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
Engineering, Chemical
Xinyu Zhu, Yang Huang, Yangge Zhu, Na Sun, Weiqing Wang
Summary: The selective inhibition mechanism of oxalic acid on common calcium-bearing gangue minerals in bastnaesite flotation was studied, showing that oxalic acid competes with H205 for the active site on the surface of the gangue minerals, reducing their surface hydrophobicity and inhibiting their floating. In this process, fluorite is more inhibited than calcite.
MINERALS ENGINEERING
(2021)
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
Multidisciplinary Sciences
Takahiro Hosono, Shunki Nakashima, Masahiro Tanoue, Kimpei Ichiyanagi
Summary: Eastern Asia is a significant contributor to global air pollution. This study provides a detailed understanding of the transportation and deposition of trace metals in the atmosphere in a hotspot region under monsoon climate conditions. The findings reveal that during winter, metals emitted through coal combustion are intensively deposited along the western coast of the Japanese archipelago due to heavy snowfall, resulting in excessive lead concentrations in precipitation.
SCIENTIFIC REPORTS
(2022)
Article
Green & Sustainable Science & Technology
Mazhar Ali Jarwar, Stefano Dumontet, Rosa Anna Nastro, M. Esther Sanz-Montero, Vincenzo Pasquale
Summary: Microbial induced calcite precipitation (MICP) is of great theoretical and practical significance, and has been widely used in fields such as oil recovery, soil improvement, and concrete healing. This study is the first attempt to conduct a bibliometric analysis on MICP research, showing a significant increase in the number of publications in recent years, with China leading in productivity.
Article
Meteorology & Atmospheric Sciences
Min Luo, Yuzhi Liu, Tianbin Shao
Summary: The study investigates the response of water-cycle over global drylands to global warming from 1980 to 2015, showing a weakened water-cycle characterized by increased evaporation, decreased precipitation and runoff, and a greater dependence of precipitation on local evaporation.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Engineering, Environmental
Yi Cheng, Ahmed S. Elrys, Abdel-Rahman M. Merwad, Huimin Zhang, Zhaoxiong Chen, Jinbo Zhang, Zucong Cai, Christoph Mueller
Summary: Dissimilatory nitrate reduction to ammonium (DNRA) is an important process in the terrestrial nitrogen cycle, which can protect nitrogen by converting nitrate into ammonium. A meta-analysis showed that DNRA rates were significantly higher in paddy soils compared to forests, grasslands, and unfertilized croplands. Soil DNRA was influenced by altitude, latitude, precipitation, temperature, pH, soil total carbon, and soil total nitrogen.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Madeleine Pascolini-Campbell, John T. Reager, Hrishikesh A. Chandanpurkar, Matthew Rodell
Summary: Global land evapotranspiration increased by 10% between 2003 and 2019, driven mainly by warming land temperatures. This increase has resulted in more land precipitation being partitioned into evapotranspiration rather than runoff. Observations also show that variability in global land evapotranspiration is positively correlated with the El Nino-Southern Oscillation.
Article
Environmental Sciences
Wengui Liang, Minghua Zhang
Summary: This study demonstrates the relationship between percentage change in precipitation and surface temperature change under global warming in East Asia. It shows that the scaling of precipitation with temperature is different in summer and winter, which can be attributed to the robust climate changes of moisture gradient, weakening westerly jets, and increasing hydrological amplitude of atmospheric eddies.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Meng Zuo, Wenmin Man, Tianjun Zhou
Summary: Both proxy data and climate modeling show divergent responses of global monsoon precipitation to volcanic eruptions. The reason lies in the background oceanic states, specifically in how El Nino-Southern Oscillation (ENSO) conditions affect the Pacific Ocean's post-eruption SST anomalies, leading to either El Nino-like or La Nina-like responses in precipitation patterns.
