Interannual variability of precipitation in Sri Lanka

Jayawardene, H.; Jayewardene, D.R.; Sonnadara, D.U.J.

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dc.contributor.author	Jayawardene, H.
dc.contributor.author	Jayewardene, D.R.
dc.contributor.author	Sonnadara, D.U.J.
dc.date.accessioned	2021-03-10T06:55:17Z
dc.date.available	2021-03-10T06:55:17Z
dc.date.issued	2015
dc.identifier.citation	Journal of the National Science Foundation of Sri Lanka, 43(1), 75–82 (2015)	en_US
dc.identifier.uri	http://doi.org/10.4038/jnsfsr.v43i1.7917
dc.identifier.uri	http://archive.cmb.ac.lk:8080/xmlui/handle/70130/5110
dc.description.abstract	Abstract: Two different spectral analysis methods, the multitaper method (MTM) and the maximum entropy method (MEM) were applied to investigate the presence of low-frequency periodicities in precipitation records of 14 climatological stations in Sri Lanka. The spectral analysis revealed statistically significant periodicities in the range of 2 – 3 year and 3 – 6 year periods in all parts of Sri Lanka irrespective of the climatic variability. The 2 – 3 year band corresponds to the Quasi-Biennial oscillation (QBO), while the 3 – 6 year band corresponds to the El-Nino/Southern oscillation (ENSO) higher and lower frequency bands. Cross spectrum analysis showed statistically significant (at 5 %) coherencies for the Indian Ocean dipole (IOD) and Southern oscillation index (SOI) in the 2 – 3 year band and the 3 – 6 year band, respectively for most of the regions. Thus, it is concluded that the IOD and SOI play important roles as modulators of precipitation in Sri Lanka
dc.language.iso	en	en_US
dc.subject	Periodicities	en_US
dc.subject	Spectral analysis	en_US
dc.subject	ENSO	en_US
dc.title	Interannual variability of precipitation in Sri Lanka	en_US
dc.type	Article	en_US