Article
Geochemistry & Geophysics
Christian Grimm, Agnes Feurtet-Mazel, Oleg S. Pokrovsky, Eric H. Oelkers
Summary: Riverine particulates play a crucial role in transporting essential nutrients and affecting organic carbon burial in ocean margins. Microcosm experiments demonstrate the positive impact of riverine particulate material on diatom growth, as well as its role in organic carbon burial through aggregation and sedimentation of phytoplankton. The supply of riverine particulate material is highly sensitive to climate change and contributes significantly to regulating atmospheric CO2 concentrations.
Article
Engineering, Environmental
Elizabeth K. Coward, Kristi Seech, Melissa L. Carter, Reinhard E. Flick, Vicki H. Grassian
Summary: The record-setting wildfires in the western United States in 2020 released a large amount of organic carbon into the environment, including the adjacent Pacific Ocean. However, little is known about the fate of marine wildfire-derived dissolved organic matter (DOM). Our study found that the concentration of dissolved organic carbon in Pacific surface waters increased 2 to 4 times after the wildfires compared to before the wildfires. The concentration of organic carbon was well correlated with atmospheric pyrogenic proxies, supporting the conclusion that it originated from the wildfires.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2022)
Article
Environmental Sciences
Saumya Silori, Haimanti Biswas, Mintu Chowdhury, Diksha Sharma, Mandeng-Yogo Magloire, Damien Cardinal
Summary: The study reveals the factors responsible for spatial and interannual variability in particulate organic matter (POM) and 813CPOC values in the western Indian Shelf waters. The dominance of upwelling in the south leads to higher phytoplankton biomass and POM values, while low nutrient warm waters prevail in the north.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Harikrishna Prasad Mamidala, Dipnarayan Ganguly, Purvaja Ramachandran, Yudhistir Reddy, Arumughan Paneer Selvam, Gurmeet Singh, Kakolee Banerjee, Radhakrishnan Subhadra Robin, Ramesh Ramachandran
Summary: The distribution and sources of particulate organic carbon and nitrogen in mangroves ecosystems along the east and west coast of India were examined. The results showed that water quality in these mangrove waters is influenced by land-based contaminants and the concentration of particulate organic carbon is higher in the east coast.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Soil Science
Yuqi Wei, Yingjun Zhang, Gail W. T. Wilson, Yafen Guo, Yixian Bi, Xue Xiong, Nan Liu
Summary: It was found in this study that trampling increased the transfer of litter C to the SOC pool, enhancing SOC formation, without inducing significant positive priming effects. This indicates that trampling plays an important role in SOC formation and stabilization, efficiently transferring litter C into the SOC pool.
Article
Environmental Sciences
Benjamin Gillard, Rob P. Harbour, Nicolas Nowald, Laurenz Thomsen, Morten H. Iversen
Summary: Most studies on potential impacts of deep-sea mining in the Clarion Clipperton Zone (CCZ) have focused on benthic ecosystems, but this study examines the pelagic environment as well. By combining various techniques, the study describes particle abundance and size distribution throughout the water column in the CCZ (German sector) and emphasizes the significant hazard that sedimentation and ballasting effect have on midwater and benthic ecosystems.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
D. J. Clements, S. Yang, T. Weber, A. M. P. McDonnell, R. Kiko, L. Stemmann, D. Bianchi
Summary: The abundance and size distribution of marine particles play a crucial role in various biogeochemical and ecological processes in the ocean, including carbon sequestration. The use of machine learning algorithms and UVP5 optical measurements allows for a global analysis and reconstruction of particle size distributions, revealing consistent global patterns. This approach provides a baseline for a better understanding of particle cycles in the ocean and opens up possibilities for global, three-dimensional reconstructions of PSD and sinking particle fluxes.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
Fred Worrall, Gareth D. Clay, Nicholas J. K. Howden, Tim P. Burt
Summary: The oxidative ratio of the terrestrial biosphere is related to the carbon sink size, which in turn is related to the oxidation state of naturally occurring organic matter. This study proposes using chemical oxygen demand measurements to assess the oxidation state of fluvial organic carbon. Analysis of water quality monitoring data in England reveals the oxidation state of dissolved organic carbon and particulate organic carbon. The inclusion of these estimates in the global oxidative ratio calculation provides a new estimate for the annual flux of CO2 to land.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Review
