Article
Environmental Sciences
Amy D. Holt, Jason Fellman, Eran Hood, Anne M. Kellerman, Peter Raymond, Aron Stubbins, Thorsten Dittmar, Robert G. M. Spencer
Summary: Climate change is causing glacier retreat and altering watershed biogeochemistry globally. A study in southeast Alaska investigated how streamwater dissolved organic matter (DOM) composition changes during glacier retreat and terrestrial ecosystem succession. The results showed significant changes in DOM composition during the first 200 years after glacier retreat, highlighting the importance of understanding the impacts of glacier retreat on watershed biogeochemistry and coastal ecosystems.
Article
Environmental Sciences
A. M. Booth, B. Buma, S. Nagorski
Summary: Landslides play a role in the global carbon cycle by impacting both the transfer of terrestrial carbon and the distribution of carbon within landscapes. However, the specific effects of landslides on carbon stocks are not well understood. This study presents a model that combines stochastic landslides with terrestrial carbon dynamics, using data from temperate rainforests in southeast Alaska.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2023)
Article
Environmental Sciences
Penghui Li, Wenzhao Liang, Yuping Zhou, Yuanbi Yi, Chen He, Quan Shi, Ding He
Summary: This study explores the impact of hypoxia on the molecular characteristics and preservation of dissolved organic matter (DOM) in estuaries and coastal oceans. The results show significant differences in DOM composition between hypoxic and non-hypoxic areas, with hypoxic sites containing more recalcitrant DOM. Hypoxia conditions facilitate the preservation of terrestrial organic matter and diversify the DOM pool.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hannah M. Franklin, Katrin Doederer, Peta A. Neale, Joshua B. Hayton, Paul Fisher, Paul Maxwell, Anthony R. Carroll, Michele A. Burford, Frederic D. L. Leusch
Summary: Restoring riparian zones with woody vegetation can help protect waterways from sediment and nutrient pollution, but leaf litter can lead to dissolved organic matter leaching into surface waters, generating disinfection by-products (DBPs) during water treatment. The study compared the DBPs formed from leachate of two native Australian riparian trees, finding that Eucalyptus tereticornis leachates produced more DBPs and induced greater toxicity in bioassays compared to Casuarina cunninghamiana and reservoir water. Different tree species have unique DBP profiles, with E. tereticornis posing a greater risk to drinking water quality.
ENVIRONMENTAL POLLUTION
(2021)
Article
Energy & Fuels
Adam Zakrzewski, Marta Waliczek, Pawel Kosakowski, Krzysztof Jurek, Irena Matyasik
Summary: A set of 24 core samples from the Lower Keuperian and Grabfeld Formation in the Polish Basin were analyzed using geochemical and petrological methods. The results showed that the organic matter in the samples is mostly mature/overmature. The presence of allochthonous organic matter influenced some geochemical indicators and indicated the presence of a fluvial-deltaic paleoenvironment. The degree of organic matter diagenetic oxidation was determined using various ratios based on phenanthrene, methylphenanthrenes, and aromatic ketones.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Environmental Sciences
Sarah C. Fell, Jonathan L. Carrivick, Sophie Cauvy-Fraunie, Veronica Crespo-Perez, Eran Hood, Kate C. Randall, Kirsty J. Matthews Nicholass, Scott D. Tiegs, Alex J. Dumbrell, Lee E. Brown
Summary: The study found that glacier retreat is associated with increased decomposition, abundance of fungi, and a specific fungal cellulose-degrading gene. This demonstrates the potential for predicting ecosystem-level functions using gene-level data. Ongoing global decreases in glacier cover are expected to change vital ecosystem functions, including carbon cycle processes, in mountain rivers.
NATURE CLIMATE CHANGE
(2021)
Article
Geochemistry & Geophysics
Xueshi Sun, Dejiang Fan, Peng Cheng, Limin Hu, Xiang Sun, Zhigang Guo, Zuosheng Yang
Summary: Research shows that terrestrial organic carbon delivered by Yangtze River floods plays a significant role in marine sediment distribution and transformation, potentially contributing to a positive feedback loop in global warming.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geosciences, Multidisciplinary
Daniil I. Korobushkin, Ruslan A. Saifutdinov, Andrey G. Zuev, Andrey S. Zaitsev
Summary: Marine organic matter can enter terrestrial ecosystems through abiotic or biotic vectors, but little is known about the assimilation rate in detrital food webs at different distances from water. This study used stable isotope analysis to compare marine organic consumption by terrestrial invertebrates in coastal ecosystems of the Black Sea. The results showed that marine resources can form the basis of the soil food web, but their importance is relatively low in areas closer to the water source.
