Article
Geochemistry & Geophysics
Tal Benaltabet, Gil Lapid, Adi Torfstein
Summary: This study investigates the impact of short-term environmental perturbations on dissolved aluminum (Al) and silicate (Si) concentrations in the oceanic water column. The results demonstrate that dust storms, sediment resuspension, and rain events significantly affect the dissolution and scavenging processes of aluminum. Atmospheric deposition serves as a long-term source of aluminum in the oceans while also acting as a short-term sink through scavenging.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Manuel Colombo, Birgit Rogalla, Jingxuan Li, Susan E. Allen, Kristin J. Orians, Maria T. Maldonado
Summary: Research shows that the Canadian Arctic Archipelago region's sediment resuspension and sediment-water interactions result in the enrichment of iron in water bodies, which are then transported to Baffin Bay, providing crucial support for primary production and nitrogen fixation in the region and beyond.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
T. Benaltabet, G. Lapid, A. Torfstein
Summary: Trace metals delivered by atmospheric dust play a key role in oceanic biogeochemical cycles. However, the impact of short-term environmental perturbations such as dust storms and sediment resuspension events on the oceanic water column is poorly constrained. This study presents observations from the Gulf of Aqaba over a 2-year period, showing that increasing aerosol loads lead to a decrease in upper mixed layer trace metal inventories. Dust storms and sediment resuspension events promote trace metal scavenging and clearing.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Geochemistry & Geophysics
David J. Janssen, Delphine Gilliard, Joerg Rickli, Philipp Nasemann, Andrea Koschinsky, Christel S. Hassler, Andrew R. Bowie, Michael J. Ellwood, Charlotte Kleint, Samuel L. Jaccard
Summary: Research has focused on the cycling of chromium in the ocean, specifically the influence of deep waters and sediment on the distribution of chromium. The study also examines the potential impact of hydrothermal vents on chromium cycling. The findings suggest that changes in other factors, such as widespread anoxia, may contribute to variations in chromium isotope composition in the paleorecord.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Oceanography
Simon Barbot, Marion Lagarde, Florent Lyard, Patrick Marsaleix, Pascale Lherminier, Catherine Jeandel
Summary: This study provides new insights into the interpretation of GEOVIDE particle measurements, identifying potential resuspension sites caused by internal tides along the western Iberian shelf slope. The study uses a regional model and reanalysis method to determine the transport pathways for particles from the resuspension sites to the GEOVIDE stations. It highlights the importance of using a numerical tidal model to accurately identify resuspension sites, as the commonly used bathymetry slope method is not sufficient.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geochemistry & Geophysics
Brian A. Haley, Yingzhe Wu, Jesse M. Muratli, Chandranath Basak, Leopoldo D. Pena, Steven L. Goldstein
Summary: Data on dissolved rare earth elements and neodymium isotopes in the Eastern Equatorial Pacific were compared with other data to evaluate current geochemical theories, revealing inconsistencies and suggesting non-conservative components may be at play in the water column.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Anya V. Hess, Alexandra Auderset, Yair Rosenthal, Kenneth G. Miller, Xiaoli Zhou, Daniel M. Sigman, Alfredo Martinez-Garcia
Summary: The oxygen content of the oceans has declined due to climate change, especially in oxygen-deficient zones. Climate warming simulations predict the expansion of these zones until at least 2100. The response of ocean oxygenation on longer timescales remains uncertain.
Article
Environmental Sciences
Qiang Ma, Yusheng Qiu, Run Zhang, E. Lv, Yipu Huang, Min Chen
Summary: The study aimed to reveal small-scale particle dynamics in the eastern tropical North Pacific through Po-210/Pb-210 disequilibrium. Results showed significant deficiency of total Po-210 in oligotrophic seas and fractionation between dissolved and particulate Po-210 and Pb-210 in the scavenging process.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Daniel J. Nowacki, Andrew W. Stevens, Renee K. Takesue, Eric E. Grossman
Summary: The sequence and timing of sediment delivery and redistribution in coastal systems is crucial for shoreline stability, ecosystem services, and remediation planning. This study explores the sediment dynamics and the coupling between fluvial and oceanographic processes in Bellingham Bay, an urban estuary in Washington, USA, using multiple time-scale observations. The findings provide important insights for understanding the fate of contaminants, predicting long-term delta morphological evolution, and informing coastal restoration efforts.
