Numerical simulation on Bay of Bengal's response to cyclones using the Princeton ocean model

Das, Yashvant; Mohanty, U. C.; Indu, J.

doi:10.1590/s1679-87592017111206502

Cited by 3 publications

(1 citation statement)

References 76 publications

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“…Within the radius of the maximum wind (RMW), the surface divergence caused by the cyclonic wind and the Ekman effect enhance upwelling and reduce the mixed layer depth (MLD). For most tropical cyclones, rightward bias causes the maximum MLD deepening and surface cooling to occur just beyond the radius of maximum wind on the right side of the track [3,9]. However, at any given time, the MLD 2 of 24 decreases as the radial distance increases from 1 RMW, where surface convergence produces downwelling [10].…”

Section: Introductionmentioning

confidence: 99%

Numerical Experiments of Temperature Mixing and Post-Storm Re-Stratification over the Louisiana Shelf during Hurricane Katrina (2005)

Allahdadi

Chaichitehrani

2022

JMSE

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Studying mixing and re-stratification during and after hurricanes have important implications for the simulation of circulation and bio-geochemical processes in oceanic and shelf waters. Numerical experiments using FVCOM on an unstructured computational mesh were implemented to study the direct effect of hurricane winds on the mixing and temperature redistribution of the stratified Louisiana shelf during Hurricane Katrina (2005), as well as the post-storm re-stratification timescale. The model was forced by Katrina’s wind stress obtained from a combination of H-Wind database and NCEP model. The climatological profiles of temperature and salinity for August (the month in which Katrina occurred) from the world ocean atlas (WOA, 2013) were used as the pre-storm conditions over the shelf. Model results for sea surface temperature (SST) and mixed layer depth (MLD) were validated versus SST data from an optimally interpolated satellite product, and the MLD was calculated from the heat budget equation of the mixed layer. Model results were used to examine the temporal and spatial responses of SST and MLD over the shelf to Katrina. Results showed that intense mixing occurred within 1–1.1 RMW (RMW is the radius of maximum wind for Katrina), with turbulent mixing as the dominant mixing force for regions far from the eye, although upwelling was an important contributor to modulating SST and MLD. During the peak of Katrina and for the shelf regions severely affected by the hurricane wind, three distinct temperature zones were formed across the water column: an upper mixed layer, a transition zone, and a lower upwelling zone. Shelf re-stratification started from 3 h to more than two weeks after the landfall, depending on the distance from the track. The mixing during Hurricane Katrina affected the seasonal summertime hypoxic zone over the Louisiana shelf and likely contributed to the water column re-oxygenation.

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Section: Introductionmentioning

confidence: 99%

Numerical Experiments of Temperature Mixing and Post-Storm Re-Stratification over the Louisiana Shelf during Hurricane Katrina (2005)

Allahdadi

Chaichitehrani

2022

JMSE

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Sea surface temperature effects on the modelled track and intensity of tropical cyclone Gonu

Alimohammadi

Malakooti

Rahbani

2021

Journal of Operational Oceanography

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Hurricane Sally (2020) Shifts the Ocean Thermal Structure across the Inner Core during Rapid Intensification over the Shelf

Dzwonkowski

Fournier

Lockridge

et al. 2022

Journal of Physical Oceanography

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Prediction of rapid intensification in tropical cyclones prior to landfall is a major societal issue. While air-sea interactions are clearly linked to storm intensity, the connections between the underlying thermal conditions over continental shelves and rapid intensification are limited. Here, an exceptional set of in-situ and satellite data are used to identify spatial heterogeneity in sea surface temperatures across the inner core of Hurricane Sally (2020), a storm that rapidly intensified over the shelf. A leftward shift in the region of maximum cooling was observed as the hurricane transited from the open gulf to the shelf. This shift was generated, in part, by the surface heat flux in conjunction with the along and across-shelf transport of heat from storm-generated coastal circulation. The spatial differences in the sea surface temperatures were large enough to potentially influence rapid intensification processes suggesting that coastal thermal features need to be accounted for to improve storm forecasting as well as to better understand how climate change will modify interactions between tropical cyclones and the coastal ocean.

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Numerical simulation on Bay of Bengal's response to cyclones using the Princeton ocean model

Cited by 3 publications

References 76 publications

Numerical Experiments of Temperature Mixing and Post-Storm Re-Stratification over the Louisiana Shelf during Hurricane Katrina (2005)

Numerical Experiments of Temperature Mixing and Post-Storm Re-Stratification over the Louisiana Shelf during Hurricane Katrina (2005)

Sea surface temperature effects on the modelled track and intensity of tropical cyclone Gonu

Hurricane Sally (2020) Shifts the Ocean Thermal Structure across the Inner Core during Rapid Intensification over the Shelf

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