Article
Multidisciplinary Sciences
Stefano Alberti, Ben Leshchinsky, Josh Roering, Jonathan Perkins, Michael J. Olsen
Summary: This study analyzes landslides in western Oregon to explore the relationship between landslide size and strength, and reveals that the gradient relationship between landslide thickness and cohesive strength may reflect subsurface weathering.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Corinne B. Trott, Bulusu Subrahmanyam, Caroline E. Washburn
Summary: The Agulhas Current responds to El Nino Southern Oscillation (ENSO) events with changes in temperature and salinity signatures. The research shows warming and high salinities after El Nino, cooling and fresher surface waters after La Nina, with a stronger temperature response. Wavelet coherence analysis reveals that salinity and ENSO are most strongly correlated about a year after the 2015 El Nino and two years after the 2016 La Nina.
Article
Engineering, Marine
S. Ponce de Leon, C. Guedes Soares
Summary: This study examines the generation of extreme waves in the Agulhas Current Retroflection as a result of strong wave-current interaction. High-resolution simulations using two third-generation wave models were performed, considering ocean surface currents, for a period of two years and six months. The study utilized high-resolution SWAN nested grids and investigated the effects of surface current velocities of mesoscale eddies on surface wave properties and energy.
Article
Ecology
Amanda Gerotto, Hongrui Zhang, Renata Hanae Nagai, Heather M. Stoll, Rubens Cesar Lopes Figueira, Chuanlian Liu, Ivan Hernandez-Almeida
Summary: Understanding the variations in ocean carbonate chemistry is essential for understanding the global carbon cycle. Fossil shells from marine calcifiers are widely used as proxies for past ocean carbon cycle. However, interpreting these records can be challenging due to physiological and ecological responses during organisms' life cycles and potential preservation at the seafloor. This study presents a new dissolution proxy based on the morphological attributes of coccolithophores from the Noelaerhabdaceae family. Evaluating the influences of calcification and preservation on fossil morphology, the results suggest that carbonate saturation of the deep ocean explains the highest proportion of variation in the morphological data.
Article
Ecology
Maximiliano Rodriguez, Christelle Not
Summary: This study developed temperature calibrations for two shallow marine ostracods, showing that they can be used as paleothermometers for paleoreconstructions. The Mg/Ca ratios of S. impressa and N. delicata ostracods were found to significantly correlate with temperature, with S. impressa being preferred for reconstructions. This method provides valuable information on oceanic circulation at a regional scale.
Article
Environmental Sciences
Zhengkun Dong, Yi Yang, Canfa Wang, James A. A. Bendle, Xiaoyan Ruan, Xiaoxia Lue, Shucheng Xie
Summary: A new temperature proxy, RANs, was proposed based on the analysis of the distribution and composition of 3-hydroxy fatty acids in sediment samples from the Bohai Sea and the South China Sea. It was found that short-chain 3-hydroxy fatty acids are temperature dependent, and a strong linear relationship between RANs and sea surface temperature was established. These findings suggest the potential of 3-hydroxy fatty acid based proxies for paleo-sea surface temperature reconstruction.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Marianna Marangi, Sabina Airoldi, Luciano Beneduce, Claudio Zaccone
Summary: The study found opportunistic pathogens, bacteria, and chemical pollutants in the fecal samples of free-ranging whales from the Pelagos Sanctuary in the Northern-Western Mediterranean Sea. More sequences related to Synergistetes and Spirochaetae were found in sperm whales compared to fin whales. Additionally, certain heavy metals were exclusively found in sperm whale fecal samples and others were only found in fin whale fecal samples.
