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Trend and spatial distribution of rainfall & rainy days over Andaman & Nicobar Islands

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  • Naresh Kumar
  • B. Yadav
  • Ajit Tyagi
  • A. Jaswal

Abstract

The present study examines the characteristics and climatological features of daily rainfall data over Andaman & Nicobar Islands. Analysis of rainfall data reveals a large monthly deviation over the northern latitudes as compare to southern latitudes of Andaman & Nicobar Islands. Also, it is found that rainfall increases from north to south latitudes in all the seasons except monsoon, where a reverse pattern exists. In trend analysis, a statistically significant decreasing trend (confidence level >95 %) is observed for yearly rainfall and rainy days over the region. Analysis of daily rainfall intensity for each year shows increasing trend for frequency of rather heavy rain (35.6–64.4 mm) and significant decreasing trend for frequencies of light rain (2.5–7.5 mm), and very heavy rain (>124.5 mm) over the region. Many times, very heavy rain events are associated with cyclonic disturbances affecting Andaman & Nicobar Islands region. The analysis of cyclonic disturbances over the region reveals a stronger and more significant decreasing trend. So, one of the causes for decreasing trend in very heavy rain over Andaman & Nicobar Islands may be due to significant decreasing frequency of cyclonic disturbances affecting this region. Copyright Springer Science+Business Media B.V. 2012

Suggested Citation

  • Naresh Kumar & B. Yadav & Ajit Tyagi & A. Jaswal, 2012. "Trend and spatial distribution of rainfall & rainy days over Andaman & Nicobar Islands," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 63(2), pages 575-587, September.
    • Handle: RePEc:spr:nathaz:v:63:y:2012:i:2:p:575-587
    DOI: 10.1007/s11069-012-0173-x
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    References listed on IDEAS

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    1. M. Mohapatra & U. Mohanty, 2007. "Inter-annual variability of summer monsoon rainfall over Orissa (India) in relation to cyclonic disturbances," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 42(2), pages 301-315, August.
    2. D. Pattanaik, 2007. "Analysis of Rainfall Over Different Homogeneous Regions of India in Relation to Variability in Westward Movement Frequency of Monsoon Depressions," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 40(3), pages 635-646, March.
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    Cited by:

    1. Abdullah Al Mamoon & Ataur Rahman, 2017. "Rainfall in Qatar: Is it changing?," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(1), pages 453-470, January.
    2. Renjith VishnuRadhan & Divya David Thresyamma & Kamal Sarma & Grinson George & Prabhakar Shirodkar & Ponnumony Vethamony, 2015. "Influence of natural and anthropogenic factors on the water quality of the coastal waters around the South Andaman in the Bay of Bengal," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 78(1), pages 309-331, August.

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