Article
Geochemistry & Geophysics
Wen-Hsuan Liao, Helene Planquette, Brivaela Moriceau, Christophe Lambert, Floriane Desprez de Gesincourt, Emmanuel Laurenceau-Cornec, Geraldine Sarthou, Thomas Gorgues
Summary: Sediments are usually considered to have limited influence on the dissolved iron (dFe) pool in the ocean, but recent observations and experiments suggest that iron released from suspended sediment particles can fertilize large areas of the ocean. In this study, dissolution experiments were conducted to measure the amount of dFe released from two types of resuspended sediments (silicate and calcite-rich) at different temperatures. The results showed that temperature influenced the dissolution of iron, but not manganese. Scavenging of iron and complexation with ligands were found to be important factors in both the release and fractionation of iron isotopes at the sediment-water boundary.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Oceanography
Emma J. Bullock, Lauren Kipp, Willard Moore, Kristina Brown, Paul J. Mann, Jorien E. Vonk, Nikita Zimov, Matthew A. Charette
Summary: This study quantifies the river radium inputs into the Arctic Ocean for the first time and improves the estimates for this region. Through lab experiments and data from major rivers around the world, it is found that rivers are an important source of radium to the Arctic Ocean. Understanding river radium inputs is crucial for studying changes in biogeochemically important element fluxes as climate change and Arctic warming continue.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Chris M. Marsay, David Kadko, William M. Landing, Clifton S. Buck
Summary: Atmospheric deposition of aerosols transported from the continents plays a significant role in supplying nutrient and pollutant trace elements to the surface ocean. This study focused on analyzing aerosol samples collected over the North Pacific and equatorial Pacific during the low dust season. The results showed higher enrichment factors of trace elements in equatorial Pacific aerosols compared to North Pacific aerosols, and higher bulk deposition velocities within the Intertropical Convergence Zone due to intense rainfall scavenging.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Engineering, Environmental
Douglas R. Tait, Isaac R. Santos, Sebastien Lamontagne, James Z. Sippo, Ashley Mcmahon, Luke C. Jeffrey, Damien T. Maher
Summary: Rivers are not the only source of nutrients for the Great Barrier Reef; submarine groundwater discharge also plays a significant role. However, internal recycling processes still dominate the nutrient budget, suggesting the need for a shift in management focus to protect the reef from excess nutrients.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Te Liu, Mark J. Hopwood, Stephan Krisch, Lucia H. Vieira, Eric P. Achterberg
Summary: Wet deposition is identified as an additional source of trace metals (TMs) to the Congo plume, supplementing the TM input from the Congo River. The study shows the significant contribution of wet deposition to the TM fluxes in the Congo plume, including Cd, Cu, Pb, and Zn.
GEOPHYSICAL RESEARCH LETTERS
(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
Environmental Sciences
Paola Gravina, Bartolomeo Sebastiani, Federica Bruschi, Chiara Petroselli, Beatrice Moroni, Roberta Selvaggi, Enzo Goretti, Matteo Pallottini, Alessandro Ludovisi, David Cappelletti
Summary: This study investigates anthropogenic contamination in Trasimeno lake in Central Italy and quantifies the level of contaminant enrichment. By analyzing sediment cores, a geochemical baseline for the lake was established to determine trace element enrichment factors. The study identified five groups of elements, one natural and four anthropogenic, and revealed the impact of industrial activities during World War II and recent human activities on the lake.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(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
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
Environmental Sciences
Qiaona Guo, Yue Zhao, Mengjun Li, Jinhui Liu
Summary: The accurate assessment of submarine groundwater discharge (SGD) and its associated nutrient fluxes is crucial for water resources management and ecological environment protection in coastal areas. This study investigated the distribution of Ra-224/Ra-223 activity ratio and its influencing factors in eastern Liaodong Bay, China. The results showed that the activity of radium was influenced by water quality and geochemical factors. Furthermore, the analysis of nutrient fluxes carried by the SGD revealed its significant impact on the ecological environment.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Gabriel Ricardo Cifuentes, Juan Jimenez-Millan, Claudia Patricia Quevedo, Antonio Galvez, Jose Castellanos-Rozo, Rosario Jimenez-Espinosa
Summary: The study explored the relationship between trace element concentration in sediments from Sochagota Lake and organic matter content, mineral composition, and bacterial communities activity. Different regions of the lake showed distinct characteristics in terms of element enrichment, suggesting the possible influence of sulfate-reducing bacteria in the precipitation of hydrothermal S and accumulation of trace elements. Additionally, sulfur-oxidizing bacterial communities may play a role in oxidizing previously precipitated sulfide and releasing metals.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Ali A. Al-Hashem, Aaron J. Beck, Stephan Krisch, Jan-Lukas Menzel Barraqueta, Tim Steffens, Eric P. Achterberg
Summary: In this study, the distributions of labile and refractory particulate trace metals were investigated along the southwest African shelf. The study inferred particle sources and biogeochemical cycling processes using proxies and elemental ratios. The findings suggest that different plankton groups have different particulate metal labilities.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
B. Rogalla, S. E. Allen, M. Colombo, P. G. Myers, K. J. Orians
Summary: Climate change is causing rising temperatures and an acceleration of the hydrological cycle, leading to increased river discharge and resulting in permafrost thaw, glacial melt, and a shift to a groundwater-dominated system in the Arctic. These changes impact the distribution of nutrients and biogeochemical constituents in the coastal regions of the Arctic Ocean. This study investigates the effects of terrestrial runoff on marine biogeochemistry in the Canadian Arctic Archipelago, using ocean modeling experiments to explore the transport and modification of waters from the Arctic Ocean to the North Atlantic. The findings highlight the influence of continental and glacial runoff on the geochemical composition of the marine environment, and the potential impacts on the marine ecosystem.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Geochemistry & Geophysics
Adhipa Herlambang, Cedric M. John
Summary: This study investigates the influence of precipitation rates on the fractionation of clumped isotopes between natural carbonates and their environmental solutions. Results suggest potential kinetic fractionation in ancient natural samples, leading to clumped isotope temperatures higher than environmental temperatures. The combination of clumped isotopes and trace elements approach reveals isotopic disequilibrium independent of the calculated temperature, demonstrating a critical step for future applications of the clumped isotope proxy to natural systems.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Geochemistry & Geophysics
Pei Xin, Alicia Wilson, Chengji Shen, Zhenming Ge, Kevan B. Moffett, Isaac R. Santos, Xiaogang Chen, Xinghua Xu, Yvonne Y. Y. Yau, Willard Moore, Ling Li, D. A. Barry
Summary: Salt marshes are important ecosystems that provide essential ecological services, but they have been lost globally due to human activities and climate change. The interactions between tidal water and groundwater in salt marshes affect plant growth and biogeochemical exchange with coastal water. However, there are still significant knowledge gaps regarding the hydrological and ecological links in salt marshes and the challenges they face.