SCIENTIFIC REPORTS
(2021)
Article
Geography, Physical
Yuxuan Wei, Wenfeng Deng, Jinlong Ma, Xuefei Chen, Ti Zeng, Gangjian Wei
Summary: This study investigated the climate and environmental significance of stable strontium isotope composition (delta Sr-88) in coral skeletons. The results showed that delta Sr-88 values were not significantly correlated with factors like sea surface temperature, but showed a significant correlation with total solar irradiance (TSI). TSI may play a major role in controlling coral delta Sr-88 values at the study site.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Dengfeng Xie, Feng Guo
Summary: This article presents a FFT-based implementation of the first-order small-slope approximation (SSA-1) for simulating normalized radar scattering cross section (NRCS) from ocean surface. The proposed method reduces the computation amount greatly compared to the classical implementation, while maintaining almost the same accuracy. The simulation results also show the feasibility of the proposed method for the simplified SSA-2 model.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2023)
Article
Biodiversity Conservation
Diego Rita, Asuncion Borrell, Alex Aguilar
Summary: Alkenones produced exclusively by certain haptophyte species can serve as a bio-indicator for water temperature. Findings show alkenones in blubber samples from Mediterranean predatory species, with striped dolphins and Risso's dolphins matching the expected water temperatures, while bottlenose dolphins did not show detectable levels of alkenones. Further research is needed to calibrate this indicator, but it is evident that alkenones are transferred through the trophic web to oceanic cetaceans at high trophic levels.
ECOLOGICAL INDICATORS
(2021)
Article
Engineering, Geological
G. Walton, S. Sinha
Summary: Pillars play a critical role in underground mining systems, with their mechanics depending on hardness and confinement. This study re-evaluates the pillar mechanics database, revealing a nonlinear relationship between pillar strength and UCS.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
M. Piantini, F. Gimbert, E. Korkolis, R. Rousseau, H. Bellot, A. Recking
Summary: Sediment flows generate ground vibrations through force fluctuations on the riverbed. However, linking force fluctuations to properties of highly concentrated sediment flows is challenging due to complexities from grain-to-grain interactions. In this study, downscaled flume experiments are conducted to measure force fluctuations, local seismic vibrations, and flow properties of highly concentrated sediment flows at high resolution. It is observed that force fluctuations exhibit hysteresis behaviors with flow surface elevation and mass, while having a unique negative relationship with solid concentration. The findings suggest that solid concentration should be incorporated as a key parameter in seismic models of such sediment flows.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Silvia Becagli, Christian Marchese, Laura Caiazzo, Virginia Ciardini, Luigi Lazzara, Giovanna Mori, Caterina Nuccio, Claudio Scarchilli, Mirko Severi, Rita Traversi
Summary: Based on the interpretation of ten years of biogenic aerosol data collected at Concordia Station in the East Antarctic plateau, three different scenarios can be drawn that are linked to sea ice, chlorophyll-a concentration, and the Southern Annular Mode. In early summer, biogenic aerosol is significantly correlated with sea ice retreats and increased phytoplankton biomass. In mid-summer, aerosol concentrations are low and not related to sea ice melting. In late summer, aerosol concentrations are highest and correlated with chlorophyll-a, but not sea ice. Additionally, there is significant year-to-year variability in aerosol concentrations, which is correlated with the Southern Annular Mode.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Matthew Carr, Tarron Lamont, Marjolaine Krug
Summary: This study compared several satellite-derived sea surface temperature products for research and monitoring applications in the southern African marine region. Overall, there was good agreement between merged sea surface temperature products for most of the region, but strong disagreement was observed at areas with complex temperature structures and strong sea surface temperature gradients. Seasonal bias in temperature discrepancy was found to be influenced by cloud cover and local oceanographic dynamics. Additional methods such as ingesting more in situ observations or daytime satellite acquisitions may be required to improve the representations in merged sea surface temperature products, especially in regions of high temperature variance.
Article
Geochemistry & Geophysics
Surajit Mondal, Ramananda Chakrabarti, Prosenjit Ghosh
Summary: Fish otoliths can serve as valuable archives for paleotemperature studies. This study demonstrates that the delta Ca-44/40 values and Sr/Ca ratio in fish otoliths can be used as temperature proxies, providing a reliable method for paleotemperature reconstruction.
