Development of a numerical marine weather routing system for coastal and marginal seas using regional oceanic and atmospheric simulations

Kurosawa, Kenta; Uchiyama, Yusuke; Kosako, Taichi

doi:10.1016/j.oceaneng.2019.106706

Cited by 17 publications

(7 citation statements)

References 29 publications

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“…The oneway off-line nesting approach described in Mason et al (2010) and Uchiyama et al (2018a) was applied to accomplish seamless multidomain nesting with the combined Orlanski-type radiation condition and influx nudging condition towards the parent model output. This JCOPE2-ROMS downscaling system (Uchiyama et al, 2017b;Uchiyama et al, 2018a) has been used for several different Asian marginal seas with extensive validations against satellite and in situ observations (e.g., Kamidaira et al, 2018;Masunaga et al, 2018;Tada et al, 2018;Kamidaira et al, 2019;Kurosawa et al, 2020;Kamidaira et al, 2021;Zhang et al, 2022) and has been successfully extended to quadruple nested configurations with further downscaling (e.g., Uchiyama et al, 2018d;Zhang et al, 2019;Uchiyama et al, 2022).…”

Section: Downscaling 3-d Ocean Circulation Modelmentioning

confidence: 99%

Quantifying connectivity between mesophotic and shallow coral larvae in Okinawa Island, Japan: a quadruple nested high-resolution modeling study

2023

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Coral bleaching has recently been occurring extensively across the world’s oceans, primarily because of high water temperatures. Mesophotic corals that inhabit depths of approximately 30–150 m are expected to survive bleaching events and reseed shallow water corals afterward. In Okinawa, Japan, mesophotic coral ecosystems have been reported to serve as a refuge for preserving the genotypic diversity of bleaching-sensitive corals. The connectivity of larval populations among different habitats is a key element that determines the area to be conserved in desirable coral ecosystems. Because coral larvae are largely transported passively by ambient oceanic currents, particularly in the horizontal direction, numerical ocean circulation models greatly help to quantify connectivity with detailed spatiotemporal network structures. The present study aimed to quantify the short-distance connectivity of shallow and mesophotic coral larvae in reef areas on the northwest coast of Okinawa Island. To this end, a quadruple nested high-resolution synoptic ocean model at a lateral spatial grid resolution of 50 m was developed, which was capable of realizing detailed coastal currents influenced by complex nearshore topography, and coupled with an offline 3-D Lagrangian particle-tracking model. After validating the developed model, short-distance horizontal coral connectivity across reef areas on the northwest coast was successfully evaluated. The alongshore lateral connectivity had apparent asymmetry caused by depth-dependent horizontal currents, whereas the larvae spawned at shallow and mesophotic depths were reachable to each other. Such across-depth larval dispersal was attributable to the mixed-layer depth in the spawning period, viz., the boreal spring, which approximately coincides with the boundary between shallow and mesophotic coral, leading to the intensive vertical exchange of virtual larvae.

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Section: Downscaling 3-d Ocean Circulation Modelmentioning

confidence: 99%

Quantifying connectivity between mesophotic and shallow coral larvae in Okinawa Island, Japan: a quadruple nested high-resolution modeling study

2023

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“…These are items that have a large mass, high centre of gravity and large windage area, which affect the installation's motions and its responses to the environment. Trading tankers may use weather routing to avoid rough weather or alter their operational headings (Olsen et al 2006;Dickson et al 2019;Szlapczynska and Szlapczynski 2019;Gkerekos and Lazakis 2020;Kurosawa et al 2020), but ship-shaped offshore installations are fixed in the same location and are constantly subject to site-specific environmental conditions. Single-point mooring systems are used to secure ship-shaped offshore installations that operate in harsh environmental conditions.…”

Section: Trading Tankers Versus Ship-shaped Offshore Installationsmentioning

confidence: 99%

Ship-Shaped Offshore Installations

Paik¹

2022

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Extensively updated for the second edition, this handy guide covers the safety engineering of ship-shaped offshore installations at every stage of design, construction, operation, lifetime healthcare and decommissioning. New sections cover additional types of offshore structures, including offshore power plants, as well as cutting-edge technologies and all the latest advances in the field. The text focuses on minimising accidents and the effects of extreme conditions, with new chapters covering earthquakes, hurricanes and terrorist attacks, as well as traditional types of accidental events such as hull girder collapse, collisions, fires and explosions. This is an invaluable resource for students who will be approaching the subject for the first time as well as practising engineers and researchers.