ESTUARIES AND COASTS
(2023)
Article
Multidisciplinary Sciences
Dan Fu, Ping Chang, Christina M. Patricola, R. Saravanan, Xue Liu, Hylke E. Beck
Summary: The Central American mountains play a role in reducing tropical cyclone activity in the eastern North Pacific by interrupting moisture transport from the Caribbean Sea on a seasonal timescale, reducing TC activity by up to 35%.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Analytical
Bowen Li, Yonggang Jia, Zhihan Fan, Kai Li, Xuefa Shi
Summary: This study uses a device integrated with multiple sensors to simulate the disturbance process of deep-sea polymetallic nodule mining on seabed sediments. The mining process has a significant impact on the turbidity, density, and dissolved oxygen content of the water, affecting the local ecological environment. It is suggested to adopt suction and ore separation technology on mining ships to minimize the environmental impact.
Article
Geography, Physical
Jianbo Ren, Fan Xu, Qing He, Jian Shen, Leicheng Guo, Weiming Xie, Lei Zhu
Summary: This study investigates the sediment resuspension and morphological changes over the subaqueous delta front in the Changjiang Estuary using in-situ observation and numerical simulation methods. The findings suggest that remote tropical cyclone events play a significant role in sediment suspension and short-term morphological changes in the study area.
Article
Geosciences, Multidisciplinary
Yi Liu, Ziguang Li, Xiaopei Lin, Jun-Chao Yang
Summary: The study suggests that under greenhouse warming, the connection between El Nino and the tropical North Atlantic will strengthen, leading to an increase in anomalous warming/cooling and related weather extremes in the future.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Limnology
Natalya Evans, Juliana Tichota, James W. Moffett, Allan H. Devol
Summary: Nitrite is a crucial intermediate in the ocean's fixed nitrogen loss and accumulates in Oxygen Deficient Zones (ODZs). Recent research has found significant reoxidation of nitrite back to nitrate, impacting the global nitrogen cycle. Analysis of basin-scale data reveals extensive nitrite reoxidation across the Eastern Tropical North Pacific (ETNP) ODZ. The study also highlights metabolic switching points and high spatiotemporal variability in nitrite reoxidation. This analysis provides valuable insights into the recycling of fixed nitrogen in the ETNP.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Multidisciplinary Sciences
Tianyi Huang, Simone B. Moos, Edward A. Boyle
Summary: Research findings in the eastern tropical North Pacific (ETNP) oxygen-deficient zone (ODZ) support theoretical and experimental studies predicting that lighter chromium is preferentially reduced in low-oxygen environments and residual dissolved chromium becomes heavier due to removal of particl-reactive Cr(III) on sinking particles. Microbial activity, dependent on sinking organic matter flux, may be the dominant mechanism for chromium transformation, rather than a simple inorganic chemical conversion.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Michael H. Ihde, Joshua Tropp, Miguel Diaz, Alan M. Shiller, Jason D. Azoulay, Marco Bonizzoni
Summary: Metal cations are potent environmental pollutants, and their simultaneous detection and discrimination at sub-nanomolar concentrations in complex analytical matrices remain a major challenge. In this study, highly emissive conjugated polyelectrolytes functionalized with metal chelates were developed for the detection and differentiation of nine divalent metal cations. These sensors exhibited unprecedented sensitivity and improved differentiation, making them highly useful for environmental and biological applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Environmental Sciences
Shaily Rahman, Alan M. Shiller, Robert F. Anderson, Matthew A. Charette, Christopher T. Hayes, Melissa Gilbert, Karen R. Grissom, Phoebe J. Lam, Daniel C. Ohnemus, Frank J. Pavia, Benjamin S. Twining, Sebastian M. Vivancos
Summary: Processes controlling dissolved barium concentrations were investigated along two transects in the North Atlantic and Eastern Tropical Pacific. Conservative mixing and nonconservative processes were found to contribute to the variability of dissolved barium. Particulate excess barium formation and dissolution rates showed subsurface maxima, and the burial efficiency of particulate excess barium did not seem to depend on barite saturation indices. Revising river and shelf barium inputs may help balance the marine barium isotope budget.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Chemistry, Analytical
Shuo-En Wu, Alan Shiller, Andrew Barnard, Jason D. Azoulay, Tse Nga Ng
Summary: This study demonstrates a compact microfluidic device that removes interfering chloride ions through electrochemical desalination to improve the detection limit of a nitrate sensor. The device has been fabricated using a low-cost approach and has achieved high sensitivity.
