by both MK test and SR test) at Rangpur, Bogra, Faridpur, Jessore and Bhola stations where the rate of changes vary from 0.013 °C/year at Faridpur to 0.08 °C/year at Bhola. Most of the trends in Rabi and Pre-Kharif seasons of mean temperatures are not statistically significant. However, all stations except Barisal show significant rising trends in temperature in Kharif season. To cope with this changing pattern of rainfall and temperature, effective adaptation strategies should be taken to keep up the agricultural production that is related to livelihood of the most people and to ensure the country’s food security.

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Acknowledgments

Funding was provided by Bundesministerium für Bildung und Forschung (Grant No. 03G0806C).

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Authors and Affiliations

  1. Institute of Bangladesh Studies, University of Rajshahi, Rajshahi, 6205, Bangladesh

    Md. Kamruzzaman

  2. Institute of Environmental Science, University of Rajshahi, Rajshahi, 6205, Bangladesh

    A. T. M. Sakiur Rahman

  3. Department of Statistics, University of Rajshahi, Rajshahi, 6205, Bangladesh

    Md. Shakil Ahmed & M. Sayedur Rahman

  4. School of Agricultural, Computational and Environmental Sciences, University of Southern Queensland, Toowoomba Campus, Toowoomba, Australia

    Md. Enamul Kabir

  5. Department of Geology and Mining, University of Rajshahi, Rajshahi, 6205, Bangladesh

    Quamrul Hasan Mazumder & Chowdhury Sarwar Jahan

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  1. Md. Kamruzzaman
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Correspondence to Md. Kamruzzaman.

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Kamruzzaman, M., Rahman, A.T.M.S., Ahmed, M.S. et al. Spatio-temporal analysis of climatic variables in the western part of Bangladesh. Environ Dev Sustain 20, 89–108 (2018). https://doi.org/10.1007/s10668-016-9872-x

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