Modelling tidally induced larval dispersal over Anton Dohrn Seamount

Stashchuk, Nataliya; Vlasenko, Vasiliy; Howell, Kerry L.

doi:10.1007/s10236-018-1206-0

Cited by 5 publications

(9 citation statements)

References 21 publications

(20 reference statements)

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“…When the ocean flow impinges on a seamount, a series of complex dynamic responses are generated that modulate local and large‐scale circulation (Lavelle & Mohn, 2010; Perfect et al, 2018, 2020a, 2020b; Robertson et al, 2017; White & Mohn, 2004). These dynamic processes around the seamount also contribute to local biological and geological distribution (Boehlert & Genin, 1987; Genin, 2004; Mitchell et al, 2015; Stashchuk et al, 2018; Vlasenko et al, 2018; White & Mohn, 2004; White et al, 2007). Hence, local circulation induced by the seamount topography is important to the energy and material exchanges in the deep ocean.…”

Section: Introductionmentioning

confidence: 99%

Observed Deep Anticyclonic Cap Over Caiwei Guyot

et al. 2020

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The mean circulation pattern and its mechanism over Caiwei Guyot (1,308-5,600 m) in the Northwest Pacific were studied utilizing 3 years of in situ data. A deep anticyclonic cap was found to enclose the entire guyot from its bottom up to a depth of 728 m, which is composed of a stable but highly asymmetric anticyclonic circulation at the foot and a bottom-trapped anticyclonic circulation over the summit. On the slope, the circulation is complex with a dominant anticyclonic circulation near the bottom and a weak cyclonic circulation at ∼2,200 m. The anticyclonic cap intensity over the summit is significantly modulated by the time-varying impinging flow. An intensified cold ring above the summit edge was observed at Caiwei Guyot, which differs from the cold domes observed over traditional conic seamounts. Further analysis suggests that the impinging flow is primarily responsible for the cap formation, and the M 2 tide-seamount interaction plays a secondary role. The anticyclonic cap may play a role in the local geological distribution. Plain Language Summary Seamounts are ubiquitous topographic features found in the global ocean, and understanding the effect of seamounts on local circulation has garnered significant attention from oceanographers. This study examines a topographically induced deep anticyclonic circulation system over Caiwei Guyot (CG, 1,308-5,600 m), which is a deep flat-topped seamount located in the Northwest Pacific Ocean, utilizing 3 years of in situ data. It was found to have a time-varying anticyclonic circulation at the summit and spatially variable anticyclonic circulation at the foot; however, along the slopes, the circulation is complex with a dominant anticyclonic circulation near the bottom and weak cyclonic circulation at ∼2,200 m. A ring of cold water above the summit edge was observed, which differs from the classical anticyclonic circulation system observed above a conical seamount. The mean impinging flow and the interaction between the semidiurnal tide and topography are responsible for generating the anticyclonic circulation system. Moreover, the anticyclonic circulation system could potentially influence the local geological distribution. To the authors' knowledge, this study provides the first comprehensive evaluation of an observed anticyclonic circulation system covering an entire deep flat-topped seamount.

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Section: Introductionmentioning

confidence: 99%

Observed Deep Anticyclonic Cap Over Caiwei Guyot

et al. 2020

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“…The great performance of the MITgcm on replication of internal tides was already checked and reported in many papers (e.g., Vlasenko et al, 2013Vlasenko et al, , 2014Vlasenko et al, , 2016Stashchuk et al, 2014Stashchuk et al, , 2018. These publications have shown the consistency of the observational data sets and the modeling outputs.…”

Section: The Modelmentioning

confidence: 78%

“…The experiments were restricted by 1,400 m depth. The spatial step between the position of the released particles was 450 m. The output model velocities were used as an input data set for the Lagrangian-type passive particle tracking model (Stashchuk et al, 2018) to reproduce the pathway of larvae from their initial position. In setting the time scale for the larvae spreading experiments, we followed the results of Larsson et al (2014) who showed that 50 days is the most real lifetime for larvae to be dispersed.…”

