Projection of “strong wind” events related to recovery from hypoxia in Tokyo Bay, Japan

Nakayama, Keisuke; Maruya, Yasuyuki; Nakaegawa, Tosiyuki; Komai, Katsuaki; Kokubo, Kazuki; Ishida, Tamao; Okada, Tomonari

doi:10.1002/hyp.9829

Cited by 12 publications

(4 citation statements)

References 24 publications

(37 reference statements)

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“…In contrast, persistent southwest winds tend to suppress estuarine circulation and the exchange of oceanic waters, and thus, contribute to the onset of hypoxia (Nakayama et al, 2010). However, strong southwesterly winds above a threshold of 10 m s − 1 cause rapid recovery from hypoxia due to the mixing of the inner bay water with oceanic water (Sato et al, 2012;Nakayama et al, 2010Nakayama et al, , 2013. Further, the recovery of oxygen concentrations is shown to be a function of the duration of these strong winds and of the antecedent oxygen concentrations.…”

Section: Tokyo Baymentioning

confidence: 94%

System controls of coastal and open ocean oxygen depletion

Pitcher

Aguirre-Velarde

Breitburg

et al. 2021

Progress in Oceanography

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The epoch of the Anthropocene, a period during which human activity has been the dominant influence on climate and the environment, has witnessed a decline in oxygen concentrations and an expansion of oxygendepleted environments in both coastal and open ocean systems since the middle of the 20th century. This paper provides a review of system-specific drivers of low oxygen in a range of case studies representing marine systems in the open ocean, on continental shelves, in enclosed seas and in the coastal environment. Identification of similar and contrasting responses within and across system types and corresponding oxygen regimes is shown to be informative both in understanding and isolating key controlling processes and provides a sound basis for predicting change under anticipated future conditions. Case studies were selected to achieve a balance in system diversity and global coverage. Each case study describes system attributes, including the present-day oxygen environment and known trends in oxygen concentrations over time. Central to each case study is the identification of the physical and biogeochemical processes that determine oxygen concentrations through the tradeoff between ventilation and respiration. Spatial distributions of oxygen and time series of oxygen data provide the opportunity to identify trends in oxygen availability and have allowed various drivers of low oxygen to be distinguished through correlative and causative relationships. Deoxygenation results from a complex interplay of hydrographic and biogeochemical processes and the superposition of these processes, some additive and others subtractive, makes attribution to any particular driver challenging. System-specific models are therefore required to achieve a quantitative understanding of these processes and of the feedbacks between processes at varying scales.

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Section: Tokyo Baymentioning

confidence: 94%

System controls of coastal and open ocean oxygen depletion

Pitcher

Aguirre-Velarde

Breitburg

et al. 2021

Progress in Oceanography

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“…Most propylene is used to produce polypropylene and to manufacture commodities used in several industries worldwide, from pharmaceuticals and cosmetics to all kinds of plastics and textiles . The annual propylene production was approximately 100 million tons worldwide in 2016 and has an expected growth rate of 3.6% by 2025 . This light olefin is usually obtained by the steam cracking of naphtha, or alternatively, as a byproduct of fluid catalytic cracking of gas oils in refineries.…”

Section: Introductionmentioning

confidence: 99%

Propane and Propylene Separation with Carbon Dioxide at Mild Temperatures by Gas-Phase Simulated Moving Bed in Binderfree Zeolite 13X

Seabra

Dias

Regufe

et al. 2023

Ind. Eng. Chem. Res.

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This work studied the separation of propane and propylene using carbon dioxide as a desorbent and binderfree zeolite 13X as adsorbent. The process occurred at a mild temperature (323 K) using the gas-simulated moving bed (SMB) technology. Adsorption equilibrium isotherms of propylene, propane, and carbon dioxide were measured gravimetrically in a temperature range from 323 to 423 K and a pressure up to 5 bar. Breakthrough experiments were performed at 323 K and 3 bar. Binary adsorption equilibrium data were obtained from the dynamic experiments. Non-ideal adsorption behavior was observed for the adsorbate−adsorbent pairs; therefore, the multicomponent adsorption equilibrium was predicted with the RAST-aNRTL model. An SMB experiment was performed in the gas-SMB unit. For the 0.5/0.5 propane/propylene (molar-based) feed composition, a propylene purity of 98.8% was obtained, with a recovery above 98% and a productivity of 40.8 kg C3H6 h −1 m ads −3 . This work experimentally demonstrated that it is possible to produce highpurity propylene with a high recovery using binderfree zeolite 13X as adsorbent and carbon dioxide as a desorbent at mild temperature (323 K).

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“…Climate change mitigation and adaptation strategies are urgently needed (IPCC, 2014) to reduce the negative impacts associated with natural disasters, such as flood inundation and landslides (Hirabayashi et al, 2013; Tezuka et al, 2013), biodiversity loss (Dutta et al, 2013; Thuiller, 2007), and land and water degradation (Fragoso et al, 2011; Me et al, 2018; Nakayama et al, 2010, 2013; Sachse et al, 2014; Satoh et al, 2012; Song et al, 2018). Restoration of submerged aquatic vegetation (SAV) in aquatic ecosystems has been suggested as a potential mitigation strategy (Nellemann et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Integration of Submerged Aquatic Vegetation Motion Within Hydrodynamic Models

Nakayama

Shintani

Komai

et al. 2020

Water Resources Research

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Aquatic models used for both freshwater and marine systems frequently need to account for submerged aquatic vegetation (SAV) due to its influence on flow and water quality. Despite its importance, parameterizations are generally adopted that simplify feedbacks from SAV, such as canopy properties (e.g., considering the deflected vegetation height) and the bulk friction coefficient. This study reports the development of a fine‐scale non‐hydrostatic model that demonstrates the two‐way effects of SAV motion interaction with the flow. An object‐oriented approach is applied to capture the multiphase phenomena, whereby a leaf‐scale SAV model based on a discrete element method is combined with a flow dynamics model to resolve stresses from currents and waves. The model is verified through application to a laboratory‐scale seagrass bed. A force balance analysis revealed that leaf elasticity and buoyancy are the most significant components influencing the horizontal and vertical momentum equations, respectively. The sensitivity of canopy‐scale bulk friction coefficients to water depth, current speeds, and vegetation density of seagrass was explored. Deeper water was also shown to lead to a smaller decrease in vegetation height. The model approach can contribute to improving assessment of processes influencing water quality, sediment stabilization, carbon sequestration, and SAV restoration, thereby supporting an understanding of how waterways and coasts will respond to changes brought about by development and a changing climate.

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Projection of “strong wind” events related to recovery from hypoxia in Tokyo Bay, Japan

Cited by 12 publications

References 24 publications

System controls of coastal and open ocean oxygen depletion

System controls of coastal and open ocean oxygen depletion

Propane and Propylene Separation with Carbon Dioxide at Mild Temperatures by Gas-Phase Simulated Moving Bed in Binderfree Zeolite 13X

Integration of Submerged Aquatic Vegetation Motion Within Hydrodynamic Models

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