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Assessing seasonal precipitation trends in India using parametric and non-parametric statistical techniques

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Abstract

This paper provides an insight into the long-term trends of the four seasonal and annual precipitations in various climatological regions and sub-regions in India. The trends were useful to investigate whether Indian seasonal rainfall is changing in terms of magnitude or location-wise. Trends were assessed over the period of 1954–2003 using parametric ordinary least square fits and non-parametric Mann–Kendall technique. The trend significance was tested at the 95% confidence level. Apart from the trends for individual climatological regions in India and the average for the whole of India, trends were also specifically determined for the possible smaller geographical areas in order to understand how different the trends would be from the bigger spatial scales. The smaller geographical regions consist of the whole southwestern continental state of Kerala. It was shown that there are decreasing trends in the spring and monsoon rainfall and increasing trends in the autumn and winter rainfalls. These changes are not always homogeneous over various regions, even in the very short scales implying a careful regional analysis would be necessary for drawing conclusions regarding agro-ecological or other local projects requiring change in rainfall information. Furthermore, the differences between the trend magnitudes and directions from the two different methods are significantly small and fall well within the significance limit for all the cases investigated in Indian regions (except where noted).

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Authors and Affiliations

  1. Department of Engineering (GRO), University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK

    Indrani Pal

  2. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK

    Abir Al-Tabbaa

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  1. Indrani Pal
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  2. Abir Al-Tabbaa
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Correspondence to Indrani Pal.

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Pal, I., Al-Tabbaa, A. Assessing seasonal precipitation trends in India using parametric and non-parametric statistical techniques. Theor Appl Climatol 103, 1–11 (2011). https://doi.org/10.1007/s00704-010-0277-8

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