El Nino - A short term signal of a long term and a large scale climate variation

Sumathipala, W. L.

doi:10.4038/jnsfsr.v42i3.7405

Cited by 5 publications

(5 citation statements)

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“…Our study revealed that all the stations experienced below average seasonal rainfall during 1982/83 ENSO event, except Annfield and Watawala stations; these stations showed above average seasonal rainfall during JJAS season in 1982. However, Sumathipala [19] further mentioned that during 1986/87 ENSO effect on Sri Lanka was minimal. 1986/87 ENSO event impacted below average seasonal rainfall for all the stations in 1987.…”

Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

“…In our study, the catchment over Kotmale is a subcatchment of Mahaweli basin and our study also shows that there is a decline of rainfall during JJAS season during the warm ENSO phases. However, since Sri Lanka is comparatively a small island, the oceanic conditions around Sri Lanka can also modify the El-Nino effects [19].…”

Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

“…On the other hand during mid-August (52nd pentad), the average pentad daily rainfall showed more rainfall compared to average pentad daily rainfall for JJAS season. Sumathipala [19] mentioned that during 1982/83 ENSO event, Sri Lanka suffered severe drought condition. Our study revealed that all the stations experienced below average seasonal rainfall during 1982/83 ENSO event, except Annfield and Watawala stations; these stations showed above average seasonal rainfall during JJAS season in 1982.…”

Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

“…According to the location of Walker cell from April to September, Sri Lanka receives relatively lower rainfall during El Nino and subsequently receives increased rainfall during October to December [9,17,18]. Since Sri Lanka is a tiny island in the vast Indian Ocean, the oceanic condition around Sri Lanka also modifies the El-Nino effect [19].…”

Section: Introductionmentioning

confidence: 99%

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Monitoring Water Resources over the Kotmale Reservoir in Sri Lanka Using ENSO Phases

Chandrasekara

Venkatraman

Kwon

2017

Advances in Meteorology

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In this study, the El Nino Southern Oscillation (ENSO) phase index is used for water management over the Kotmale reservoir in Sri Lanka. Daily rainfall data of 9 stations over the Kotmale catchment during 1960-2005 June-September (JJAS) season is investigated over the Kotmale catchment. The ENSO phases are identified based on the 0.5 ∘ C sea surface temperature (SST) anomaly over Nino 3 region. The study has brought out few stations showing increasing and a few decreasing seasonal rainfall trends for JJAS season, while there is no change in the annual rainfall for the catchment. Monthly and seasonal rainfall of all the selected stations showed negative correlation with the sea surface temperature (SST) over the Nino-3 region index during JJAS season with varying magnitudes. During the warm phase of ENSO, below average rainfall is prominent for JJAS season over many stations. The rainfall especially during early September showed a significant below average rainfall during the warm ENSO phase. The seasonal rainfall during neutral and cold ENSO phases does not experience similar significant changes as seen during warm ENSO phase. Inflow of the Kotmale reservoir shows decreasing trend for the period of 1960-2005 in the observation from all stations collectively.

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Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

Section: Rainfall Characteristics Over Helboda-north Station (Charactmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring Water Resources over the Kotmale Reservoir in Sri Lanka Using ENSO Phases

Chandrasekara

Venkatraman

Kwon

2017

Advances in Meteorology

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“…The cold ENSO phase is identified based on the threshold level of -0.5 0 C SST anomaly, but we found years of higher cooling ENSO phases where SST anomaly is more than In addition to ENSO, there are other phenomena which could influence seasonal rainfall over Sri Lanka. Since, Sri Lanka is comparatively a small Island, ocean conditions around the country can modify the El-Nino effect [37]. Indian Ocean sea surface temperature is the important factor influencing the circulation or rainfall over Indian Ocean rim countries.…”

Section: Enso Impact On the Seasonal Rainfallmentioning

confidence: 99%

Teleconnection between Cold ENSO Phases and Seasonal Rainfall Over Sri Lanka: Case Study in Kotmale Catchment

Chandrasekara¹,

Chandrasekara

Venkatraman

et al. 2018

Engineer

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Cold ENSO phase or La-Nina is the least considered atmospheric oscillation in the hydro-meteorological sector in Sri Lanka. Therefore, this study focused on understanding teleconnection between cold ENSO phases and the seasonal rainfall over Kotmale catchment. Daily rainfall data of 9meteorological stations were used to investigate behaviour of annual rainfall climatologies of the catchment. Daily mean inflow data of Kotmale reservoir for the duration of 1984-2012 was analysed to understand the trends of the reservoir inflow. Sea surface temperature values were extracted from the Japan Meteorological Agency to determine cold ENSO phase. Rainfall trend for each station and inflow trend of the reservoir both declined throughout the selected time duration. However the rate of decreasing trend changes with each station. Seasonal rainfall of all the stations showed negative correlation with mean sea surface temperature over Nino 3 region for December to September. Cold ENSO phases encounter prominent above-average seasonal rainfall during and the onset of SouthWest monsoon. Further, onset and during of NorthEast monsoon rainfall over the catchment was weakened due to the impact of cold ENSO phase over Nino 3 region. However, further studies are suggested to identify hidden opposite phenomenon observed during cold ENSO phases on 1964 and 1967 in Kotmale catchment, where all the stations experienced worst below-average seasonal rainfall.

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South Asian perspective on temperature and rainfall extremes: A review

Naveendrakumar

Vithanage

Kwon

et al. 2019

Atmospheric Research

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El Nino - A short term signal of a long term and a large scale climate variation

Cited by 5 publications

References 0 publications

Monitoring Water Resources over the Kotmale Reservoir in Sri Lanka Using ENSO Phases

Monitoring Water Resources over the Kotmale Reservoir in Sri Lanka Using ENSO Phases

Teleconnection between Cold ENSO Phases and Seasonal Rainfall Over Sri Lanka: Case Study in Kotmale Catchment

South Asian perspective on temperature and rainfall extremes: A review

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