Oceanography
Hidetaka Nomaki, Eugenio Rastelli, Andreia Alves, Hisami Suga, Sandra Ramos, Tomo Kitahashi, Masashi Tsuchiya, Nanako O. Ogawa, Yohei Matsui, Koji Seike, Norio Miyamoto, Cinzia Corinaldesi, Elisabetta Manea, Naohiko Ohkouchi, Roberto Danovaro, Takuro Nunoura, Teresa Amaro
Summary: This study compared organic matter quantity and quality in abyssal plain sediments in different trophic states, revealing significant differences in biomass and distributions among regions. Nutrient-rich areas showed higher organic carbon content, higher oxygen uptake rates, while the opposite was observed in nutrient-poor regions.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Multidisciplinary Sciences
Megan I. Behnke, Suzanne E. Tank, James W. McClelland, Robert M. Holmes, Negar Haghipour, Timothy I. Eglinton, Peter A. Raymond, Anya Suslova, Alexander Zhulidov, Tatiana Gurtovaya, Nikita Zimov, Sergey Zimov, Edda A. Mutter, Edwin Amos, Robert G. M. Spencer, Andrea Rinaldo
Summary: Arctic rivers are important channels for transmitting signals of change from the changing landscape to the ocean. This study reveals a previously overlooked contribution from aquatic biomass in the particulate organic matter (POM) flux. It also suggests that climate change-induced warming and increasing CO2 concentrations could enhance soil destabilization and aquatic biomass production, leading to increased POM fluxes to the ocean.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Environmental Sciences
Jie Niu, Ziyang Feng, Mingxia He, Mengyu Xie, Yanqun Lv, Juan Zhang, Liwei Sun, Qi Liu, Bill X. Hu
Summary: By incorporating marine particulate organic carbon (POC) and particulate inorganic carbon (PIC) into machine learning (ML) and deep learning (DL) models, successful estimation of chlorophyll-a (Chl-a) concentrations in the Yang Jiang coastal ocean of China was achieved. The Gaussian process regression (GPR) model significantly outperformed the DL model in terms of stability and robustness. This study highlights the efficacy of the GPR model for estimating Chl-a and the importance of considering POC in modeling Chl-a concentrations.
MARINE POLLUTION BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
Xuling Luo, Xiaoyong Bai, Qiu Tan, Chen Ran, Huan Chen, Huipeng Xi, Fei Chen, Luhua Wu, Chaojun Li, Sirui Zhang, Xin Zhong, Shuang Tian
Summary: This study reanalyzed and generated POC flux data of major rivers worldwide using updated databases and models. The results show that Asia exports the most POC, with the Amazon basin being a major contributor to the Atlantic POC. Additionally, there are two key zones of POC flux in the latitude belt.
Article
Multidisciplinary Sciences
Mojtaba Fakhraee, Lidya G. Tarhan, Noah J. Planavsky, Christopher T. Reinhard
Summary: Marine dissolved organic carbon (DOC) plays a crucial role in the global carbon cycle, but its long-term history remains poorly constrained. Research suggests that despite significant changes in the size of the oceanic DOC reservoir throughout Earth's history, the overall size may have undergone very little variation.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geosciences, Multidisciplinary
Yeongjin Ryu, Heejun Han, Taehee Na, Guebuem Kim, Ellen R. M. Druffel, Jeomshik Hwang
Summary: The East Sea, connected to the Northwest Pacific, is a miniature ocean with independent deep water circulation. The radiocarbon age of dissolved organic carbon (DOC) in the East Sea is older than its water turnover time, indicating the transportation of aged DOC from the Northwest Pacific. The oldest DOC is found in the subsurface layer and is a mixture of old DOC from the North Pacific and modern DOC produced in the East Sea. These findings provide insights into the global cycling of DOC in the surface ocean.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geology
Celeste M. Cunningham, R. William C. Arnott
Summary: Deep-marine levees are extensive features that can effectively sequester organic carbon and prevent its degradation. This study investigates the processes that control organic matter accumulation and preservation in deep-marine levees and how these processes have evolved over geological time.
Article
Biochemistry & Molecular Biology
Alise J. Ponsero, Matthew Bomhoff, Kai Blumberg, Ken Youens-Clark, Nina M. Herz, Elisha M. Wood-Charlson, Edward F. Delong, Bonnie L. Hurwitz
Summary: Large-scale oceanic sequencing efforts have improved our understanding of marine microbial communities, while the web-based platform Planet Microbe allows for integration of sequencing data with other environmental datasets in the marine science community.
