Review
Environmental Sciences
Bin Hu, Peifang Wang, Chao Wang, Tianli Bao
Summary: This study provides a systematic overview of the photogeochemistry of particulate organic matter (POM) in aquatic environments, focusing on photodissolution and photo induced flocculation processes. Photodissolution can alter the bioavailability of organic matter and impact the biogeochemical cycling of nutrients, heavy metals, and organic pollutants; while photo induced flocculation may influence the transport and transformation of organic matter and associated pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Ruben Campanero, Nadia Burgoa, Bieito Fernandez-Castro, Sara Valiente, Mar Nieto-Cid, Alba M. Martinez-Perez, Maria Dolores Gelado-Caballero, Nauzet Hernandez-Hernandez, Angeles Marrero-Diaz, Francisco Machin, Angel Rodriguez-Santana, Ines Hernandez-Garcia, Antonio Delgado-Huertas, Antonio Martinez-Marrero, Javier Aristegui, Xose Anton Alvarez-Salgado
Summary: In this study, the distributions of dissolved and suspended organic matter in the Cape Verde Frontal Zone (CVFZ) were investigated at high resolution. The results indicate that the input of Sahara dust and release of DOM from sinking particles are key factors contributing to the complexity of DOM and POM dynamics in the CVFZ.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Microbiology
Meggie Hudspith, Laura Rix, Michelle Achlatis, Jeremy Bougoure, Paul Guagliardo, Peta L. Clode, Nicole S. Webster, Gerard Muyzer, Mathieu Pernice, Jasper M. de Goeij
Summary: Sponges are recognized as key ecosystem engineers in aquatic habitats, with the ability to process organic matter efficiently. Through experiments, it is found that microbial communities in high and low microbial abundance sponges interact with hosts in nutrient exchange and symbiotic relationships.
Article
Environmental Sciences
Limei Mo, Qiaohui Wang, Erping Bi
Summary: The transport of organic contaminants in groundwater can be significantly influenced by the presence of dissolved organic matter (DOM) from various sources. This study investigated the impact of endogenous and exogenous DOM (referred to as DOMen and DOMex) on the sorption behavior of bisphenol A (BPA) onto two different soils. The results revealed that soil organic matter content and DOM properties played key roles in BPA sorption onto soils. Additionally, the presence of DOMen affected BPA sorption differently in the two soils due to differences in their inorganic components.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Yanan Liu, Jingya Xue, Zhifan Gui, Lu Zhang, Xiaolong Yao
Summary: This study investigates the photoreactivity of dissolved organic matter (DOM) from different sources in the Lake Taihu basin. The results show that the original composition and sources of DOM are closely related to its photoreactivity. DOM from macrophytes releases soluble components under light exposure, while DOM with higher aromacity shows photobleaching effects and increased humification degree. Allochthonous anthropogenic DOM exhibits stronger photo-ammonification. The form of inorganic nutrient releases during DOM photolysis also varies with the original DOM sources.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Yifan Wang, Jianen Li, Liang Xu, Qinbo Xu, Di Wu, Yunhe Ai, Dannan Li, Wei Liu, Jianhua Qu, Lei Wang, Ying Zhang
Summary: This study investigates the interaction between biochar-derived dissolved organic matter (DOM) and metal pollutant Pb(II) during adsorption. The results show that DOM significantly enhances the adsorption efficiency of Pb(II). Various testing methods reveal a static quenching mechanism between DOM and Pb(II), which has significant implications for environmental science and other fields.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Emma L. Trainer, Matthew Ginder-Vogel, Christina K. Remucal
Summary: Dissolved organic matter (DOM) varies in composition across different water sources, impacting its reactivity with manganese oxides. Highly aromatic DOM undergoes significant changes, while lignin-like carbon reacts selectively with acid birnessite in all samples to form a variety of aqueous products. This highlights the link between DOM composition and its oxidative transformation in diverse water systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Biotechnology & Applied Microbiology
Sara Campana, Ana Riesgo, Evelien Jongepier, Janina Fuss, Gerard Muyzer, Jasper M. de Goeij
Summary: This study investigates the differential gene expression of two sponge holobionts after feeding on coral- and macroalgal-DOM sources. The results show that there are slight but significant differences in gene expression between the two treatments in both high and low microbial abundance sponges. Processes related to immune response, signaling pathways, and metabolic pathways were regulated in the hosts, while carbohydrate metabolism was upregulated in the associated microbiota. This study provides insights into the metabolic activity of sponge holobionts in response to different DOM sources.