Section: Larvae Dispersionmentioning

confidence: 99%

“…The biological campaign was accompanied by oceanographic measurements that included a series of CTD (Conductivity, Temperature, Depth) stations and the deployment of two moorings in the area of Anton Dohrn Seamount. The analysis of the generation of internal waves by tides in areas of Anton Dohrn Seamount and the Wyville Thomson Ridge was reported in , Stashchuk et al (2018), and .…”

Section: Introductionmentioning

confidence: 99%

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Internal Wave Dynamics Over Isolated Seamount and Its Influence on Coral Larvae Dispersion

Stashchuk

Vlasenko

2021

Front. Mar. Sci.

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The internal wave dynamics over Rosemary Bank Seamount (RBS), North Atlantic, were investigated using the Massachusetts Institute of Technology general circulation model. The model was forced by M2-tidal body force. The model results are validated against the in-situ data collected during the 136th cruise of the RRS “James Cook” in June 2016. The observations and the modeling experiments have shown two-wave processes developed independently in the subsurface and bottom layers. Being super-critical topography for the semi-diurnal internal tides, RBS does not reveal any evidence of tidal beams. It was found that below 800-m depth, the tidal flow generates bottom trapped sub-inertial internal waves propagated around RBS. The tidal flow interacting with a cluster of volcanic origin tall bottom cones generates short-scale internal waves located in 100 m thick seasonal pycnocline. A weakly stratified layer separates the internal waves generated in two waveguides. Parameters of short-scale sub-surface internal waves are sensitive to the season stratification. It is unlikely they can be observed in the winter season from November to March when seasonal pycnocline is not formed. The deep-water coral larvae dispersion is mainly controlled by bottom trapped tidally generated internal waves in the winter season. A Lagrangian-type passive particle tracking model is used to reproduce the transport of generic deep-sea water invertebrate species.

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“…They demonstrated the feasibility of such a high-resolution unstructured grid model in accommodating very complex bathymetry and coastline, and in providing quantitative assessments of the modified circulation useful for local planning and management. Stashchuk et al (2018) tracked passive particles using currents from a general circulation model to simulate larval dispersal over the Anton Dohrn Seamount in the North Atlantic Ocean. The simulation shows that the majority of particles remains in the same depth band where they were initially released, suggesting that physical circulation processes, e.g., baroclinic tidal currents, may provide a potential isolating mechanism for the larvae; onlỹ 10% of particles can undergo maximum dispersal with successful recruitment to the benthos.…”

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confidence: 99%

The 9th International Workshop on Modeling the Ocean (IWMO 2017) in Seoul, Korea, July 3–6, 2017

et al. 2019

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The 9th International Workshop on Modeling the Ocean (IWMO 2017) was held in the modern campus of Yonsei University, Seoul, Korea, from July 3-6 2017. The workshop was attended by about 80 participants from countries all around the world, many of whom were young and earliercareer scientists: students and postdocs. Papers were presented covering a broad range of topics on field observations, analyses, and modeling: wave and air-sea interaction dynamics, climate variability, basin-scale processes and coastal oceanography, sea-ice dynamics, sediment transport, tropical cyclones, biogeochemical-physical coupling, boundary currents, sea-level rise, extreme events, ocean prediction and others. We were pleased to witness very high-quality research and presentations, many from young students and scientists. Thirty three (33) young scholars participated in the Outstanding Young Scientist Award (OYSA) competition; congratulations to all of them! The finalists of the IWMO-2017 OYSA were: R

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Modelling tidally induced larval dispersal over Anton Dohrn Seamount

Cited by 5 publications

References 21 publications

Observed Deep Anticyclonic Cap Over Caiwei Guyot

Observed Deep Anticyclonic Cap Over Caiwei Guyot

Internal Wave Dynamics Over Isolated Seamount and Its Influence on Coral Larvae Dispersion

The 9th International Workshop on Modeling the Ocean (IWMO 2017) in Seoul, Korea, July 3–6, 2017

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