JOURNAL OF CLIMATE
(2021)
Article
Geochemistry & Geophysics
Roberta Parigi, Ning Chen, Joel W. Reid, Carol J. Ptacek, David W. Blowes
Summary: Experimental results presented in this paper show nickel isotope fractionation during the precipitation of nickel secondary minerals. This fractionation could provide useful indicators of nickel isotope fractionation associated with fast precipitation of secondary minerals involved in the sequestration of nickel from contaminated environments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Meteorology & Atmospheric Sciences
Cheng Tao, Shaocheng Xie, Shuaiqi Tang, Jiwoo Lee, Hsi-Yen Ma, Chengzhu Zhang, Wuyin Lin
Summary: Accurately simulating the diurnal cycle of precipitation is a challenge for current climate models. This study evaluates the diurnal cycles of summertime precipitation in different monsoon systems using 21 CMIP6 historical simulations. The simulations perform well over ocean and coastal ocean, but show larger biases over land and coastal land. There is improvement in the multi-model mean of CMIP6 historical and CMIP6 AMIP simulations compared to CMIP5 historical simulations. The influence of model resolution on the diurnal cycle varies across subregions, with significant improvement observed over coastal ocean.
Article
Multidisciplinary Sciences
Ziye Li, Yi Ge Zhang, Mark Torres, Benjamin J. W. Mills
Summary: The rate of organic carbon burial in marine sediment can be determined by using the mass balance between inorganic and organic carbon. However, this method is complicated and has uncertainties. In this study, a new approach was used to calculate the rate of organic carbon burial during the Neogene period, showing larger spatiotemporal variability than previously estimated. Suppressed organic carbon burial during the warm mid-Miocene suggests that the organic carbon cycle acted as a positive feedback of past global warming.
Article
Multidisciplinary Sciences
Felicia Chiang, Omid Mazdiyasni, Amir AghaKouchak
Summary: Most studies have focused on the impacts of human activity on mean or extreme climate variables and neglected exploring drought characteristics. The research demonstrates that human activity has increased the frequency, duration, and intensity of drought events globally.
NATURE COMMUNICATIONS
(2021)
Article
Geosciences, Multidisciplinary
Hsi-Yen Ma, Stephen A. Klein, Jiwoo Lee, Min-Seop Ahn, Cheng Tao, Peter J. Gleckler
Summary: This study investigates daily and sub-daily precipitation statistics from three global model ensembles. The results show that global storm-resolving models (GSRMs) perform better in statistics of heavier rain rate events, while high-resolution and standard-resolution models fail to accurately simulate the diurnal cycle and propagation of precipitation.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Wen Liang, Christine Peters, Lin Li, Olaf Leupold, Heping Li, Michael E. Boettcher
Summary: A new ordered double carbonate, BaFe(CO3)(2), was successfully synthesized for the first time under high pressure-temperature conditions. The stability, decomposition temperature, and formation kinetics of BaFe(CO3)(2) were compared with other carbonates, providing insights into the crystal structure and composition differences. The thermodynamic properties of the double carbonate were estimated and compared to natural aqueous solutions, contributing to a more comprehensive understanding of carbonate minerals in geology.
Article
Geology
Paul Enos, Elias Samankassou
Summary: The Lofer cyclothems of the Alpine Upper Triassic share many similarities with Holocene sediments of Florida Bay, including symmetrical cycles and similar depositional textures and structures. These similarities suggest that sedimentation patterns at a small scale may be independent of the global climate regime, providing important insights into the Triassic depositional environment and future evolution of modern environments.
Article
Geochemistry & Geophysics
Gibran Romero-Mujalli, Jens Hartmann, Takahiro Hosono, Pascale Louvat, Koki Okamura, Pierre Delmelle, Thorben Amann, Michael E. Boettcher
Summary: This study investigates the contribution of hydrothermal fluids to solute export in the Aso caldera, southern Japan, showing that they account for 67 to 91% of the total sulphate flux at the caldera outlet. The results highlight the significant influence of hydrothermal fluids on the sulphur budget, indicating a strong connection between volcanic activity and biogeochemical cycling.