Article
Environmental Sciences
Norbert Kamjunke, Liza-Marie Beckers, Peter Herzsprung, Wolf von Tumpling, Oliver Lechtenfeld, Joerg Tittel, Ute Risse-Buhl, Michael Rode, Alexander Wachholz, Rene Kallies, Tobias Schulze, Martin Krauss, Werner Brack, Sara Comero, Bernd Manfred Gawlik, Hello Skejo, Simona Tavazzi, Giulio Mariani, Dietrich Borchardt, Markus Weitere
Summary: This study investigated autotrophic processes, heterotrophic carbon utilization, and micropollutant concentrations in the River Elbe, Germany, using a Lagrangian sampling design. The results showed that under base flow conditions, there was an increase in phytoplankton biomass and photosynthesis from upstream to downstream, while concentrations of dissolved macronutrients decreased. Bacterial abundance and production increased less than in wetter years, and there were changes in bacterial community composition downstream. DOM components increased due to microbial production, while some pollutants showed higher concentrations downstream. However, their magnitudes were not distinctly different from conditions at medium discharges.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Liuqing Zhang, Y. Jun Xu, Siyue Li
Summary: Rapid urbanization significantly alters carbon biogeochemical cycle and river hydrology. This study found that urban land use increases the levels of dissolved organic matter (DOM) and its autochthonous sources in rivers. Urban-induced nutrient enrichment also contributes to the increased DOM production in rivers.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Anne M. Kellerman, Jorien Vonk, Stephanie McColaugh, David C. Podgorski, Elise van Winden, Jon R. Hawkings, Sarah Ellen Johnston, Munir Humayun, Robert G. M. Spencer
Summary: Glaciers and ice sheets store significant amounts of dissolved organic matter (DOM) and their rapid mass loss may increase fluxes of DOM into proglacial environments. Research on the molecular composition of glacially derived DOM is limited, but findings from Arctic glacial environments show differences in DOM between Greenland and Svalbard, suggesting varied sources of DOM. Supraglacial meltwater samples contain abundant aliphatic and peptide-like formulae, indicating energy-rich sources that contribute to microbial degradation in coastal systems as glaciers lose mass.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Environmental Sciences
Zhe Wang, Min Lv, Chu-Long Huang, Dong-Dong Zhang, Ruixia Han, Gang Li, Ling-Xin Chen
Summary: This study found that anthropogenic activities, such as urbanization and oil combustion, have a significant impact on the distribution and properties of dissolved organic matter (DOM) in intertidal sediments. The release of organic matters from urbanization and the combustion of oil contribute to the higher concentration of aromatic compounds in the sediments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Haoyu Ren, Xin Yao, Feiyang Ma, Tuantuan Fan, Huanguang Deng, Yinghao Zhang
Summary: Nansi Lake is the largest lake along the eastern route of China's SNWDP, with spatial and temporal differences in DOM properties between its upper and lower areas. Protein-like substances play a significant role in influencing DOM properties in April and July.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Jin Zhao, Tianxiang Jiang, Yu Cheng, Junrui Cao
Summary: This study investigated the mitigating effect of micro-flocculation as a pre-treatment process on membrane fouling caused by organic matter. The results showed that micro-flocculation effectively removed large molecular weight organics and controlled membrane fouling. It is beneficial for improving membrane technology.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Zhiling Zhao, Lu Wang, Dongdong Wang, Tianneng Lai
Summary: In the process of water distribution, the secondary pollution of drinking water caused by organic matter cannot be ignored. A comprehensive analysis of the two forms of organic matter in distributed water was conducted, indicating that more organic matter exists on particulate matter or in particle form rather than in a dissolved state. The content of particulate organic matter (POM) in different particle size ranges varies, showing no obvious regularity.
Article
Environmental Sciences
Britta M. Voss, Timothy Eglinton, Bernhard Peucker-Ehrenbrink, Valier Galy, Susan Q. Lang, Cameron McIntyre, Robert G. M. Spencer, Ekaterina Bulygina, Zhaohui Aleck Wang, Katherine A. Guay
Summary: The sources of carbon in the Fraser River system vary spatially and temporally. Tributaries in the northern interior consistently contribute higher concentrations of dissolved organic carbon (DOC) to the main stem. The radiocarbon age of DOC exported from the Fraser River does not change significantly across seasons, indicating that there is modulation of heterogeneous chemical and isotopic signals during transit through the river basin. Dissolved inorganic carbon (DIC) concentrations are highest in the Rocky Mountain headwater region and in tributaries with high DOC concentrations, suggesting that DOC respiration plays a significant role in DIC in this basin. Overall, the cycling of DOC and DIC is closely linked in the river network, with active processing and transformation of carbon during transport.
