Article
Thermodynamics
Patxi Garcia Novo, Yusaku Kyozuka
Summary: Tidal current energy offers predictability and stability, making it a viable option for providing stable and continuous power to the grid. By evaluating multiple combinations of turbine types at different tidal energy sites, this study found that tidal stream energy can achieve high capacity factors and low coefficients of variance, showing its potential as a reliable renewable energy source.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Wei Mei, Shuo Li
Summary: Using atmospheric simulations forced with observed sea surface temperatures, the study investigates the variability and predictability of tropical cyclone genesis frequency (TCGF) in the northwest Pacific. Results show that the model can reproduce the observed TCGF variability in certain sub-basin regions, but has limited skill in other regions. Above-normal TCGF is linked to enhanced relative SST.
JOURNAL OF CLIMATE
(2022)
Article
Meteorology & Atmospheric Sciences
Zhangqi Dai, Bin Wang, Ling Zhu, Jian Liu, Weiyi Sun, Longhui Li, Guonian Lu, Liang Ning, Mi Yan, Kefan Chen
Summary: Atlantic Multidecadal Variability (AMV) is an important driver of regional and global climate variability. This study examines the secular changes of AMV over the past 2000 years and its response to external forcing. Proxy data and model simulations consistently show a significant 60-year AMV during AD 1250-1860, which is absent during AD 1-1249. Active volcanic eruptions during the period 1250-1860 amplify AMV and shift its frequency peak from 20-40 years to 60 years. Volcanoes contribute to the prolonged periodicity of AMV by sustaining Arctic cooling and delaying subpolar sea ice melting, reducing evaporation, and increasing surface salinity. These findings enhance our understanding of nonstationary AMV and the role of external forcing over the past two millennia.
JOURNAL OF CLIMATE
(2022)
Article
Engineering, Marine
M. R. Lekkala, L. Mohamed, J. H. Jung, C. K. Jin, B. Li, B. Jeong, D. K. Kim
Summary: This numerical study investigates the three-dimensional unsteady flow behind double wavy (DW), single wavy (SW), and smooth circular (SC) cylinders at subcritical Reynolds number (Re = 3.0 x 103) using large-eddy simulations based on the finite volume method. The study explores the effects of geometric disturbances as a passive flow control method for reducing hydrodynamic forces on the cylinders. The results show that the DW cylinder significantly reduces drag and lift coefficients compared to the SC and SW cylinders, with the maximum reduction observed at λ/Dm = 6.06. The study also reveals that the DW cylinder has a longer vortex formation length and can be used to minimize force coefficients at a sub-critical flow regime.
Article
Engineering, Marine
Guangyong Yang, Zhaoyong Mao, Tianqi Zhang, Wenlong Tian
Summary: This study focuses on the use of slotted blades to enhance the efficiency of horizontal axis tidal turbines (HATTs) and investigates the flow control mechanism of these slots using computational fluid dynamics (CFD) methods. The results indicate that the width and position of the slots have a significant influence on the lift-to-drag ratio of the hydrofoils, resulting in a maximum increase of 166% in the 2D simulations. For the 3D blades, the simulation results reveal that the slot can enhance the power coefficient of the blades, particularly at low tip-speed ratios, with a maximum increase of 7.8%.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Ji-Seok Hong, Jae-Hong Moon, Taekyun Kim, Il-Hyoung Cho, Jongsu Choi, Ji Yong Park
Summary: This study demonstrates that tidal currents significantly affect wave energy distribution in the western sea of Jeju Island. When the tidal current direction aligns with wave propagation, wave height decreases with energy transfer to longer wave periods, while the opposite occurs when they flow in opposite directions. The ocean-wave coupling model improves wave condition estimation and is useful for assessing wave energy potential and site selection.
Article
Oceanography
Nicola Jane Brown, Cecilie Mauritzen, Camille Li, Erica Madonna, Pal Erik Isachsen, J. H. LaCasce
Summary: In this study, we investigated the drivers of variability in the Norwegian Atlantic Slope Current using satellite altimetry and ocean reanalysis data. We found that the highest and lowest extremes in ocean transport occur over two days as atmospheric pressure systems approach, resulting in water piling up or extracting at the coast of Norway. Other sources of short-term variability are unlikely to have covariability over large separations. Monthly variability can be explained by passing weather systems.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Biochemistry & Molecular Biology
Celia Schunter, Michael D. Jarrold, Philip L. Munday, Timothy Ravasi
Summary: The study found that in a stable elevated pCO(2) environment, both species of coral reef fishes showed a consistent brain molecular response, including the downregulation of immediate early genes. The transcriptional program was more strongly affected by higher average pCO(2) in stable conditions. The largest difference in molecular response was between stable and fluctuating pCO(2) treatments, indicating that the response to environmental pCO(2) conditions differs for organisms living in fluctuating versus stable environments.