Article
Chemistry, Physical
Michael Ernst Boettcher, Peer-Lennart Gehlken, Wen Liang
Summary: In this study, the mid-infrared spectra of a newly discovered double carbonate BaFe[CO3](2) were reported for the first time. The spectra were compared with other Ba-bearing double carbonates, showing a decrease in absorption band wavenumbers with substitution of smaller cations. The carbon isotope shift coefficient agreed with theoretical predictions.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Geosciences, Multidisciplinary
Sebastian Schaller, Michael E. Bottcher, Marius W. Buechi, Laura S. Epp, Stefano C. Fabbri, Natacha Gribenski, Ulrich Harms, Sebastian Krastel, Alina Liebezeit, Katja Lindhorst, Hanna Marxen, Ulli Raschke, David Schleheck, Iris Schmiedinger, Antje Schwalb, Hendrik Vogel, Martin Wessels, Flavio S. Anselmetti
Summary: Lake Constance's modern basin, which is over 250 m deep, represents the underfilled northern part of a glacially overdeepened trough that extends well into the Alps at its southern end. A seismic survey of the lake revealed a Quaternary sediment fill of over 150 m thickness, representing at least the last glacial cycle. This sediment fill consists of ice-contact deposits at the base, overlain by glaciolacustrine to lacustrine sediments.
SWISS JOURNAL OF GEOSCIENCES
(2022)
Article
Geochemistry & Geophysics
Bettina Schaefer, Lorenz Schwark, Michael E. Bottcher, Vann Smith, Marco J. L. Coolen, Kliti Grice
Summary: This study utilized biomarker and stable isotope data to analyze the depositional and environmental changes in the Chicxulub impact crater during the Early Eocene, and found elevated sea surface temperature and increasing organic matter content in the sediment sequence, potentially influenced by upwelling.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
E. M. O'Sullivan, T. F. Naegler, E. C. Turner, B. S. Kamber, M. G. Babechuk, S. P. O'Hare
Summary: This study investigates marine palaeoredox conditions in the mid-Neoproterozoic era. Analyzing samples from the Stone Knife Formation in NW Canada, the study reveals different isotope characteristics in different types of carbonates and shales, suggesting the influence of various factors in Mo pathway into microbial carbonates. The results indicate a relatively stable Mo oxic sink throughout the Proterozoic, shifting the apparent expansion of oxygen towards the younger boundary of the Neoproterozoic Oxygenation Event.
PRECAMBRIAN RESEARCH
(2022)
Article
Biochemical Research Methods
Michael Ernst Boettcher, Torsten W. Vennemann
Summary: The kinetic oxygen isotope fractionation during the reaction of natural and synthetic norsethite (BaMg(CO3)(2)) with orthophosphoric acid was examined for the first time. The results show a significant dependence on temperature. The fractionation factor for other double carbonates at 25 degrees C can be estimated based on the published results.
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2022)
Article
Geosciences, Multidisciplinary
R. Zammit, C. H. Lear, E. Samankassou, L. J. Lourens, A. Micallef, P. N. Pearson, O. M. Bialik
Summary: This article examines the alternating humid and arid intervals in North Africa during the Miocene, focusing on the impact of the restriction of the Mesopotamian Seaway and the global climate. It provides valuable insights into the regional hydroclimate and highlights the importance of tectonic forcing and ocean circulation patterns in the evolution of the West African Monsoon system.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2022)
Article
Multidisciplinary Sciences
Jeanne Armelle Bilobe, John Takem Eyong, Elias Samankassou
Summary: The Cretaceous and Neogene deposits in the Mamfe Basin were studied to understand their sediment source, environment, and tectonic regime. The results show that the sediments are immature and likely originated from nearby igneous and metamorphic rocks. The chemical and trace element analyses indicate low to moderate weathering and suggest an arid to semi-arid depositional environment. The geochemical proxies reveal a predominance of oxic conditions during deposition, but also episodic reducing conditions in the basin. Overall, this study provides valuable information about the sedimentary processes and paleoenvironment in the Mamfe Basin.