Article
Geochemistry & Geophysics
Kristian J. Olson, Emmanuel Guillerm, Mark D. Peaple, Tim K. Lowenstein, Veronique Gardien, Frederic Caupin, Sarah J. Feakins, Jessica E. Tierney, Justin Stroup, Steve Lund, David McGee
Summary: This study applies a novel method called Brillouin thermometry to investigate the paleoclimate records of Searles Lake, California. The comparison between Brillouin temperatures and predicted equilibrium temperatures of salt crystallization sheds light on the seasonal processes of evaporite deposition and diagenesis. The temperature record of Searles Lake agrees with other regional records at glacial/interglacial timescales, but displays wider millennial-scale variability.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geography, Physical
Mateja Ogric, Mathieu Dellinger, Katherine E. E. Grant, Valier Galy, Xin Gu, Susan L. L. Brantley, Robert G. G. Hilton
Summary: The oxidation of petrogenic organic carbon (OCpetro) is an important source of carbon dioxide, but the rates of OCpetro oxidation in regions with low rates of denudation are poorly understood. In this study, we used radiocarbon and the trace element rhenium (Re) to track OCpetro oxidation in the Susquehanna Shale Hills Critical Zone Observatory. Our findings suggest that OCpetro oxidation rates are low, which is consistent with the low denudation rates and low OCpetro concentrations in this region.
EARTH SURFACE PROCESSES AND LANDFORMS
(2023)
Article
Soil Science
Yufu Jia, Zongguang Liu, Lei Zhou, Xiaojuan Liu, Keping Ma, Xiaojuan Feng
Summary: Soil organic carbon (SOC) is important for ecosystem carbon sequestration and climate change mitigation, but its sourcing and regulating mechanisms in the rhizosphere remain poorly understood. This study collected rhizosphere and non-rhizosphere soils under different mycorrhizal tree species and assessed potential mechanisms influencing the distribution of plant and microbial residues. The results showed that rhizosphere SOC had higher concentrations of lignin phenols and amino sugars, especially under ectomycorrhizal trees. These findings highlight differences in and controls on rhizosphere SOC sourcing related to different mycorrhizal tree species.
SOIL BIOLOGY & BIOCHEMISTRY
(2023)
Article
Geosciences, Multidisciplinary
Emily J. Tibbett, Natalie J. Burls, David K. Hutchinson, Sarah J. Feakins
Summary: This study reevaluates the proxy temperature records and model simulations in the southern high latitudes during the Eocene-Oligocene transition (EOT). It finds that the cooling during the EOT was primarily driven by a decrease in pCO(2). The multi-model ensemble suggests a 30% to 33% decrease in pCO(2) is needed to best fit the temperature proxies.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Editorial Material
Geosciences, Multidisciplinary
Harihar Rajaram, Suzana Camargo, Christopher D. Cappa, Andrew J. Dombard, Kathleen A. Donohue, Sarah Feakins, Lucy Flesch, Alessandra Giannini, Yu Gu, Christian Huber, Valeriy Ivanov, Kristopher Karnauskas, Monika Korte, Gang Lu, Gudrun Magnusdottir, Mathieu Morlighem, German A. Prieto, Bo Qiu, Hui Su, Daoyuan Sun, Kaicun Wang, Caitlin Whalen, Angelicque E. White, Quentin Williams, Andrew Yau
Summary: On behalf of the journal, AGU, and the scientific community, the editors of Geophysical Research Letters express sincere gratitude to the reviewers who contributed to manuscript reviews in 2022. The reviewers' efforts not only improve the quality of the manuscripts but also enhance the scientific rigor of future research. Many reviewers have also played a crucial role in evaluating data accessibility and availability, providing insightful comments to improve data presentation and quality, thus advancing open science as desired by AGU's data policy. The timely reviews provided amidst the demands of the rapid review process at Geophysical Research Letters are particularly appreciated. In 2022, we received 6,687 submissions and 5,247 reviewers contributed 8,720 reviews in total, demonstrating their invaluable contributions in these challenging times.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Biodiversity Conservation
Xiaojuan Feng, Simin Wang
Summary: Microbe-mediated carbon transformation is crucial for soil carbon sequestration, serving as a key strategy for long-term carbon neutrality. Evaluating the efficiency of microbial necromass accumulation in relation to plant carbon input or microbial respiration can provide insights into promoting soil carbon sequestration from an ecosystem perspective.