Article
Meteorology & Atmospheric Sciences
Holly C. Ayres, James A. Screen, Edward W. Blockley, Thomas J. Bracegirdle
Summary: The reduction of Antarctic sea ice leads to lower-tropospheric warming and moistening, as well as increased tropical sea surface temperatures, triggering global ocean and atmospheric responses. Coupling between the atmosphere and ocean allows for the spread of warming effects and energy transport from pole to pole. Ocean coupling also results in changes in ocean currents and atmospheric circulation, with implications for global climate patterns.
JOURNAL OF CLIMATE
(2022)
Article
Engineering, Marine
Linta Rose, Rohith B, Prasad K. Bhaskaran
Summary: This study investigates the temporal change in tides under the background of rapid sea level rise in a highly vulnerable coastal region. It highlights the existence of non-astronomic tidal variability at seasonal and secular time-scales, along with increasing low and high tidal levels. The study also suggests that tidal predictions based on changing sea level can improve the accuracy of tidal predictions and advance studies regarding regional sea level change, coastal flooding, and tide-surge interaction.
Article
Meteorology & Atmospheric Sciences
Chiung-Yin Chang, Malte F. Jansen
Summary: Building on previous work, this study explores the time-dependent response of the Atlantic meridional overturning circulation (AMOC) to a sudden global temperature change. The study finds that the previously identified mechanisms still hold true in explaining the transient and long-term responses of the AMOC. The temperature-driven stratification change is primarily influenced by the temperature contrast between the North Atlantic Deep Water and Antarctic Bottom Water, while the salinity change is driven by variations in Antarctic sea ice formation. Additionally, the study reveals the emergence of AMOC variability in colder and warmer climates.
JOURNAL OF CLIMATE
(2022)
Article
Geography, Physical
Yufang Ye, Yanbing Luo, Yan Sun, Mohammed Shokr, Signe Aaboe, Fanny Girard-Ardhuin, Fengming Hui, Xiao Cheng, Zhuoqi Chen
Summary: Arctic sea ice type (SITY) variation is an important indicator of climate change, but there is a lack of systematic comparison and analysis of SITY products. This study analyzed multiple SITY products from different retrieval approaches and compared them with sea ice age product and synthetic aperture radar (SAR) images. The results showed variations in the extent of Arctic multiyear ice (MYI) among the SITY products, with some products performing better than others in different time periods. Factors such as the type of scatterometer used, the combination of scatterometer and radiometer data, the quality of training data, and post-processing corrections can impact the performance of SITY products.
Article
Multidisciplinary Sciences
Chun Zhou, Xin Xiao, Wei Zhao, Jiayan Yang, Xiaodong Huang, Shoude Guan, Zhiwei Zhang, Jiwei Tian
Summary: The deep-water overflow transport from the Pacific into the South China Sea has increased by 9% since 2009, which may have significant implications for overturning circulations and biogeochemical processes in this region.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Mechanical
Stefan Hoerner, Shokoofeh Abbaszadeh, Olivier Cleynen, Cyrille Bonamy, Thierry Maitre, Dominique Thevenin
Summary: Current state-of-the-art technologies in wind and tidal energy exploitation focus on axial turbines, but cross-flow hydrokinetic tidal turbines offer higher power density and simpler design. Traditional turbines face challenges of low efficiency and fatigue failure, while a new bioinspired approach with hyperflexible blades can improve efficiency and lifespan without compromising on design simplicity.
EXPERIMENTS IN FLUIDS
(2021)
Article
Meteorology & Atmospheric Sciences
Weimin Jiang, Guillaume Gastineau, Francis Codran
Summary: The climate responses to fluctuations in the Atlantic meridional overturning circulation (AMOC) were investigated using sensitivity experiments. Modifications were made to the baroclinic component of the North Atlantic Ocean currents in an atmosphere-ocean general circulation model, which reproduced the typical AMOC multidecadal variability. Results showed that a strong AMOC led to widespread warming in the Northern Hemisphere and a northward shift of the intertropical convergence zone over the Atlantic Ocean. The driving mechanism for these climate responses was found to be an anomalous cross-equatorial Hadley circulation transporting energy and moisture.