NUCLEIC ACIDS RESEARCH
(2021)
Article
Ecology
Kevin W. Becker, Matthew J. Harke, Daniel R. Mende, Daniel Muratore, Joshua S. Weitz, Edward F. DeLong, Sonya T. Dyhrman, Benjamin A. S. Van Mooy
Summary: The study revealed that in surface waters of the North Pacific Subtropical Gyre, phytoplankton activity in photosynthesis, photoacclimation, and photoprotection displayed clear diel coordination, with pigment abundances showing a balance between synthesis and consumption. Gene expression exhibited synchronized diel patterns among all taxa, illustrating the significant impact of light on photosynthetic organisms in the ocean.
Article
Ecology
Olivier Pereira, Corentin Hochart, Dominique Boeuf, Jean Christophe Auguet, Didier Debroas, Pierre E. Galand
Summary: The study used time-series data from the NW Mediterranean Sea to reveal different subclades within the Archaea Marine Group IIb family, each with distinct lifestyles and physiologies. The metabolisms and vitamin metabolisms of different ecotypes may be linked to sunlight's energy, and archaea disappeared completely from surface waters in summer. This diversity highlights the importance of time-series studies in uncovering the roles of marine prokaryotes in the ocean.
Article
Multidisciplinary Sciences
Kirsten E. Poff, Andy O. Leu, John M. Eppley, David M. Karl, Edward F. DeLong
Summary: Studies show that elevated carbon flux events in the open ocean lead to increased delivery of carbon from surface waters to the seafloor, with specific microbial taxa positively correlating with these events. Microbial communities enriched on sinking particles during summer ECF events included various types of bacteria, protists, and diatoms, while those during spring ECF events were different, indicating a seasonality in microbial compositions. Additionally, deep-sea bacteria displayed rapid responses to elevated organic matter inputs during summer ECF events.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Microbiology
Dominique Boeuf, John M. Eppley, Daniel R. Mende, Rex R. Malmstrom, Tanja Woyke, Edward F. DeLong
Summary: Through a study on the comparative genomics, ecology, and physiological potential of the SAR324 clade, a significant divergence in the metabolic potentials of different ecotypes living in different habitats was revealed. Ecotypes in the dark or twilight oceans shared features consistent with a sulfur-based chemolithoautotrophic lifestyle, while those in the sunlit ocean displayed a presumptive photoheterotrophic lifestyle. The results highlight the importance of metapangenomic approaches in understanding the properties and variations in function and ecological traits of specific phylogenetic clades within complex microbiomes.
Article
Environmental Sciences
Benedetto Barone, Matthew J. Church, Mathilde Dugenne, Nicholas J. Hawco, Oliver Jahn, Angelicque E. White, Seth G. John, Michael J. Follows, Edward F. DeLong, David M. Karl
Summary: This study examined the biogeochemical impacts of cyclones and anticyclones in the North Pacific Subtropical Gyre. It found that cyclones led to increased nutrient fluxes due to diapycnal mixing, resulting in changes in plankton community and oxygen and nutrient concentrations. However, the stoichiometry of oxygen and inorganic nutrients did not match predictions, suggesting additional biological processes at play. The study highlights the importance of mesoscale biogeochemical perturbations in oligotrophic ecosystems.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Environmental Sciences
Christian Tamburini, Marc Garel, Aude Barani, Dominique Boeuf, Patricia Bonin, Nagib Bhairy, Sophie Guasco, Stephanie Jacquet, Frederic A. C. Le Moigne, Christos Panagiotopoulos, Virginie Riou, Sandrine Veloso, Chiara Santinelli, Fabrice Armougom
Summary: The study used a particle sinking simulator system (PASS) to track the sinking process of laboratory-grown Emiliania huxleyi aggregates in the North Atlantic Ocean, finding that pressure affects prokaryotic degradation and respiration rate, while increasing hydrostatic pressure reduces prokaryotic diversity and species richness.
Article
Ecology
Daniel Muratore, Angela K. Boysen, Matthew J. Harke, Kevin W. Becker, John R. Casey, Sacha N. Coesel, Daniel R. Mende, Samuel T. Wilson, Frank O. Aylward, John M. Eppley, Alice Vislova, Shengyun Peng, Rogelio A. Rodriguez-Gonzalez, Stephen J. Beckett, E. Virginia Armbrust, Edward F. DeLong, David M. Karl, Angelicque E. White, Jonathan P. Zehr, Benjamin A. S. Van Mooy, Sonya T. Dyhrman, Anitra E. Ingalls, Joshua S. Weitz
Summary: By integrating time series analyses of different molecules, the authors demonstrate that microorganisms in the open ocean partition scarce resources temporally, with different microbial groups expressing nitrogen uptake and assimilation processes at different points throughout the day and night cycle. Despite competition for limited nutrients, high taxonomic diversity of microbes in the surface ocean still persists, which challenges ecological theory. The study reveals temporal niche partitioning of nitrogen assimilation processes, with different microbial groups exhibiting asynchronous transcription of genes involved in nitrogen uptake.
