Interannual variability of precipitation in Sri Lanka
| 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.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.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/handle/70130/5110 | |
| 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 |