Article
Oceanography
Christopher T. Hayes, Alan M. Shiner, Scott P. Milroy
Summary: This study compares the dissolved Th-232 fluxes in the Gulf of Mexico and the North Atlantic and places an upper limit on the contribution of North African dust to Th-232 and Fe in the Gulf of Mexico, which is about 30% of the total input. The study also suggests that shelf sources in the Gulf of Mexico, including rivers, submarine groundwater discharge, and benthic sedimentary releases, may be as important as or even more important than dust in the budget of lithogenic metals. Additionally, the estimated Fe input in the Gulf of Mexico implies a residence time of less than 6 months, similar to that in the North Atlantic.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Laura M. Whitmore, Alan M. Shiller, Tristan J. Horner, Yang Xiang, Maureen E. Auro, Dorothea Bauch, Frank Dehairs, Phoebe J. Lam, Jingxuan Li, Maria T. Maldonado, Chantal Mears, Robert Newton, Angelica Pasqualini, Helene Planquette, Robert Rember, Helmuth Thomas
Summary: This study investigates the distribution of barium (Ba) in the Arctic Ocean and finds that margins are a substantial source of Ba to the water column. Nonconservative inputs account for about 50% of the Ba inventory in the upper 500 m of the Arctic water column. The study also identifies the mixing of Arctic Ocean-derived waters and Baffin Bay-derived waters in the Canadian Arctic Archipelago.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Alessandro Tagliabue, Andrew R. Bowie, Thomas Holmes, Pauline Latour, Pier van der Merwe, Melanie Gault-Ringold, Kathrin Wuttig, Joseph A. Resing
Summary: Hydrothermal iron supply plays an important role in the Southern Ocean carbon cycle. The magnitude of its impact on export production depends on the estimation method used, with inverse helium modelling leading to a significant reduction. However, the observed anomalies and correlation with observations suggest that the spreading rate input scheme is more accurate.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
L. Surya Prakash, P. John Kurian, J. A. Resing, U. Tsunogai, A. Srinivas Rao, K. Sen, J. E. Lupton, T. Baumberger, A. Prajith, P. Roy
Summary: A new ultramafic/gabbroic-hosted hydrothermal vent field was discovered on the southern Central Indian Ridge through water column physico-chemical studies. The vent field showed characteristics such as high turbidity, elevated concentrations of dissolved Mn, dissolved Fe, and methane, and elevated delta He-3 values.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Environmental Sciences
Chris M. Marsay, William M. Landing, Devon Umstead, Claire P. Till, Robert Freiberger, Jessica N. Fitzsimmons, Nathan T. Lanning, Alan M. Shiller, Mariko Hatta, Rebecca Chmiel, Mak Saito, Clifton S. Buck
Summary: Atmospheric deposition is a major source of micronutrient trace elements in the surface ocean. This study assesses the contribution of sea spray aerosol (SSA) to aerosol trace element loading, finding that only vanadium has a significant SSA contribution. The study highlights the limitations in measuring trace elements in SSA and the potential for overestimating new trace element inputs from atmospheric deposition.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Geochemistry & Geophysics
Hu Wang, Wenpeng Wang, Meitong Liu, Huaiyang Zhou, Michael J. Ellwood, David A. Butterfield, Nathaniel J. Buck, Joseph A. Resing
Summary: Deep-sea hydrothermal venting is an important source of dissolved iron to the oceans. This study investigates the evolution of Fe isotopes in hydrothermal plumes, finding that the variation in plumes is related to the loss of particulate Fe-sulfides or Fe-oxyhydroxides, and the δ(56)dFe compositions in plumes increase during dispersal/dilution. The data demonstrate how Fe isotopes are transformed within a hydrothermal plume above arc volcanoes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Limnology
Allison M. Savoie, Amy Moody, Melissa Gilbert, Kevin S. Dillon, Stephan D. Howden, Alan M. Shiller, Christopher T. Hayes
Summary: Coastal ecosystems in the Mississippi Sound are vulnerable to ocean acidification, and this research examines the influence of local rivers on coastal acidification through monitoring dissolved inorganic carbon (DIC) and total alkalinity (TA). The opening of the Bonnet Cane Spillway, as well as hypoxia and increased CO2 concentrations in subsurface waters, contribute to low aragonite saturation states in the area despite an increase in TA. This study suggests that increased freshwater discharge from the Mississippi River may become the new normal in the spring and summer months, posing a threat to oyster stocks and the resilience of coastal ecosystems to acidification.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Oceanography