GLOBAL CHANGE BIOLOGY
(2023)
Article
Multidisciplinary Sciences
Renee Z. Wang, Robert J. Nichols, Albert K. Liu, Avi I. Flamholz, Juliana Artier, Doug M. Banda, David F. Savage, John M. Eiler, Patrick M. Shih, Woodward W. Fischer
Summary: The history of Earth's carbon cycle is reflected in the composition of the atmosphere and the evolution of photosynthesis. Carbon isotope ratios in sedimentary rocks have recorded key parts of the carbon cycle. However, there are longstanding questions about how the evolution of photosynthesis has impacted these records.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Geochemistry & Geophysics
Ulrich M. Hanke, Alan R. Gagnon, Christopher M. Reddy, Mary C. Lardie Gaylord, Anne J. Cruz, Valier Galy, Roberta L. Hansman, Mark D. Kurz
Summary: Sequential thermal analysis is used for analyzing the carbon mixtures in mineral matrices for stable carbon and radiocarbon isotope analyses. This study focuses on improvements in sample processing, instrument modifications, and procedural standards for better analyses. The aim is to standardize procedures and prepare for future innovations in stable carbon isotopes and direct AMS-interface measurements.
Article
Biochemistry & Molecular Biology
Renee Z. Wang, Albert K. K. Liu, Douglas M. M. Banda, Woodward W. W. Fischer, Patrick M. M. Shih
Summary: A closely related sister clade of octameric rubiscos (Form I') has been recently discovered, which can assemble without small subunits (RbcS) unlike Form I rubisco. The KIE measurement indicates that the L-8 rubisco has a smaller kinetic isotope effect compared to Form I rubisco, suggesting that the small subunits may affect the enzyme's function. These findings provide new insights into the function of RbcS and the interpretation of environmental carbon isotope data.
Article
Geosciences, Multidisciplinary
Rachel T. So, Tim K. Lowenstein, Elliot Jagniecki, Jessica E. Tierney, Sarah J. Feakins
Summary: This study investigates the sediment samples from Great Salt Lake (GSL) to understand the hydroclimate variations during the Holocene. The analysis of microbial membrane lipids reveals that GSL has maintained a high salinity level throughout the mid-Holocene, with a further increase during the regional drought. The current drying may lead to a return to the conditions not seen since the mid-Holocene.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Multidisciplinary Sciences
Yunpeng Zhao, Chengzhu Liu, Xingqi Li, Lixiao Ma, Guoqing Zhai, Xiaojuan Feng
Summary: Sphagnum wetlands are important for carbon storage, as they accumulate decay-resistant litter and mineral-associated organic carbon (MAOC). This study found that Sphagnum promotes the accumulation of metal-bound OC through the activation of iron and aluminum oxides in the soil. The unique metabolites of Sphagnum further enhance metal-organic associations, leading to the dominance of metal-bound OC in soil MAOC. These findings demonstrate that Sphagnum acts as an efficient 'rust engineer' that boosts the rusty carbon sink in wetlands.
NATURE COMMUNICATIONS
(2023)
Editorial Material
Environmental Sciences
Marguerite A. Xenopoulos, Ben Bond-Lamberty, Deborah Huntzinger, Ankur R. Desai, Xiaojuan Feng, William M. Hammond, David J. P. Moore, Xuefeng Peng, Dork Sahagian, Cristina Santin, Rodrigo Vargas, Naomi S. Wells, Paige Wooden
Summary: We have committed to improving the inclusion of underrepresented members in our community in the publication pipeline of JGR: Biogeosciences. Our commitment includes regular updates on policies, concrete actions, and efforts to tackle biases and promote equitable research. Progress has been made in diversifying our editorial teams, increasing awareness of unconscious bias in peer-review, and fostering inclusion in global collaborations. Our update highlights gender disparities in manuscript submissions and decisions, and presents a pilot program to address ethical and equitable collaborations in resource-poor settings. Next steps include a thorough analysis of reviewer demographics.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Erxiong Zhu, Zongguang Liu, Simin Wang, Yiyun Wang, Ting Liu, Xiaojuan Feng
Summary: The binding of organic carbon (OC) to minerals is crucial for the persistence of soil organic carbon (SOC), which is necessary for long-term sequestration of atmospheric carbon dioxide into soils. However, the relative importance of metal oxides and silicate clay in SOC protection remains unclear, limiting our ability to predict and protect this important reservoir of persistent SOC.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Ecology
Shane W. Stoner, Marion Schrumpf, Alison Hoyt, Carlos A. Sierra, Sebastian Doetterl, Valier Galy, Susan Trumbore
Summary: Carbon (C) in soils persists on different timescales depending on physical, chemical, and biological processes. Thermal fractionation has shown promise for separating young from old C by decomposing soil organic matter (SOM) at increasing heat levels. This study investigates the age distribution of C in different fractions separated by density and chemical properties using radiocarbon (C-14) and C-13 analysis during thermal fractionation.