Article
Environmental Sciences
Zvi Steiner, William M. Landing, Madeleine S. Bohlin, Mervyn Greaves, Satya Prakash, P. N. Vinayachandran, Eric P. Achterberg
Summary: Lithium concentrations in the ocean are closely related to the inorganic silicate cycle and carbon cycle. The residence time of lithium may be shorter than previously estimated.
GLOBAL BIOGEOCHEMICAL CYCLES
(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
Elise S. Droste, Alex R. Baker, Chan Yodle, Andrew Smith, Laurens Ganzeveld
Summary: Iodine plays a significant role in the radiative budget and oxidative capacity of the atmosphere, with a portion of it ending up in aerosols where it contributes to the destruction of ozone. Research on aerosol samples collected from various ocean regions showed a consistent proportion of different iodine species, with iodate reduction attributed to aerosol acidity and anthropogenic emissions. The data contributes to the understanding of aerosol iodine speciation and the complex composition of organic iodine in aerosols.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Srinivas Bikkina, Arvind Shukla, Sunil Kumar Singh, Damodaraorao Karri, Naman Deep Singh, Bisweswar Sahoo
Summary: This study investigates the isotopic composition of dust samples collected over the Arabian Sea, revealing significant spatial variability in 87Sr/86Sr and epsilon Nd(0). Dust storms originating from the Arabian Peninsula and Iran/Indo-Gangetic Plain are identified using air mass back trajectories and satellite imagery. The findings highlight the need for more research and measurements on the impact of dust outbreaks on the marine ecosystem.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Hairong Xu, Thomas Weber
Summary: This study used a data-assimilation model of the oceanic aluminum cycle to uncover factors such as atmospheric aluminum supply, solubility variations, and deep-sea vertical distribution. The research found the global annual addition of soluble aluminum to the ocean and the aluminum injected from hydrothermal vents, as well as highlighting that aluminum distribution is primarily controlled by abiotic reversible scavenging.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Geosciences, Multidisciplinary
Samuel C. Mogen, Nicole S. Lovenduski, Allysa R. Dallmann, Luke Gregor, Adrienne J. Sutton, Steven J. Bograd, Nathali Cordero Quiros, Emanuele Di Lorenzo, Elliott L. Hazen, Michael G. Jacox, Mercedes Pozo Buil, Stephen Yeager
Summary: This study characterizes the biogeochemical properties of the Eastern North Pacific upper ocean during the Winter of 2013-2014 using observations and models, and finds that the Blob is associated with increased aragonite saturation and decreased oxygen concentration.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Linjie Zheng, Tomoharu Minami, Shotaro Takano, Yoshiki Sohrin
Summary: This study investigates the distribution of aluminum, manganese, cobalt, and lead in the western South Pacific, revealing their unique characteristics and sources. The distribution of aluminum is influenced by land weathering, while lead is mainly supplied by anthropogenic aerosols from Asia and Russia. These findings have significant implications for understanding the biogeochemical processes of these elements in the Pacific Ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Environmental Sciences
Rintaro Moriyasu, Seth G. John, Xiaopeng Bian, Shun-Chung Yang, James W. Moffett
Summary: The chemistry of copper in seawater is dominated by complexation with organic ligands. Recent studies show that only a small fraction of dissolved copper exists as labile complexes, while the majority is inert and does not participate in coordination exchange reactions. The accumulation of labile copper is observed in surface waters and near deep sea sediments, with important implications for copper transport and biological availability.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Multidisciplinary Sciences
Nathan T. Lanning, Shuo Jiang, Vinicius J. Amaral, Katherine Mateos, Janelle M. Steffen, Phoebe J. Lam, Edward A. Boyle, Jessica N. Fitzsimmons
Summary: Reversible scavenging is the process by which dissolved metals exchange onto and off sinking particles and are transported to deeper depths. This process deepens the distribution of adsorptive elements and shortens their residence times in the ocean. Understanding which metals undergo reversible scavenging and under what conditions is important.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Environmental Sciences
Ziran Wei, J. Kirk Cochran, Evan Horowitz, Patrick Fitzgerald, Christina Heilbrun, David Kadko, Mark Stephens, Chris M. Marsay, Clifton S. Buck, William M. Landing
Summary: Deposition of aerosols to the surface ocean is an important factor affecting primary production in the surface ocean. This study collected data on aerosol Pb-210, Po-210, and Be-7 fluxes during a research cruise in the Pacific Ocean. The results showed that Pb-210 fluxes were low near the Alaskan margin, increased at around 43 degrees N, and then decreased. The study also found good agreement between Pb-210 fluxes and long-term land-based fluxes, as well as data from another research cruise in the East Pacific Ocean.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Meteorology & Atmospheric Sciences
Zhen Lv, Jun-Chao Yang, Xiaopei Lin, Yu Zhang
Summary: This study suggests that the North Atlantic forcing plays a more significant role than the tropical Pacific forcing in the decadal prediction of sea surface temperature (SST) variability in the North Pacific. By removing the North Atlantic forcing, the prediction skill of NP SST decreases, indicating its strong contribution to the long-term prediction. The research emphasizes the need for improving the simulation of the Atlantic trans-basin effect for better predicting NP climate.