Article
Meteorology & Atmospheric Sciences
Tobias Schulzki, Jan Harlass, Franziska U. Schwarzkopf, Arne Biastoch
Summary: While forced ocean hindcast simulations have limitations in simulating ocean-atmosphere feedbacks, fully coupled models lack accurate timing of variability. Partial coupling models have the potential to combine the advantages of both strategies, but their success is dependent on the timescale. The Atlantic Meridional Overturning Circulation (AMOC) is an important circulation system that influences the climate, and understanding its changes requires accurate models.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Computer Science, Interdisciplinary Applications
Christian Kehl, Peter D. Nooteboom, Mikael L. A. Kaandorp, Erik van Sebille
Summary: This paper assesses the applicability of performance enhancing techniques from Eulerian simulators to Lagrangian simulators and proposes a performance enhancement strategy specifically targeting physics-based Lagrangian particle simulations. Through experiments, it is found that I/O enhancing techniques and cache-efficient data structures significantly improve the speed of Lagrangian physics simulations, while other alternative data structures do not achieve the theoretically-expected performance increase.
COMPUTERS & GEOSCIENCES
(2023)
Article
Limnology
Federica Guerrini, Delphine Lobelle, Lorenzo Mari, Renato Casagrandi, Erik van Sebille
Summary: Marine microplastics can be colonized by biofouling microbial organisms, leading to a decrease in buoyancy. The sinking of biofouled microplastics could represent a new carbon export pathway in the ocean carbon cycle.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Geosciences, Multidisciplinary
Shouyi Wang, Caroline C. Ummenhofer, Delia W. Oppo, Sujata A. Murty, Patrick Wagner, Claus W. Boening, Arne Biastoch
Summary: The Makassar Strait plays a crucial role in the Indo-Pacific climate through its redistribution of heat and freshwater. Short-term observations indicate that wind-driven advection of freshwater from marginal seas affects the surface transport of the strait. However, longer-term observations are needed to fully understand the decadal variability.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Fisheries
Peter D. Nooteboom, Joe Scutt Phillips, Inna Senina, Erik van Sebille, Simon Nicol
Summary: Catch per unit of fishing effort (CPUE) is commonly used as an indicator of tuna abundance, assuming a proportional relationship between the two. However, this paper shows that simulated catch is best modeled by a non-linear dependence on both tuna and dFAD abundance. This finding suggests that estimators of CPUE at the population scale may be biased when assuming a linear catch response.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
C. W. Boening, P. Wagner, P. Handmann, F. U. Schwarzkopf, K. Getzlaff, A. Biastoch
Summary: Using high-resolution model experiments, the authors find that the rapid spreading of mid-depth density anomalies from the Labrador to the Irminger Sea is the main mechanism for decadal changes in the Atlantic overturning circulation. Changes in the Atlantic Meridional Overturning Circulation (AMOC) are crucial for Northern Hemisphere climate variability. Previous studies have attributed decadal overturning variability to deep winter convection in the Labrador Sea, but this linkage is challenged by transport observations. The authors report simulations which show that interannual variations in Labrador Sea convection have negligible impact, but exceptionally cold winters in the 1990s induced a positive AMOC anomaly through the spreading of mid-depth density anomalies into the Irminger Sea.
NATURE COMMUNICATIONS
(2023)
Article
Oceanography
Ilana Schiller-Weiss, Torge Martin, Johannes Karstensen, Arne Biastoch
Summary: Accelerated melting of the Greenland Ice Sheet has a significant impact on the freshwater balance in the subpolar North Atlantic. This study investigates the freshwater changes in the East Greenland Current system and identifies the drivers behind these changes. It is found that regional wind patterns, sea ice melt, and glacial ice and snow meltwater runoff, along with Arctic-sourced Polar Water, contribute to interannual variations in freshwater content. The study highlights the challenge of attributing ocean freshening events to Greenland meltwater inflow. The findings emphasize the need for improved ocean models and observations to detect and attribute local freshening events.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Meteorology & Atmospheric Sciences
Torge Martin, Arne Biastoch
Summary: Increasing melting of the Greenland Ice Sheet is expected to affect water mass transformation in the subpolar North Atlantic and the meridional overturning circulation. Our experiments show the significant role of mesoscale ocean dynamics and atmosphere feedback in projecting the climate system's response to enhanced Greenland Ice Sheet melting.
