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Meteorology and Atmospheric Physics

, Volume 131, Issue 4, pp 883–896 | Cite as

Statistical analysis of trends in monthly precipitation at the Limbang River Basin, Sarawak (NW Borneo), Malaysia

  • M. V. Ninu KrishnanEmail author
  • M. V. Prasanna
  • H. Vijith
Original Paper

Abstract

Effect of climate change in a region can be characterised by the analysis of rainfall trends. In the present research, monthly rainfall trends at Limbang River Basin (LRB) in Sarawak, Malaysia for a period of 45 years (1970–2015) were characterised through the non-parametric Mann–Kendall and Spearman’s Rho tests and relative seasonality index. Statistically processed monthly rainfall of 12 well distributed rain gauging stations in LRB shows almost equal amount of rainfall in all months. Mann–Kendall and Spearman’s Rho tests revealed a specific pattern of rainfall trend with a definite boundary marked in the months of January and August with positive trends in all stations. Among the stations, Limbang DID, Long Napir and Ukong showed positive (increasing) trends in all months with a maximum increase of 4.06 mm/year (p = 0.01) in November. All other stations showed varying trends (both increasing and decreasing). Significant (p = 0.05) decreasing trend was noticed in Ulu Medalam and Setuan during September (− 1.67 and − 1.79 mm/year) and October (− 1.59 and − 1.68 mm/year) in Mann–Kendall and Spearman’s Rho tests. Spatial pattern of monthly rainfall trends showed two clusters of increasing rainfalls (maximas) in upper and lower part of the river basin separated with a dominant decreasing rainfall corridor. The results indicate a generally increasing trend of rainfall in Sarawak, Borneo.

Notes

Acknowledgements

The first author gratefully acknowledges the Curtin University Malaysia for providing financial support (CSPRS) and research facility during the study and Department of Irrigation and Drainage (DID), Sarawak, Malaysia for providing rainfall data. Authors are also thankful to the anonymous reviewer for the critical review, constructive comments and suggestions, which improved the quality of manuscript significantly.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Applied Geology, Faculty of Engineering and ScienceCurtin University MalaysiaMiriMalaysia

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