Tropical cyclones in the Arabian Sea and the Bay of Bengal: comparison of environmental factors

Pathirana, Gayan; Priyadarshani, K.

doi:10.4038/jnsfsr.v50i1.10424

Cited by 4 publications

(3 citation statements)

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“…It is noted that both indices show a significant and relatively strong correlation with summer rainfall in the wet zone, where r = 0.6 for AS SST and r = 0.52 for BoB SST. In addition, these relatively strong correlations suggest that despite the impact of SST in summer, other factors (i.e., extreme weather events, Pathirana & Priyadarshani, 2022) may influence the summer rainfall variability in the wet zone on inter‐annual timescale. However, in the present study we mainly focused on the IO SST warming.…”

Section: Resultsmentioning

confidence: 99%

Strengthening of Sri Lanka summer monsoon rainfall with rapid Arabian Sea warming

Kajakokulan,

Warnasooriya,

Pathirana

2023

Intl Journal of Climatology

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Several studies have shown that rapid sea surface temperature (SST) warming in the tropical Indian Ocean (IO) significantly modulates the summer monsoon rainfall (SMR) over India. However, it remains unclear how the IO SST warming affects the SMR in Sri Lanka (SL). Therefore, based on observations and reanalysis data, this study investigates the impact of IO warming on SMR variability in the wet‐zone of SL during 2001–2020. The results revealed that the SMR (May–September) in SL's wet zone is increasing and is associated with rapid SST warming in the Arabian Sea during the summer monsoon. Although it is reported that the SMR may decrease over India due to the weakening of land‐sea thermal gradient in summer associated with IO warming, the rapid warming of the AS appears to enhance the SMR in the wet zone of SL. The warming of the AS during summer strengthened the low‐level easterlies, favouring moisture convergence and convection over SL, which enhanced the SMR of the wet zone of SL.

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Section: Resultsmentioning

confidence: 99%

Strengthening of Sri Lanka summer monsoon rainfall with rapid Arabian Sea warming

Kajakokulan,

Warnasooriya,

Pathirana

2023

Intl Journal of Climatology

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“…Though most of the rainfall anomalies tend to be negative for negative SST anomalies, the positive rainfall anomalies during negative SST anomalies hinder the potential impacts from large‐scale circulation or extreme events (Chakraborty and Singhai, 2021). For example, despite North‐western IO warming, extreme events during the primary tropical cyclone season in the Bay of Bengal can induce more rainfall over SL (Pathirana & Priyadarshani, 2022). Such factors may weaken the relationship between IO warming in SIM and OND rainfall.…”

Section: Resultsmentioning

confidence: 99%

“…Considering its importance, many studies have been conducted to understand tropical rainfall patterns (Marambe et al, 2015), variability (Jayawardene et al, 2015), and the associated governing factors (Zubair et al, 2003(Zubair et al, , 2008. Being a tropical country located in the northern Indian Ocean (IO), the weather and climate of Sri Lanka (SL) are influenced by the Asian monsoon and associated seasonally reversing winds and currents (Jinadasa et al, 2020), tropical climate modes (Zubair et al, 2003), and extreme events (Pathirana & Priyadarshani, 2022). In addition, being an agricultural country, SL is heavily dependent on the seasonal rainfall (Marambe et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Influence of Indian Ocean warming on rainfall of Sri Lanka

Kajakokulan,

Pathirana,

Dheerasinghe

et al. 2023

Intl Journal of Climatology

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Recent studies have pointed out an increased warming over the tropical Indian Ocean (IO) and how such warming could alter the convection and rainfall in the region. In this study, using observational/reanalysis datasets from 1981 to 2020, we show that the early Maha rainfall of Sri Lanka (SL) has been increasing, and it is considerably influenced by the North‐western IO sea surface temperature (SST) increase in the second inter‐monsoon (SIM). A significant warming in the North‐western IO alters the zonal SST gradient and strengthens the low‐level circulation, which induces large‐scale convergence over the western IO during SIM, contributing to the enhancement of rainfall over SL. However, despite the substantial impact of IO warming, the moderate correlation suggests the importance of examining other factors, which may influence the rainfall variability of SL.

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Impacts of low-frequency climate variability on tropical cyclone activity in the North Indian Ocean basin

Xalxo,

Mahala,

Mohanty

et al. 2023

Theor Appl Climatol

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Tropical cyclones in the Arabian Sea and the Bay of Bengal: comparison of environmental factors

Cited by 4 publications

References 0 publications

Strengthening of Sri Lanka summer monsoon rainfall with rapid Arabian Sea warming

Strengthening of Sri Lanka summer monsoon rainfall with rapid Arabian Sea warming

Influence of Indian Ocean warming on rainfall of Sri Lanka

Impacts of low-frequency climate variability on tropical cyclone activity in the North Indian Ocean basin

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