Article
Environmental Sciences
J. Murray Roberts, Colin W. Devey, Arne Biastoch, Marina Carreiro-Silva, Tina Dohna, Boris Dorschel, Vikki Gunn, Veerle A. I. Huvenne, David Johnson, Didier Jollivet, Ellen Kenchington, Kate Larkin, Marjolaine Matabos, Telmo Morato, Malik S. Naumann, Covadonga Orejas, J. Angel A. Perez, Stefan A. Ragnarsson, Albertus J. Smit, Andrew Sweetman, Sebastian Unger, Benjamin Boteler, Lea-Anne Henry
Summary: Ocean ecosystems are facing climate and biodiversity crises, and there is a lack of unified approach to assess their state and inform sustainable policies. This blueprint emphasizes research capabilities and cross-sectoral partnerships, and highlights priorities including integrating observation, modeling, and genomic approaches, improving ecosystem mapping, identifying potential tipping points, understanding compound impacts of multiple stressors, and enhancing spatial and temporal management and protection. International cooperation and funding are crucial to support science-led policies that conserve ocean ecosystems and transcend jurisdictional borders.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Stefanie L. Ypma, Quinten Bohte, Alexander Forryan, Alberto C. Naveira Garabato, Andy Donnelly, Erik van Sebille
Summary: In order to address the pollution problem in the Galapagos Islands, a methodology based on network theory and Lagrangian simulation was developed to identify the most effective cleanup locations. This approach provides guidance for optimizing cleanup efforts in heavily polluted regions with limited resources and unknown distribution of marine plastic debris.
Article
Ecology
Reint Fischer, Delphine Lobelle, Merel Kooi, Albert Koelmans, Victor Onink, Charlotte Laufkoetter, Linda Amaral-Zettler, Andrew Yool, Erik van Sebille
Summary: The fate of (micro)plastic particles in the open ocean is determined by biological and physical processes. The attachment, growth, and loss of algae on the particles, as well as wind-induced mixing and the sinking velocity of the particles, affect the vertical distribution of the particles.
Review
Environmental Sciences
Melanie Bergmann, France Collard, Joan Fabres, Geir W. Gabrielsen, Jennifer F. Provencher, Chelsea M. Rochman, Erik van Sebille, Mine B. Tekman
Summary: Plastic debris and microplastics are widespread in the Arctic, even in areas without human activity. They come from various sources, both local and distant, and are transported to the Arctic by ocean currents, atmospheric transport, and rivers. Once in the Arctic, plastic pollution accumulates and affects local ecosystems.
NATURE REVIEWS EARTH & ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Victor Onink, Erik van Sebille, Charlotte Laufkotter
Summary: This study presents 1D parametrizations of wind-driven turbulent mixing in the ocean surface mixed layer and discusses the advantages and disadvantages of different vertical diffusion coefficients. The results show that these models can be applied to studying the behavior of buoyant particles in the ocean.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Mikael L. A. Kaandorp, Stefanie L. Ypma, Marijke Boonstra, Henk A. Dijkstra, Erik van Sebille
Summary: This study investigates the accumulation of litter on the Dutch North Sea coast and identifies the influence of tides and coastline characteristics through a machine learning regression model. Understanding these processes can lead to more effective litter removal recommendations.
Article
Geosciences, Multidisciplinary
Peter D. Nooteboom, Peter K. Bijl, Christian Kehl, Erik van Sebille, Martin Ziegler, Anna S. von der Heydt, Henk A. Dijkstra
Summary: By simulating sinking particles in a global ocean model, the study reveals the impact of ocean currents on the composition of sedimentary microplankton. The detection of ocean bottom provinces in sedimentary microplankton datasets highlights their significance for paleoceanographic reconstruction.
EARTH SYSTEM DYNAMICS
(2022)
