Post-El Niño Influence on Summer Monsoon Rainfall in Sri Lanka DOI Open Access
Pathmarasa Kajakokulan, Vinay Kumar

Water, Год журнала: 2025, Номер 17(11), С. 1664 - 1664

Опубликована: Май 30, 2025

Sri Lanka typically experiences anomalously wet conditions during the summer following El Niño events, but this response varies due to complexity. This study investigates impact of post-El on Lanka’s Monsoon rainfall, contrasting summers after fast- and slow-decaying events. Results indicate that fast-decaying events lead cool while result in dry warm summers. These responses are linked sea surface temperature (SST) changes central eastern Pacific. During Niño, transition La Niña generates strong easterlies Pacific, enhancing moisture convergence, upward motion, cloud cover, resulting wetter over Lanka. enhanced precipitation Maritime Continent acts as a diabatic heating source, inducing Gill-type easterly wind anomalies tropical winds promote coupled feedbacks accelerate Niña, strengthening convergence motion Conversely, associated with cooling western North Pacific warming Indian Ocean, which promotes development anticyclone, suppressing reducing leading Changes Walker circulation further contribute these distinct rainfall patterns, highlighting its influence regional climate dynamics. findings enhance our understanding seasonal predictability Summers.

Язык: Английский

Role of the Pacific-Japan Pattern in Shaping Sri Lanka Rainfall DOI
Pathmarasa Kajakokulan

Asia-Pacific Journal of Atmospheric Sciences, Год журнала: 2025, Номер 61(1)

Опубликована: Янв. 20, 2025

Язык: Английский

Процитировано

4
Strengthening of Indian Ocean Dipole-Rainfall Relationship in Sri Lanka After the 1980s DOI
Pathmarasa Kajakokulan,

Shiromani Jayawardena,

Raju Attada

и другие.

Earth Systems and Environment, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

Язык: Английский

Процитировано

1
On the reasons and quantified prevalent ocean atmosphere roles for the intensification and genesis features of the ESCS Tauktae DOI Creative Commons

Ghulam G. Zahid,

Harikumar Rajaguru

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Март 3, 2025

Tauktae was an Extremely Severe Cyclonic Storm (ESCS) that occurred in the Arabian Sea (AS) during 14–19 May 2021. The present study investigates prevalent role of ocean/atmosphere on genesis and intensification it, causative ocean-met factors from a climatological current perspective; tries to understand reason though it close (~ 140 km) coast. In general, Genesis Potential Index (GPI) is higher off Indian west coast cyclone seasons, which, low-level absolute vorticity (ABV) mid-tropospheric relative humidity (RH) have major roles play. surface temperature (SST), RH, ABV shown rapidly increasing trend last decade comparing previous three decades. Before ESCS Tauktae, SST > 31 °C, tropical heat potential 130 kJ cm−2, there were upper ocean content reduced vertical wind shear observed. Higher value GPI (> 70) played significant Tauktae. Ocean 47%, while atmosphere 53% for combination La-Nina Negative-IOD (Indian Dipole) shows over eastern Sea. Also, notable MJO (Madden–Julian Oscillation) phase substantial activity (amplitude 1) are seen throughout North (NIO)

Язык: Английский

Процитировано

0
Post-El Niño Influence on Summer Monsoon Rainfall in Sri Lanka DOI Open Access
Pathmarasa Kajakokulan, Vinay Kumar

Water, Год журнала: 2025, Номер 17(11), С. 1664 - 1664

Опубликована: Май 30, 2025

Sri Lanka typically experiences anomalously wet conditions during the summer following El Niño events, but this response varies due to complexity. This study investigates impact of post-El on Lanka’s Monsoon rainfall, contrasting summers after fast- and slow-decaying events. Results indicate that fast-decaying events lead cool while result in dry warm summers. These responses are linked sea surface temperature (SST) changes central eastern Pacific. During Niño, transition La Niña generates strong easterlies Pacific, enhancing moisture convergence, upward motion, cloud cover, resulting wetter over Lanka. enhanced precipitation Maritime Continent acts as a diabatic heating source, inducing Gill-type easterly wind anomalies tropical winds promote coupled feedbacks accelerate Niña, strengthening convergence motion Conversely, associated with cooling western North Pacific warming Indian Ocean, which promotes development anticyclone, suppressing reducing leading Changes Walker circulation further contribute these distinct rainfall patterns, highlighting its influence regional climate dynamics. findings enhance our understanding seasonal predictability Summers.

Язык: Английский

Процитировано

0