Trends and variability in northeast monsoon rainfall over Kerala

Authors

  • K. N. KRISHNAKUMAR Dept. of Agricultural Meteorology, College of Horticulture, Kerala Agricultural University, Vellanikkara, Thrissur-680 656, Kerala
  • G.S.L.H.V. PRASADA RAO Dept. of Agricultural Meteorology, College of Horticulture, Kerala Agricultural University, Vellanikkara, Thrissur-680 656, Kerala

DOI:

https://doi.org/10.54386/jam.v10i2.1190

Keywords:

Northeast monsoon, Trends, Coefficient of variation

Abstract

Monthly rainfall over Kerala state showed an increasing tendency during October and November with a decrease in December. Such trend was more evident since 1961 onwards. Overall, over Kerala State, there was an increase of 96.7 mm in northeast monsoon rainfall over a period of time, indicating an increase of 20.1 per cent against the normal rainfall of 481.5 mm and significant at 5 per cent level. Rainfall during December was highly variable and undependable, which is of great concern in plantation crop production of the State of Kerala. As a whole, 34.0 per cent (46 years out of 135) of the years recorded either excess or deficit rainfall. The monthly rainfall range as well as its variability was less during excess rainfall years when compared to that of deficit rainfall years. The study also revealed that El Nino/La Nina events had weak teleconnection with excess/deficit northeast monsoon rainfall over Kerala.

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Published

01-12-2008

How to Cite

K. N. KRISHNAKUMAR, & G.S.L.H.V. PRASADA RAO. (2008). Trends and variability in northeast monsoon rainfall over Kerala. Journal of Agrometeorology, 10(2), 123–126. https://doi.org/10.54386/jam.v10i2.1190

Issue

Vol. 10 No. 2 (2008): December

Section

Research Paper

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