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“…The initial and side boundary conditions for the ROMS were provided by monthly climatology of the assimilative JCOPE2 oceanic reanalysis (Miyazawa et al, 2009). A one-way offline nesting technique was employed to convey the parent JCOPE2 to the child ROMS model with grid resolution refinement (e.g., Mason et al, 2010;Uchiyama et al, 2014;Kamidaira et al, 2017;Uchiyama et al, 2017;Kamidaira et al, 2018;Uchiyama et al, 2018a;Uchiyama et al, 2018b;Uchiyama et al, 2018c;Tada et al, 2018;Masunaga et al, 2018;Kamidaira et al, 2019;Masunaga et al, 2019;Zhang et al, 2019;Kurosawa et al, 2020;Kamidaira et al, 2021;Takeda et al, 2021;Uchiyama et al, 2022;Masunaga et al, 2022;Matsushita et al, 2022). Therefore, the horizontal grid spacing was successfully reduced from 1/12°(~10 km) of the JCOPE2 reanalysis to 3 km of the ROMS model, and vertically into stretched 32 s-layers (Shchepetkin and McWilliams, 2005) with grid height refinement near the surface and bottom to adequately resolve the boundary layers.…”

Section: Ocean Circulation Modelmentioning

confidence: 99%

Seasonal variability of upper ocean primary production along the Kuroshio off Japan: Roles of eddy-driven nutrient transport

et al. 2022

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We assessed spatial and seasonal variabilities of eddy-driven vertical nutrient fluxes, which are essential for maintaining primary production in the upper ocean. A climatological model based on a Regional Oceanic Modeling System (Regional Oceanic Modeling System) coupled with a Nutrient Phytoplankton Zooplankton and Detritus (NPZD) biogeochemical model at a submesoscale eddy-permitting resolution was used to investigate the mechanisms driving such variabilities around the Kuroshio, off the coast of Japan. The model realistically reproduced the spatial segmentations in primary production on both sides of the Kuroshio path with a higher chlorophyll-a concentration on the northern side than the southern side. In winter, downward eddy-induced nitrate flux is predominantly provoked in the upstream Kuroshio region (KR), while upward nitrate fluxes prevail in the downstream Kuroshio Extension (KE) region, due to both shear and baroclinic instabilities. Baroclinic instability plays a crucial role in inducing seasonal variability, leading to enhancement (reduction) of the eddy flux in winter (summer), particularly in regions away from the Kuroshio axis. Furthermore, we found that the influence of the Izu-Ogasawara Ridge, located in the KR, on regional dynamics and resultant spatial variability of the biogeochemical response are mostly confined in the KR. The Kuroshio is less turbulent in the upstream of the ridge, while it becomes unstable to shed mesoscale eddies in laterally wider and vertically deeper regions downstream. Consequently, although the near-surface nitrate concentration is lower downstream, the upward eddy-driven nitrate flux is more effective in maintaining active primary production due to the shear and baroclinic instabilities in winter.

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Development of a numerical marine weather routing system for coastal and marginal seas using regional oceanic and atmospheric simulations

Cited by 17 publications

References 29 publications

Quantifying connectivity between mesophotic and shallow coral larvae in Okinawa Island, Japan: a quadruple nested high-resolution modeling study

Quantifying connectivity between mesophotic and shallow coral larvae in Okinawa Island, Japan: a quadruple nested high-resolution modeling study

Ship-Shaped Offshore Installations

Seasonal variability of upper ocean primary production along the Kuroshio off Japan: Roles of eddy-driven nutrient transport

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