JOURNAL OF CLIMATE
(2022)
Review
Geochemistry & Geophysics
Jessica N. Fitzsimmons, Tim M. Conway
Summary: The micronutrient iron is crucial in determining the primary production in the global ocean. Understanding the sources, sinks, and internal cycling processes of iron is essential to comprehend its role in the global carbon cycle and climate change. Iron isotopic analysis in seawater has proved to be an effective tool in identifying iron sources and studying biogeochemical processes. This review provides a summary of the different iron source fluxes and their isotopic signatures, as well as the potential of iron isotopes in studying internal oceanic cycling of iron.
ANNUAL REVIEW OF MARINE SCIENCE
(2023)
Article
Environmental Sciences
Wenhao Wang, Heather Goring-Harford, Korinna Kunde, E. Malcolm S. Woodward, Maeve C. Lohan, Douglas P. Connelly, Rachael H. James
Summary: Chromium isotopic composition in ancient marine sediments can be used to infer changes in past seawater oxygenation or biological productivity. The relative contribution of external sources and internal cycling on the distribution of dissolved chromium in the oceans is still debated. In this study, water column profiles were obtained for dissolved chromium concentrations and chromium isotopes in the sub-tropical North Atlantic. The results suggest that benthic inputs and the formation of colloid aggregates of Fe-(oxyhydr)oxides play important roles in shaping the distribution of chromium.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geochemistry & Geophysics
Shuo Jiang, Jing Zhang, Hui Zhou, Yun Xue, Wei Zheng
Summary: Clean seawater samples were collected during a 2016 cruise to develop the first high-quality dataset of total dissolvable Pb concentration ([TDPb]) in the upper 750 m of the low-latitude Northwestern Pacific Ocean (NWPO). The distribution of [TDPb] was influenced by the low-latitude NWPO current system, with significant maxima in regions such as the North Equatorial Current (NEC) and the Kuroshio Current (KC). The study also highlighted the lateral transport of Pb in different currents in the NWPO.
Article
Geosciences, Multidisciplinary
Qiang Zhang, Qingsong Liu, Andrew P. Roberts, Jimin Yu, Yan Liu, Jinhua Li
Summary: The study demonstrates that Asian dust delivered iron to stimulate primary productivity and boost magnetotactic bacteria biomineralization in the late Miocene in the North Pacific Ocean. However, since the late Pliocene, dust inputs and primary productivity appear to have been decoupled, with magnetotactic bacteria activity mainly controlled by primary productivity.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Frank J. Pavia, Robert F. Anderson, Paulina Pinedo-Gonzalez, Martin Q. Fleisher, Mark A. Brzezinski, Rebecca S. Robinson
GLOBAL BIOGEOCHEMICAL CYCLES
(2020)
Article
Multidisciplinary Sciences
Jordan T. Abell, Gisela Winckler, Robert F. Anderson, Timothy D. Herbert
Summary: The prevailing mid-latitude westerly winds, known as the westerlies, are migrating polewards in response to anthropogenic forcing. Reconstructing the westerlies during past warm periods can help understand changes in the position and strength of these wind systems as the climate continues to warm.
Article
Chemistry, Analytical
Paulina Pinedo-Gonzalez, Robert F. Anderson, Sebastian M. Vivancos, Frank J. Pavia, Martin Q. Fleisher
Summary: The article introduces a new method for determining the concentrations of Th-232, Th-230, and Pa-231 in seawater, with high extraction efficiency and low procedural blank values, suitable for low-concentration seawater samples. The data obtained have high precision, allowing for reliable measurement of Th and Pa in the oceans.