Article
Geosciences, Multidisciplinary
Manga Owona Gaspard William, Bessong Moise, Mioumnde Arthur Paterne, Mbesse Cecile Olive, Bapowa Laouna Carole, Kusi Micheline Michelle-Alexia Ngum, Meying Arsene, Ekomane Paulin Emile, Samankassou Elias
Summary: This paper focuses on the lithostratigraphy and the palaeoenvironmental evolutions of the Babouri-Figuil Basin depositional system. The study reveals that the basin's sedimentary formations were deposited in a lacustrine/fluvial/deltaic sedimentary environment, which were influenced by volcanic events and hydrothermal fluid circulation.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Ecology
Damian L. Arevalo-Martinez, Amir Haroon, Hermann W. Bange, Ercan Erkul, Marion Jegen, Nils Moosdorf, Jens Schneider von Deimling, Christian Berndt, Michael Ernst Boettcher, Jasper Hoffmann, Volker Liebetrau, Ulf Mallast, Gudrun Massmann, Aaron Micallef, Holly A. Michael, Hendrik Paasche, Wolfgang Rabbel, Isaac Santos, Jan Scholten, Katrin Schwalenberg, Beata Szymczycha, Ariel T. Thomas, Joonas J. Virtasalo, Hannelore Waska, Bradley A. Weymer
Summary: For thousands of years, humans have been attracted to coastlines for their resource potential and as geopolitical centers. The supply and demand of potable water are crucial for water security in coastal communities, but the interaction between freshwater and saltwater in coastal settings is complicated by natural and human-driven environmental changes. Understanding groundwater fluxes across the land-sea continuum is important for (bio)geochemical budgets and the potential use of offshore freshened groundwater as a resource. Assessing land-ocean connectivity through groundwater requires a multidisciplinary approach and is relevant for climate change, pollution, and sustainable development goals.
Article
Multidisciplinary Sciences
Tania L. Maxwell, Andre S. Rovai, Maria Fernanda Adame, Janine B. Adams, Jose Alvarez-Rogel, William E. N. Austin, Kim Beasy, Francesco Boscutti, Michael E. Boettcher, Tjeerd J. Bouma, Richard H. Bulmer, Annette Burden, Shannon A. Burke, Saritta Camacho, Doongar R. Chaudhary, Gail L. Chmura, Margareth Copertino, Grace M. Cott, Christopher Craft, John Day, Carmen B. de los Santos, Lionel Denis, Weixin Ding, Joanna C. Ellison, Carolyn J. Ewers Lewis, Luise Giani, Maria Gispert, Swanne Gontharet, Jose A. Gonzalez-Perez, M. Nazaret Gonzalez-Alcaraz, Connor Gorham, Anna Elizabeth L. Graversen, Anthony Grey, Roberta Guerra, Qiang He, James R. Holmquist, Alice R. Jones, Jose A. Juanes, Brian P. Kelleher, Karen E. Kohfeld, Dorte Krause-Jensen, Anna Lafratta, Paul S. Lavery, Edward A. Laws, Carmen Leiva-Duenas, Pei Sun Loh, Catherine E. Lovelock, Carolyn J. Lundquist, Peter Macreadie, Ines Mazarrasa, J. Patrick Megonigal, Joao M. Neto, Juliana Nogueira, Michael J. Osland, Jordi F. Pages, Nipuni Perera, Eva-Maria Pfeiffer, Thomas Pollmann, Jacqueline L. Raw, Maria Recio, Ana Carolina Ruiz-Fernandez, Sophie K. Russell, John M. Rybczyk, Marek Sammul, Christian Sanders, Rui Santos, Oscar Serrano, Matthias Siewert, Craig Smeaton, Zhaoliang Song, Carmen Trasar-Cepeda, Robert R. Twilley, Marijn Van de Broek, Stefano Vitti, Livia Vittori Antisari, Baptiste Voltz, Christy N. Wails, Raymond D. Ward, Melissa Ward, Jaxine Wolfe, Renmin Yang, Sebastian Zubrzycki, Emily Landis, Lindsey Smart, Mark Spalding, Thomas A. Worthington
Summary: Tidal marshes are significant carbon reservoirs, and a global dataset of soil organic carbon provides valuable information for researchers and policy-makers. The dataset includes geographic locations, soil depths, and organic carbon data, allowing for estimation of organic carbon stocks in tidal marsh soils.