JOURNAL OF CLIMATE
(2023)
Article
Oceanography
Christian Mohn, Martin White, Anneke Denda, Svetlana Erofeeva, Barbara Springer, Robert Turnewitsch, Bernd Christiansen
Summary: The interaction between biophysical properties and hydrodynamic features at Senghor Seamount in the tropical Northeast Atlantic was investigated, revealing complex and varied flow phenomena at different temporal and spatial scales. The seamount is exposed to energetic mesoscale eddy activity in surrounding waters, potentially leading to large physical and biological implications.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Marine & Freshwater Biology
Marie Maar, Janus Larsen, Camille Saurel, Christian Mohn, Jens Murawski, Jens Kjerulf Petersen
Summary: Transplanting blue mussels from hypoxic donor areas to more suitable growth areas can mitigate hypoxia in eutrophic estuaries, prevent mass mortalities, and reduce negative environmental impacts.
Article
Environmental Sciences
Jens Murawski, Jun She, Christian Mohn, Vilnis Frishfelds, Jacob Woge Nielsen
Summary: Coastal zones are dynamic environments requiring adaptive water management for balancing economic and social interests with environmental concerns. High-quality marine data and operational models with high resolution are essential for decision-making processes. The study on the Limfjord highlights the importance of computational efficiency, improved radiation scheme, high-resolution atmospheric forcing, accurate bathymetry, and river forcing for successful modeling of coastal-estuary systems. The HBM model demonstrates adequate performance for sea level, salinity, and temperature predictions, suitable for storm surge warning and coastal management applications.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Anna-Selma Van der Kaaden, Christian Mohn, Theo Gerkema, Sandra R. Maier, Evert de Froe, Johan van de Koppel, Max Rietkerk, Karline Soetaert, Dick van Oevelen
Summary: The study found that increasing mound height led to higher horizontal velocities but lower turbulent energy dissipation and vertical velocities around the foot of the mound, limiting coral growth in later stages. However, increased turbulent energy dissipation and vertical velocities on the mound top and upper flanks indicated continued vertical growth of the mounds.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Environmental Sciences
Vibe Schourup-Kristensen, Marie Maar, Janus Larsen, Christian Mohn, Jens Murawski, Jun She, Hans H. Jakobsen
Summary: European legislation mandates the monitoring of toxic algae in marine areas where shellfish are harvested for consumption. This study introduces a methodology to divide coastal and estuarine waters into homogeneous bodies for monitoring toxic algae, based on water transport and oceanographic characteristics. The proposed method has been successfully applied in areas with complicated coastal morphology, making it adaptable to other estuarine and coastal regions where toxic algae monitoring is required.
MARINE POLLUTION BULLETIN
(2021)
Article
Ecology
Telmo Morato, Carlos Dominguez-Carrio, Christian Mohn, Oscar Ocana Vicente, Manuela Ramos, Luis Rodrigues, Iris Sampaio, Gerald H. Taranto, Laurence Fauconnet, Ines Tojeira, Emanuel J. Goncalves, Marina Carreiro-Silva
Summary: The discovery of a dense, near-natural, and novel octocoral garden on the slopes of the Mid-Atlantic Ridge at depths of 545-595 meters, which meets FAO criteria for Vulnerable Marine Ecosystems, provides new insights into the functioning of mid-ocean ridges' ecosystems. The presence of biogenic and geological topographies associated with mid-ocean ridges suggests their global importance for deep-sea biodiversity. Further research is needed to better understand the processes involved and narrow knowledge gaps regarding biophysical connections with benthic fauna at small spatial scales along mid-ocean ridges.
ECOLOGY AND EVOLUTION
(2021)
Correction
Oceanography
[Anonymous]
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Letter
Multidisciplinary Sciences
Sergio Rossi, Lorenzo Bramanti, Paulo Horta, Louise Allcock, Marina Carreiro-Silva, Martina Coppari, Vianney Denis, Louis Hadjioannou, Enrique Isla, Carlos Jimenez, Mark Johnson, Christian Mohn, Covadonga Orejas, Andreja Ramsak, James Reimer, Baruch Rinkevich, Lucia Rizzo, Maria Salomidi, Toufiek Samaai, Nadine Schubert, Marcelo Soares, Ruth H. Thurstan, Paolo Vassallo, Patrizia Ziveri, Juanita Zorrilla-Pujana
Article
Environmental Studies
P. P. E. Weaver, J. Aguzzi, R. E. Boschen-Rose, A. Colaco, H. de Stigter, S. Gollner, M. Haeckel, C. Hauton, R. Helmons, D. O. B. Jones, H. Lily, N. C. Mestre, C. Mohn, L. Thomsen
Summary: Deep-sea mining, particularly the mining of polymetallic nodules, is likely to have both positive aspects such as increasing metal supply for battery production, and negative aspects such as large-scale environmental impacts. This article discusses the potential impacts of sediment plumes generated by mining vehicles near the seabed, as well as methods for measuring and comparing different mining vehicles. The findings of this study will assist the International Seabed Authority in regulating deep-sea mining activities and promoting the use of best available technology and environmental practices.