Article
Environmental Sciences
Christopher T. Hayes, Kassandra M. Costa, Robert F. Anderson, Eva Calvo, Zanna Chase, Ludmila L. Demina, Jean-Claude Dutay, Christopher R. German, Lars-Eric Heimburger-Boavida, Samuel L. Jaccard, Allison Jacobel, Karen E. Kohfeld, Marina D. Kravchishina, Jorg Lippold, Figen Mekik, Lise Missiaen, Frank J. Pavia, Adina Paytan, Rut Pedrosa-Pamies, Mariia Petrova, Shaily Rahman, Laura F. Robinson, Matthieu Roy-Barman, Anna Sanchez-Vidal, Alan Shiller, Alessandro Tagliabue, Allyson C. Tessin, Marco van Hulten, Jing Zhang
Summary: The study used Th-230-normalized fluxes to create maps of deep-sea burial fluxes of components like calcium carbonate and biogenic opal, providing new quantitative estimates for deep-sea budgets. The sediment flux compilation offers detailed regional and global information to refine the understanding of sediment preservation.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Geochemistry & Geophysics
E. E. Rohde, C. T. Hayes, N. Redmond, S. K. Glasscock
Summary: Research has shown that records of authigenic uranium from the South Atlantic can be used to infer changes in deep-sea oxygenation and organic matter export over the past 0.5 million years. Findings suggest that there are differential responses of rhenium and uranium to oxygen changes, with evidence of some small-scale rhenium remobilization, potentially involving differences in molecular-level reduction mechanisms. Peaks in authigenic manganese coinciding with peaks in rhenium and uranium indicate increases in porewater oxygenation related to Antarctic Bottom Water circulation during the last interglacial period.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geosciences, Multidisciplinary
Frank J. Pavia, Shouyi Wang, Jennifer Middleton, Richard W. Murray, Robert F. Anderson
Summary: The text discusses the deep ocean as a reservoir for storing carbon dioxide removed from the atmosphere during Pleistocene glacial periods, as well as the enhanced efficiency of the biological pump in the deep ocean during glacial periods.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Environmental Sciences
Yang Xiang, Phoebe J. Lam, Adrian B. Burd, Christopher T. Hayes
Summary: This study investigates the controls on sinking velocity and mass flux by analyzing particle characteristics and size distribution data from three recent U.S. GEOTRACES cruises. The study finds that variations in particle concentration have a greater impact on mass flux than sinking velocity. Furthermore, the decomposition of different terms in a Stokes' Law model reveals the factors contributing to the lowest mass flux in the Western Arctic. The findings emphasize the importance of particle characteristics and size distribution for mass fluxes. Similar methods can be applied to improve our understanding of the biological pump in other regions.
GLOBAL BIOGEOCHEMICAL CYCLES
(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
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)
Review
Geochemistry & Geophysics
Madison Wood, Christopher T. Hayes, Adina Paytan
Summary: Constraining rates of marine carbonate burial through geologic time is critical for interpreting changes in ocean chemistry and understanding Earth's carbon cycle and climate feedbacks. The Quaternary Period is particularly interesting due to its variability in sea level, which impacts the global carbonate budget and atmospheric carbon dioxide. However, the quantification of these effects remains poor.
ANNUAL REVIEW OF MARINE SCIENCE
(2023)
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
Multidisciplinary Sciences
Danielle Schimmenti, Franco Marcantonio, Christopher T. Hayes, Jennifer Hertzberg, Matthew Schmidt, John Sarao
Summary: This study reveals that changes in nutrient availability, driven by the position of the Intertropical Convergence Zone and biogeochemical cycling and circulation in the Southern Ocean, have a significant impact on phytoplankton community structure during deglaciation.
SCIENTIFIC REPORTS
(2022)
Article
Geosciences, Multidisciplinary
J. Yu, R. F. Anderson, Z. D. Jin, X. Ji, D. J. R. Thornalley, L. Wu, N. Thouveny, Y. Cai, L. Tan, F. Zhang, L. Menviel, J. Tian, X. Xie, E. J. Rohling, J. F. McManus
Summary: Ice core measurements show diverse atmospheric CO2 variations during North Atlantic cold periods. This study reveals the impact of multiple ocean ventilation modes on deep-sea carbon storage and atmospheric CO2 changes, providing a comprehensive understanding of carbon cycle adjustments to climate change.
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