P. N. Sedwick, B. M. Sohst, C. O'Hara, S. E. Stammerjohn, B. Loose, M. S. Dinniman, N. J. Buck, J. A. Resing, S. F. Ackley
Summary: This study investigates the vertical resupply of dissolved iron (DFe) in the Ross Sea shelf and its impact on water-column DFe distributions. The results show that the major source of DFe comes from the benthos during winter months when katabatic winds drive sea ice formation. The study also suggests that the vertical resupply of DFe mainly occurs during mid-late winter and is sensitive to changes in the timing and extent of sea ice production.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Alessandro Tagliabue, Alastair J. M. Lough, Clement Vic, Vassil Roussenov, Jonathan Gula, Maeve C. Lohan, Joseph A. Resing, Richard G. Williams
Summary: The dispersal of dissolved iron from hydrothermal vents in the Trans-Atlantic-Geotraverse system is mainly controlled by physical processes and occurs predominantly in the colloidal phase. Fine-scale mixing near the seafloor and transport through fracture zones play important roles in the dispersal, leading to predominant westward dispersal away from the Mid-Atlantic ridge at a larger scale, while diapycnal mixing drives northward transport within the ridge axial valley. Coarse resolution ocean models often used to assess ocean iron cycling are not able to accurately reproduce the observed dispersal due to the omission of local topography and mixing.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Limnology
Susanna M. Michael, John Crusius, Andrew W. Schroth, Robert Campbell, Joseph A. Resing
Summary: This study investigates the seasonality of aluminum (Al) and manganese (Mn) sources in the Gulf of Alaska coastal region. It finds that sediment resuspension plays a significant role in delivering trace metals during the pre-stratification period, while meltwater becomes a major source of Al and Mn during spring and summer. The behavior of dissolved and particulate trace metals in coastal waters is controlled by different physical mechanisms.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Ecology
Alastair J. M. Lough, Alessandro Tagliabue, Clement Demasy, Joseph A. Resing, Travis Mellett, Neil J. Wyatt, Maeve C. Lohan
Summary: The supply of iron to the surface ocean affects primary productivity, but the extent of iron input from hydrothermal sources in the deep ocean is poorly understood. This study examines the variability in dissolved iron to excess helium ratios at four hydrothermal vent sites along the Mid-Atlantic Ridge. The results show that the ratios differ due to differences in plume age, and the presence of particulates affects the ratio within a certain distance from the vents. The study highlights the need for further research on vent sources and their impact on iron flux in the deep ocean.
Article
Chemistry, Multidisciplinary
Shuo-En Wu, Napasorn Phongphaew, Yichen Zhai, Lulu Yao, Hsun-Hao Hsu, Alan Shiller, Jason D. Azoulay, Tse Nga Ng
Summary: This study presents a new sensor tag for marine species that allows non-intrusive monitoring of the impacts of environmental changes on their behaviors and well-being, specifically focusing on the effects of dissolved oxygen and salinity on bivalve gape movement. The sensors, fabricated using low-cost techniques, offer an economical and convenient platform for aquaculture studies.
Article
Oceanography
Pernille Tonnesen, Shane Gero
Summary: Studying the behavior of deep-sea animals is challenging, but animal-borne camera tags may help understand predator-prey interactions. Research showed that camera-associated white light may affect foraging behavior, but has minimal long-term fitness impact on sperm whales. However, this impact should be considered and monitored for longer camera tag deployments.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2024)
Article
Oceanography
Sarah N. de Mendonca, Anna Metaxas
Summary: Ecological processes impact spatial patterns in abundance and distribution of megafauna. This study used spatial statistics to identify significant megafaunal patterns in the Laurentian Channel Marine Protected Area. The patterns varied among taxa and were related to geological factors. The study highlights the importance of considering fine-scale patterns and provides insights for ecological research, monitoring, and conservation in deep-sea ecosystems.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2024)