Article
Ecology
Bryce Van Dam, Nele Lehmann, Mary A. Zeller, Andreas Neumann, Daniel Proefrock, Marko Lipka, Helmuth Thomas, Michael Ernst Boettcher
Summary: This study quantified the net sediment-water exchange of alkalinity using multiple methods and found that the sediment-water irrigation rates in the southern North Sea were higher than previously estimated. The net alkalinity fluxes in the Baltic Sea were relatively low, while carbonate mineral dissolution, precipitation, and sulfide re-oxidation appeared to play important roles in shaping net sediment-water fluxes in the North Sea and Baltic Sea.
Article
Ecology
Cordula Nina Gutekunst, Susanne Liebner, Anna-Kathrina Jenner, Klaus-Holger Knorr, Viktoria Unger, Franziska Koebsch, Erwin Don Racasa, Sizhong Yang, Michael Ernst Boettcher, Manon Janssen, Jens Kallmeyer, Denise Otto, Iris Schmiedinger, Lucas Winski, Gerald Jurasinski
Summary: This study investigated the effects of brackish water inflow on microbial communities and methane production-consumption dynamics in a freshwater rewetted fen. The results showed that the brackish water inflow and preceding drought increased sulfate availability but did not hinder methane production or increase methane consumption. Methane oxidation may occur in the water column or organic litter on the ground.
Article
Geochemistry & Geophysics
Zhen-Min Ge, Xiao-Long Huang, Wei Xie, Tobias W. Hofig, Fan Yang, Yang Yu, S. Khogenkumar Singh
Summary: The mantle source composition of the nascent oceanic crust in the central part of the Gulf of California has been investigated using basaltic glass samples. These samples show trace element patterns similar to enriched mid-ocean ridge basalts, suggesting that the nascent oceanic crust in the Guaymas Basin might be generated through partial melting of a depleted mantle source metasomatized by subducted slab materials.
Article
Geochemistry & Geophysics
Jean-Michel Brazier, Katja E. Goetschl, Martin Dietzel, Vasileios Mavromatis
Summary: This study estimated the distribution coefficient of Zn2+ between calcite/aragonite and reactive fluids and found that the growth rate strongly influences D-Zn(2+) in both minerals. Additionally, a linear correlation was found between D-Zn(2+) and the saturation degree of the reactive fluid.
Article
Geochemistry & Geophysics
Ming Lei, Michele Lustrino, Jifeng Xu, Zhiqiang Kang, Zhengfu Guo, Jianlin Chen
Summary: This study presents a comprehensive geochronological, mineralogical, and geochemical analysis of olivine leucitites in the Maiga area of southern Tibet, suggesting that these rocks originate from a carbonated peridotite mantle source and highlighting the possibility of carbonates being recycled deep into the mantle during continental subduction.
Article
Geochemistry & Geophysics
Yuntao Ye, Xiaomei Wang, Huajian Wang, Haifeng Fan, Zhigang Chen, Qingjun Guo, Ziteng Wang, Chaodong Wu, Donald E. Canfield, Shuichang Zhang
Summary: Phosphorus is an essential element for life and its cycle in the ocean is closely connected with the carbon and oxygen cycles. The study of phosphate oxygen isotopes can provide insights into various reactions related to phosphorus. By analyzing carbonate fluorapatite samples from the Mesoproterozoic Era in North China, it was found that the oxygen isotope values were lower compared to modern samples, indicating a warmer climate during that time period and a potential reason for the scarcity of phosphorite.
Article
Geochemistry & Geophysics
Vincent Busigny, Oanez Lebeau, Didier Jezeduel, Carine Chaduteau, Sean Crowe, Magali Ader
Summary: This study conducted high-precision Mo isotope research on hydrothermal metal sulfides from a porphyry copper deposit in Southwest China and found that different stages of mineralization have distinct Mo isotope compositions, providing valuable insights into the behavior of Mo isotopes in magmatic-hydrothermal systems.
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng, Bing Gong
Summary: The study examines the anatectic mechanisms in the Himalayan orogen, finding that pressure and temperature control the reaction, while water content mainly affects the solid-phase composition. Dehydration and hydration melting likely occur at different depths in the crust. This research provides important insights into the melting processes in collisional orogens.