Upper Ocean and Subsurface Variability in the Bay of Bengal During Cyclone ROANU: A Synergistic View Using In Situ and Satellite Observations

Mandal, Samiran; Sil, Sourav; Shee, Abhijit; Venkatesan, R.

doi:10.1007/s00024-018-1932-8

Cited by 32 publications

(15 citation statements)

References 32 publications

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“…The Brunt-Vaisala frequency of ocean eddies decreased slightly after Roanu, meaning that the TS promoted the vertical mixing of seawater and deepened mixed layer. As the BOB upper ocean was stratified significantly under the influence of rivers and precipitation, the low-salinity seawater in the surface layer was located above the deep warm seawater [ 46 , 47 ], TS edge strongly negative wind stress curl anomaly ( Fig 3D–3F ), leading to the upper seawater convergent sinking, mixed layer thickness increased, intensifying northeastern sections of warm eddies W1 and W2 and slightly deepening the mixed layers of cold eddies C1 and C2. In addition, because the mixed layers of the warm eddies were very deep [ 22 , 23 ], cooling water in the thermocline could not entrain into the mixed layer, decreasing sea surface cooling due to the TS and providing more latent heat flux for the TS ( Fig 4A–4C ).…”

Section: Discussionmentioning

confidence: 99%

“…Both sections show that the latent heat flux during Roanu was larger than that during non- Roanu, TCHP was smaller than that during non-Roanu, and MLD began to deepen continuously from May 16. Mandal et al and Roy Chowdhury et al [ 47 , 48 ] also mentioned that heat loss and wind speed increase would cause strong air-sea flux near the ocean surface. Because C2 and W2 on section K2 were small, weak and far from the TS track, the phenomenon reflected by section K2 was not as obvious as that in section K1, but the continuous strengthening process of W2 can be clearly seen ( Fig 6E and 6F ).…”

Section: Discussionmentioning

confidence: 99%

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Effects of ocean eddies on the tropical storm Roanu intensity in the Bay of Bengal

Liu¹,

Lü²,

Zhang³

et al. 2021

PLoS ONE

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A tropical storm (TS) Roanu occurred in northern Sri Lanka in 2016, which transported northwards along the west coast of the Bay of Bengal (BoB). During the development of the TS, ocean eddies on its track had an important effect on the intensity of Roanu. The dynamic mechanism was investigated with multisource reanalysis and Argo float data in this study. The results show that ocean eddies were the main reason why Roanu first enhanced, weakened, and then enhanced again. Warm eddy W1 supports the initial development of the TS, cold eddy C1 weakens Roanu, and warm eddy W2 continues to support Roanu. On May 19, 2016, the maximum average latent heat flux over W1 was 260.85 w/m2, while that of C1 was only 200.71 w/m2. After the passage of Roanu, the tropical cyclone heat potential (TCHP) of eddies significantly decreased. The TCHP of W1, W2, C1 and C2 decreased by 20.95 kJ/cm2, 11.07 kJ/cm2, 29.82 kJ/cm2, 9.31 kJ/cm2, respectively. The mixed layer of warm eddies deepened much more than that of cold eddies, supporting Roanu development. In addition, changes in potential vorticity (PV) values caused by the disturbance of eddies may also reflect changes in the TS intensity. This study offers new insights on the influence of ocean eddies in regulating the development of tropical cyclone (TC) in the BoB.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Effects of ocean eddies on the tropical storm Roanu intensity in the Bay of Bengal

Liu¹,

Lü²,

Zhang³

et al. 2021

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…This shows that the relationship between the SSTs and the cyclone intensity is not linear. Also, the recovery time of the SSTs to the pre-cyclone value is not consistent, and varies from six days to one month depending on the magnitude of the SST cooling (Mandal et al 2018).…”

Section: Ocean Cooling and The Role Of Barrier Layer Mixed Layer And ...mentioning

confidence: 97%

A review of ocean-atmosphere interactions during tropical cyclones in the north Indian Ocean

Singh

Roxy

2022

Earth-Science Reviews

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“…It intensified into a cyclonic storm (CS) over west central Bay of Bengal and lay centered near latitude 15.10N and longitude 81.40E with maximum sustained winds of 35 knots around the system center at 0000 UTC of 19 th . On 19 th May, BMD and IMD reported that the system had reached to cyclonic storm intensity assigning the name 'Roanu' (Mandal et al, 2018). The system maintained its intensity of 45 knots and crossed Bangladesh coast near latitude 22.60N and longitud91.60E, to the north of Chittagong around 1000 UTC of 21 st May as a CS.…”

Section: Description Of the Selected Cyclone Case Roanumentioning

confidence: 99%

Simulation of Intensity, Track and Landfall of Tropical Cyclonic Storm Roanu over the Bay of Bengal Using WRF-ARW Model

Alam¹,

Ahmed²,

Rahman³

et al. 2021

Dhaka Univ J Earth Env Sci

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Almost every year, tropical cyclone forms over the Bay of Bengal in pre-monsoon and post-monsoon which strikes Bangladesh coast and the east coast of India. As the full thermodynamic features of a cyclone is not solved yet, an attempt has been made to simulate the track and landfall of cyclonic disturbances over the Bay of Bengal by using Weather Research and Forecasting (WRF) model. The WRF model (version 3.8) was run in a single domain of 20 km horizontal resolution. The model was run using WRF Single-Moment 3- class microphysics scheme, Kain- Fritsch (new Eta) cumulus physics scheme, Yonsei University planetary boundary layer scheme, revised MM5 surface layer physics scheme, Rapid Radiative Transfer Model (RRTM) for long-wave and Dudhia scheme for short-wave scheme. The model was run for 24-h, 48-h, 72-h and 96-h using the National Centre for Environmental Prediction (NCEP) high-resolution Global Final (FNL) Analysis 6-hourly data using initial and lateral boundary conditions. The model simulated landfall position errors are found 53 km, 129 km, 119km and 23 km and time errors are found 02 E, 06 D, 02 E and 00 for 96-h, 72-h, 48-h and 24-h model run respectively (E indicates Earlier and D indicates Delay). The minimum time and position error is found in 24-hrs simulation. The spatial distribution is captured by the model is almost appropriate but the computational station rainfall is found less than that of observed rainfall. The Dhaka University Journal of Earth and Environmental Sciences, Vol. 10(1), 2021, P 33-45

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Upper Ocean and Subsurface Variability in the Bay of Bengal During Cyclone ROANU: A Synergistic View Using In Situ and Satellite Observations

Cited by 32 publications

References 32 publications

Effects of ocean eddies on the tropical storm Roanu intensity in the Bay of Bengal

Effects of ocean eddies on the tropical storm Roanu intensity in the Bay of Bengal

A review of ocean-atmosphere interactions during tropical cyclones in the north Indian Ocean

Simulation of Intensity, Track and Landfall of Tropical Cyclonic Storm Roanu over the Bay of Bengal Using WRF-ARW Model

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