Observed tidal currents on the continental shelf off the east coast of India

Jithin, A. K.; Unnikrishnan, A.S.; Fernando, V.; Subeesh, M.P.; Fernandes, Rui; Khalap, S.; Narayan, Sumesh; Agarvadekar, Y.; Gaonkar, M G; Tari, P.; Kankonkar, A.; Vernekar, S.

doi:10.1016/j.csr.2017.04.001

Cited by 21 publications

(10 citation statements)

References 46 publications

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“…Strong internal tide activity in the northern part (18.6°N) of the continental shelf in the western BoB is observed during August to October, while the energetic internal tides are found during December and January in the southern part (12°N). Jithin, Unnikrishnan , et al () reported that these changes are associated with the seasonal changes in background stratification.…”

Section: Introductionmentioning

confidence: 98%

“…Since 2008, Acoustic Doppler Current Profilers (ADCP) were deployed at 100 and 1,000 m at several locations off the Indian coasts for a long period by CSIR‐National Institute of Oceanography. Data from ADCPs were analyzed to describe the characteristics of barotropic and internal tides off the west coast of India (Subeesh et al, ; Subeesh & Unnikrishnan, ) and off the east coast of India (Jithin, Unnikrishnan, et al, ), respectively. Jithin, Unnikrishnan, et al () analyzed these data and reported that a significant part of internal wave activity in the western BoB is confined to tidal frequencies, particularly in the semidiurnal band.…”

Section: Introductionmentioning

confidence: 99%

“…Data from ADCPs were analyzed to describe the characteristics of barotropic and internal tides off the west coast of India (Subeesh et al, ; Subeesh & Unnikrishnan, ) and off the east coast of India (Jithin, Unnikrishnan, et al, ), respectively. Jithin, Unnikrishnan, et al () analyzed these data and reported that a significant part of internal wave activity in the western BoB is confined to tidal frequencies, particularly in the semidiurnal band. Magnitude of observed baroclinic currents in the semidiurnal band on the shelf is about 8–15 cm/s with a dominant first mode vertical structure.…”

Section: Introductionmentioning

confidence: 99%

“…Internal tides are generally phase locked to barotropic tides (coherent), if they are locally generated, and harmonic analysis can be used to extract these phase‐locked signals (Mitchum & Chiswell, ; Xu et al, ; Nash, Shroyer, et al, ; Stephenson et al, ; Subeesh & Unnikrishnan, ; Buijsman et al, ). Jithin, Unnikrishnan, et al () reported that while semidiurnal internal tides in the southern and northern parts of the shelf show spring‐neap variability, they are highly intermittent and incoherent off the central parts. Moreover, they pointed out that the magnitudes of barotropic tidal currents on the shelf off the east coast of India increase from south to north (magnitude of barotropic tidal current in the northern part of the shelf is about 2 times larger than those in the southern part of the shelf), whereas the internal tides in the southern and northern parts of the shelf are more energetic compared to those in the central parts.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics

et al. 2019

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Generation and propagation of internal tides in the western Bay of Bengal (BoB) are investigated using observations from Acoustic Doppler Current Profilers and simulations from a very high resolution numerical ocean model. Observations show that semidiurnal internal tides in the southern and northern parts of the western BoB are more energetic during neap phase of the local barotropic tide than those during spring phase. Numerical simulations indicate that internal tides generated over the Andaman-Nicobar Ridge propagate westward for about 1,000-1,450 km across the BoB and finally impinge on the continental slopes off the east coast of India after 5-7 days. Energetic internal tides observed during the neap phase of the barotropic tides in the western BoB are mainly due to the arrival of remotely generated internal tides. We show that the variation in the onshore transmission of these remotely generated internal tides due to the topographic slope in the western BoB controls the strength of internal tide activity along the shelf. Superposition of reflected internal tides from continental slope, which are very steep in some regions and onshore propagating-waves generate partly standing waves. Numerical experiments suggest that internal tides coming from remote sources account for more than 80% of the total internal tide energy observed in the western BoB. Internal tide energy dissipation on the continental margins of the western BoB is about 3 to 4 times larger than the local generation, indicating that this region is a sink for remotely generated internal tide energy.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics

et al. 2019

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“…The integration of this high-resolution model was initialized on 01 June 2010 using the initial and boundary conditions extracted from a Indian Ocean Model with a horizontal resolution of 1/12 and simulation extends upto March 2016 37 . Model has taken about two and half years to become stable after the initialization and hence the simulation from 1 January 2013 has been used for this study.…”

Section: Methodsmentioning

confidence: 99%

Role of internal tide mixing in keeping the deep Andaman Sea warmer than the Bay of Bengal

Jithin

Francis

2020

Sci Rep

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amplitude of internal waves/tides could be larger in future and such increase could also result in increased internal tide induced mixing. Since the bottom temperature in the deep AS is relatively warmer than the surrounding waters and the vertical mixing is very strong, AS could have a more rapid response to the change in temperature in the global warming scenario compared to other regions. Therefore, modelling and long-term measurements of physical, chemical and biological properties will be crucial in deciphering the long-term change in this region.

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The early–middle Cambrian siliciclastic tide‐dominated succession in eastern Korea

Oh,

Choi,

Lee

2024

The Depositional Record

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The basal Taebaek Group (Myeonsan and Myobong formations) illustrates second‐order transgression on the eastern Sino‐Korean Block during the early–middle Cambrian (Stage 3?–Wuliuan). The irregular palaeotopography of Precambrian basement led to the development of localised alluvial fans and fan deltas. As transgression continued, tidally influenced estuarine and associated shallow subtidal flats developed. Continued transgression resulted in a relatively deep subtidal environment, with postulated carbonate shoals serving as barriers. Stacking of facies indicates a general deepening‐upward trend, transitioning from terrestrial–nearshore to marine environments dominated by tidal effects. The study area subsequently experienced shallowing, leading to the emergence of tidal inlet and dune environments. Siliciclastic input was attenuated, facilitating the development of carbonate shoal complexes. The overall transgressive succession of the basal Taebaek Group aligns with similar sequences observed in the Sino‐Korean Block and western Laurentia, where the lowermost Cambrian strata which formed in various depositional environments on the uneven basement rocks were followed by extensive tide‐dominated siliciclastic successions. These successions were then overlain by epeiric carbonate platforms that developed synchronously across the area as siliciclastic input diminished with the continued transgression. This comparison demonstrates that the transgressive sequences in the Sino‐Korean Block and western Laurentia can be understood within a framework that explains how extensive Cambrian carbonate platforms initially developed due to a second‐order eustatic sea‐level rise during the Cambrian greenhouse period.

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Observed tidal currents on the continental shelf off the east coast of India

Cited by 21 publications

References 46 publications

Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics

Modeling of Internal Tides in the Western Bay of Bengal: Characteristics and Energetics

Role of internal tide mixing in keeping the deep Andaman Sea warmer than the Bay of Bengal

The early–middle Cambrian siliciclastic tide‐dominated succession in eastern Korea

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