Precipitation trends in Sri Lanka since the 1870s and relationships to El Niño–southern oscillation

Malmgren, Björn A.; Hulugalla, Ranatunge; Hayashi, Yoshihiko; Mikami, Taisei

doi:10.1002/joc.921

Cited by 77 publications

(84 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Suppiah (1989Suppiah ( , 1997 examined the influence of extreme phases of the Southern Oscillation phenomenon, El Niño and La Niña on the seasonal rainfall of Sri Lanka and found strong links between rainfall anomalies and the ENSO events. A recent analysis has revealed the influence of El Niño and La Niña events on seasonal rainfall (Malmgren et al, 2003). The study found significantly greater amounts of second intermonsoon (October-November) precipitation during El Niño years at most of the climate stations, and increased Southwest monsoon precipitation (May-September) during La Niña years at a few climate stations.…”

Section: Introductionmentioning

confidence: 83%

Interannual variability of precipitation in Sri Lanka

Jayawardene¹,

Jayewardene²,

Sonnadara³

2015

J. Natn. Sci. Foundation Sri Lanka

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 83%

Interannual variability of precipitation in Sri Lanka

Jayawardene¹,

Jayewardene²,

Sonnadara³

2015

J. Natn. Sci. Foundation Sri Lanka

View full text Add to dashboard Cite

show abstract

“…Rainfall trends in Sri Lanka during the 130 years since 1870 and their relationships to El Nino-southern oscillation have also been studied [3]. In this study, the fluctuations in the precipitation associated with the four seasons have been analysed at 15 locations in Sri Lanka.…”

Section: Introductionmentioning

confidence: 99%

Changes in Rainfall in Sri Lanka during 1966 – 2015

Karunathilaka

Dabare²,

Nandalal

2017

Engineer

View full text Add to dashboard Cite

Abstract:The aim of this study was to analyse the annual and seasonal rainfall trends in Sri Lanka during the 50 year period from 1966 to 2015 using rainfall data collected at 32 rain gauging stations. The seasons considered were the two principal monsoon seasons and the two inter-monsoon seasons. Non-parametric Mann-Kendall trend test and Sen's Slope estimator method were used to examine the rainfall trends and determine their magnitudes. According to the analysis which was based on annual rainfall data, 21 of the gauging stations were showing increasing trends. The balance 11 stations were showing decreasing trends. Four of the stations, namely those at Anuradhapura, Batticaloa, Mapakadawewa and Pottuvil had significantly increasing trends. The three stations at Chilaw, Dandeniya Tank and Iranamadu Tank showed significantly decreasing trends. In general, the eastern region of the country has shown over the last half century an increasing rainfall trend and the western, northern and south western regions and the central hills of the country have shown a decreasing rainfall trend during the same period. The seasonal rainfall indicated increasing trends during the First-Inter Monsoon, Second-Inter Monsoon and Northwest Monsoon seasons at a majority of the stations. In contrast, during the Southwest Monsoon season, most of the gauging stations have shown downward rainfall trends.

show abstract

“…significant SOI-rainfall relationships for Sri Lanka were detailed for the October-November and July-August seasons (Suppiah, 1989(Suppiah, , 1996(Suppiah, , 1997Kane, 1998;Malmgren et al, 2003). In recent decades, there has been progress in predicting the evolution of the ENSO phenomena in the Pacific Ocean (Goddard et al, 2001).…”

mentioning

confidence: 99%

“…Previous detailed analyses of ENSO-rainfall relationships for Sri Lanka (Suppiah, 1989(Suppiah, , 1996(Suppiah, , 1997Fernando et al, 1995;Sumathipala and Punyadeva, 1998;Kane, 1998;Punyawardena and Cherry, 1999;Malmgren et al, 2003) were based on seasons defined by wind-directions, which do not match with the agricultural seasons. The seasons in use also ranged from 2 to 5 months, while contemporary seasonal predictions are most developed at a 3-month time scale.…”

mentioning

confidence: 99%

Predictability of Sri Lankan rainfall based on ENSO

Zubair¹,

Siriwardhana

Chandimala

et al. 2007

Intl Journal of Climatology

View full text Add to dashboard Cite

Investigating the year-round rainfall of Sri Lanka provides understanding into the South Asian monsoon system as it compliments studies on the Indian summer monsoon. The El Niño-Southern Oscillation (ENSO) is a primary mode of climate variability of this area. Here, the predictability of Sri Lanka rainfall based on ENSO is quantified based on composite analysis, correlations and contingency tables. The rainfall is modestly predictable based on ENSO

show abstract

Precipitation trends in Sri Lanka since the 1870s and relationships to El Niño–southern oscillation

Cited by 77 publications

References 20 publications

Interannual variability of precipitation in Sri Lanka

Interannual variability of precipitation in Sri Lanka

Changes in Rainfall in Sri Lanka during 1966 – 2015

Predictability of Sri Lankan rainfall based on ENSO

Contact Info

Product

Resources

About