Correction
Geochemistry & Geophysics
Marta Arjona-Camas, Pere Puig, Albert Palanques, Ruth Duran, Martin White, Sarah Paradis, Mikhail Emelianov
MARINE GEOPHYSICAL RESEARCH
(2022)
Article
Oceanography
Evert de Froe, Sandra R. Maier, Henriette G. Horn, George A. Wolff, Sabena Blackbird, Christian Mohn, Mads Schultz, Anna-Selma van der Kaaden, Chiu H. Cheng, Evi Wubben, Britt van Haastregt, Eva Friis Moller, Marc Lavaleye, Karline Soetaert, Gert-Jan Reichart, Dick van Oevelen
Summary: This study examines the distribution of organic matter under tidal activity in a transect on the south-eastern slope of Rockall Bank in the Northeast Atlantic Ocean. Results show that the water column above the coral mound is more dynamic, with high variability in physical parameters and nutrient concentrations in the bottom water. A diurnal tidal wave replenishes nutrients in the surface water, while an internal wave is recorded above the coral mound. The benthic community feeds on various food sources, including phytodetritus and zooplankton.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Geosciences, Multidisciplinary
Sabine Haalboom, Henko C. de Stigter, Christian Mohn, Thomas Vandorpe, Marck Smit, Laurens de Jonge, Gert-Jan Reichart
Summary: This study presents different experimental designs for monitoring sediment plumes produced by deep-sea mining. Two field tests were conducted in a shallow setting offshore southern Spain using the Apollo II mining vehicle. The tests provided valuable insights for monitoring nodule mining in the deep Pacific. The plume of suspended sediment was monitored using turbidity sensors deployed on a ship-operated CTD system and on a static array of moored sensors, as well as visually with a ship-operated ROV. The results showed the distribution and behavior of the sediment plume and provided recommendations for monitoring in deep-sea conditions.
Review
Oceanography
Christian Mohn, Jorgen L. S. Hansen, Marina Carreiro-Silva, Stuart A. Cunningham, Evert de Froe, Carlos Dominguez-Carrio, Stefan Gary, Ronnie N. Glud, Cordula Goke, Clare Johnson, Telmo Morato, Eva Friis Moller, Lorenzo Rovelli, Kirstin Schulzi, Karline Soetaert, Anna van der Kaaden, Dick van Oevelen
Summary: Cold-water corals (CWCs) thrive in areas with complex and rough topography, but little is known about how basin-scale changes in the ocean climate affect their growth. In this study, high-resolution hydrodynamic models were used to investigate the impact of variations in basin-scale currents on local hydrodynamics and CWC communities. It was found that the variability of near-bottom currents and water mass properties at different AMOC states strongly influenced the CWC distribution. The kinetic energy dissipation rate was proposed as a mechanistic descriptor of CWC presence, providing insight into the hydrodynamics driving organic matter supply to these communities.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Oceanography
E. W. Willcox, J. Bendtsen, J. Mortensen, C. Mohn, M. Lemes, T. J. Pedersen, J. Holding, E. F. Moller, M. K. Sejr, M. S. Seidenkrantz, S. Rysgaard
Summary: This study presents a synoptic survey of the Northeast Greenland shelf and slope during late summer 2017, investigating hydrography, nutrients, conservative tracers, and climate factors. The results indicate that the Laptev Sea is a major freshwater source in the region during this period, and there is no conclusive evidence of Pacific Water. The observations suggest a direct link between Northeast Greenland hydrology and processes occurring on Eurasian shelves.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Caroline Bouchard, Julek Chawarski, Maxime Geoffroy, Apasiri Klasmeier, Eva Friis Moller, Christian Mohn, Mette Dalgaard Agersted
Summary: Arctic cod dominates the ichthyoplankton assemblages in the High Arctic seas, and the competition with other native species has rarely been studied. This study examines the resource partitioning and potential interspecific competition among Arctic cod and other species in the Greenland Sea. The findings suggest limited interspecific competition among the early life stages of Arctic fishes, although changing conditions and northward range expansion due to climate change could increase competition and negatively impact the recruitment of Arctic ichthyoplankton.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2022)