REVIEWS OF GEOPHYSICS
(2022)
Article
Limnology
Morgane Leon, Pieter van Beek, Jan Scholten, Willard S. Moore, Marc Souhaut, Joselene De Oliveira, Catherine Jeandel, Patrick Seyler, Julien Jouanno
Summary: The study investigates the release of radium isotopes when rivers mix into the ocean and analyzes their activities. The residence time of Amazon waters on the Brazilian continental shelf is found to be primarily driven by the surrounding currents, independent of the discharge rate of the Amazon River.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Correction
Chemistry, Multidisciplinary
Lauren E. Kipp, Matthew A. Charette, Douglas E. Hammond, Willard S. Moore
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
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
Chemistry, Multidisciplinary
Nathaniel Kemnitz, Douglas E. Hammond, Paul Henderson, Emilie Le Roy, Matthew Charette, Willard Moore, Robert F. Anderson, Martin Q. Fleisher, Anne Leal, Erin Black, Christopher T. Hayes, Jess Adkins, William Berelson, Xiaopeng Bian
Summary: In August 2017, five sediment cores were collected along a cruise tract from Hawaii to Alaska to study the behavior and fluxes of Ac-227, Ra-228, and Ra-226. The study found that the sediment fluxes of Ac-227 and Ra-228 are relatively large in the Northeast Pacific. However, the sediment flux of Ra-226 is relatively small in this region, indicating the significant lateral export of Ra-226 from the North Pacific.
Article
Oceanography
Emma J. Bullock, Lauren Kipp, Willard Moore, Kristina Brown, Paul J. Mann, Jorien E. Vonk, Nikita Zimov, Matthew A. Charette
Summary: This study quantifies the river radium inputs into the Arctic Ocean for the first time and improves the estimates for this region. Through lab experiments and data from major rivers around the world, it is found that rivers are an important source of radium to the Arctic Ocean. Understanding river radium inputs is crucial for studying changes in biogeochemically important element fluxes as climate change and Arctic warming continue.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(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
Willard S. Moore, Jacob Vincent, James L. Pickney, Alicia M. Wilson
Summary: This study reveals that submarine groundwater discharge (SGD) can directly affect the dissolved oxygen (DO) content in coastal bottom waters. The researchers developed a prediction model that linked episodes of enhanced SGD to upwelling-favorable winds. The data showed that these water masses had higher Ra-226 and Ra-228 values compared to typical bottom water, and were significantly depleted in DO. The successful prediction using wind data represents a major advancement in quantifying SGD in the region.
GEOPHYSICAL RESEARCH LETTERS
(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
Geosciences, Multidisciplinary
P. N. Sedwick, B. M. Sohst, K. N. Buck, S. Caprara, R. J. Johnson, D. C. Ohnemus, L. E. Sofen, A. Tagliabue, B. S. Twining, T. E. Williams
Summary: Constraining the role of dust deposition in regulating the concentration of iron in surface ocean waters requires understanding the flux of seawater-soluble iron in aerosols and the replacement time of dissolved iron in the euphotic zone. This study estimates these quantities using DFe data from the Bermuda Atlantic Time-series Study region and measurements of iron in aerosols and rain from Bermuda in 2019. The results suggest a seasonal variation in surface DFe concentrations and a mean euphotic-zone residence time of 0.8-1.9 years for DFe with respect to aeolian input.
GEOPHYSICAL RESEARCH LETTERS
(2023)
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
Morgane Leon, Pieter van Beek, Virginie Sanial, Marc Souhaut, Paul Henderson, Matthew A. Charette
Summary: The analysis of radium and actinium isotopes in seawater requires the collection of large volumes of water and the use of high sensitivity instruments. To concentrate these isotopes, filters impregnated with MnO2 are typically used. However, the extraction efficiency of these filters for the target isotopes needs to be determined.