NATURE ECOLOGY & EVOLUTION
(2022)
Article
Biotechnology & Applied Microbiology
Morgan D. Linney, John M. Eppley, Anna E. Romano, Elaine Luo, Edward F. DeLong, David M. Karl
Summary: With advances in metagenomic sequencing, this study characterized exocellular free DNA in diverse environmental systems, providing new perspectives on potential ecological dynamics and dimensions for experimental investigations. The study used a newly developed method to separate free DNA from cells, viruses, and vesicles, enabling independent characterization of each fraction. The composition and sources of free DNA in different regions of the water column were examined, revealing implications for dissolved organic matter cycling and export.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Ecology
Elaine Luo, Andy O. Leu, John M. Eppley, David M. Karl, Edward F. DeLong
Summary: This study analyzed 857 virus population genomes associated with sinking particles in the North Pacific Subtropical Gyre and identified new viruses infecting deep-sea bacteria as well as lytic viruses related to carbon export.
Article
Microbiology
Andy O. Leu, John M. Eppley, Andrew Burger, Edward F. DeLong
Summary: Particle-attached microbes play important roles in the ocean carbon cycle by sequestering atmospheric CO2 and delivering nutrients and energy to the deep sea through sinking particles. Genomic traits of particle-attached versus free-living microbes reflect their specific metabolic and ecological roles in the sea, with particle-attached microbes showing larger genomes, better degradation capacities, and higher growth efficiencies compared to free-living counterparts.
Correction
Microbiology
Angela K. Boysen, Laura T. Carlson, Bryndan P. Durham, Ryan D. Groussman, Frank O. Aylward, Francois Ribalet, Katherine R. Heal, Angelicque E. White, Edward F. DeLong, E. Virginia Armbrust, Anitra E. Ingalls
Article
Geosciences, Multidisciplinary
Philippe Massicotte, Rainer M. W. Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Belanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaelle Chaillou, Malik Chami, Bruno Charriere, Jing Chen, Herve Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Jens Ehn, Cedric Fichot, Marie-Helene Forget, Pingqing Fu, Jonathan Gagnon, Nicole Garcia, Beat Gasser, Jean-Francois Ghiglione, Gaby Gorsky, Michel Gosselin, Priscillia Gourvil, Yves Gratton, Pascal Guillot, Hermann J. Heipieper, Serge Heussner, Stanford B. Hooker, Yannick Huot, Christian Jeanthon, Wade Jeffrey, Fabien Joux, Kimitaka Kawamura, Bruno Lansard, Edouard Leymarie, Heike Link, Connie Lovejoy, Claudie Marec, Dominique Marie, Johannie Martin, Jacobo Martin, Guillaume Masse, Atsushi Matsuoka, Vanessa McKague, Alexandre Mignot, William L. Miller, Juan-Carlos Miquel, Alfonso Mucci, Kaori Ono, Eva Ortega-Retuerta, Christos Panagiotopoulos, Tim Papakyriakou, Marc Picheral, Louis Prieur, Patrick Raimbault, Josephine Ras, Rick A. Reynolds, Andre Rochon, Jean-Francois Rontani, Catherine Schmechtig, Sabine Schmidt, Richard Sempere, Yuan Shen, Guisheng Song, Dariusz Stramski, Eri Tachibana, Alexandre Thirouard, Imma Tolosa, Jean-Eric Tremblay, Mickael Vaitilingom, Daniel Vaulot, Frederic Vaultier, John K. Volkman, Huixiang Xie, Guangming Zheng, Marcel Babin
Summary: The MALINA oceanographic campaign in 2009 aimed to investigate carbon stocks and fluxes in the Mackenzie River estuary and Beaufort Sea, collecting a range of physical, chemical, and biological variables across seven transects. Data standardization and compilation efforts have been made to facilitate further studies on the changing Arctic Ocean.
EARTH SYSTEM SCIENCE DATA
(2021)