Article
Engineering, Marine
Noor Fazreen Dzulkafli, Akbariah Mahdzir, Hirofumi Hara
Summary: The research utilized various analytical methods to compare the organic matter in different coastal sediments in Peninsular Malaysia, finding differences in elemental analysis among the three samples, which aligned with results from UV-Vis and fluorescence spectroscopy analyses. WEOM was largely dominated by HFOC, and variations in DOM within different coastal ecosystems could be attributed to various human and land activities.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Roger Carvalho da Silva, Michael Seidel, Thorsten Dittmar, Hannelore Waska
Summary: Submarine groundwater discharge (SGD) connects fresh groundwater and marine ecosystems, and our study focused on spring-type SGD near Sahlenburg/Cuxhaven, Northern Germany. We analyzed the physicochemical parameters, nutrients, and dissolved organic matter (DOM) in groundwater, surface water, and seawater from different seasons. Our data revealed that the groundwater springs had a widespread influence on the tidal flat, affecting salinity, dissolved organic carbon (DOC), nitrate, and oxygen concentrations. We also found inputs of terrestrial DOM from nearby saltmarsh plants and Elbe and Weser estuaries. The geochemical impact of groundwater springs in tidal flats is underestimated, extending far beyond their visible discharge points.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Mengting Li, Guisheng Song, Huixiang Xie
Summary: This study investigated the bio- and photo-lability of dissolved organic matter (DOM) in different areas of the Pearl River estuary. The headwater had higher levels of bio- and photo-labile DOM compared to the mixing zone and mouth, while the latter two had higher levels of bio- and photo-refractory DOM. The impact of pre-biotransformation on DOM photodegradation varied depending on the specific site. UV absorption coefficients were indicators of bio- and photo-refractory DOC, and the relative proportions of transparent and chromophoric DOM controlled the turnover of biolabile DOC and the effect of pre-biotransformation on DOM photodegradation.
MARINE POLLUTION BULLETIN
(2022)
Article
Chemistry, Multidisciplinary
Shengkang Liang, Shanshan Li, Jinqiang Guo, Yanqun Yang, Zehao Xu, Mingzheng Zhang, Hongguan Li, Xihua Yu, Haoyang Ma, Xiulin Wang
Summary: This study investigated the sources, distribution, and fate of particulate organic matter (POM) in the Changjiang Estuary and its adjacent sea. The concentrations of POC, PN, and TPAA decreased from the river end-member to the open sea, with the maximum occurring around the turbidity maximum zone. POM concentrations and composition were controlled by terrigenous input and in situ phytoplankton production.
Article
Environmental Sciences
Yan-Ting Zuo, Shi Cheng, Hao-Han Jiang, Yu-Ze Han, Wen-Xiang Ji, Zheng Wang, Qing Zhou, Ai-Min Li, Wen-Tao Li
Summary: This study investigated the release and treatability of algae-derived organic matter (AOM) during water treatments. It was found that humic substances can protect algal cell membrane during prechlorination, and the variation of humic-like fluorescence can indicate the chlorine dose. Prechlorination released low molecular weight fractions and fluorescent nitrogenous biopterins. Physically extracted AOM cannot represent the released organic matter during prechlorination. Coagulation was more affected by humic substances than AOM released during prechlorination, and high molecular weight biopolymers and humic substances can be removed effectively. Low molecular weight fractions released by prechlorination can also be effectively removed, while other fractions were recalcitrant to coagulation.
SCIENCE OF THE TOTAL ENVIRONMENT
(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
James Schloemer, Lee Ann Munk, Katrin Iken
Summary: Estuaries in high-latitude regions are at risk due to climate-driven effects on terrestrial and marine realms. Increased freshwater discharge from melting glaciers may affect the organic matter flux from land to coastal environments. This study found that in the northern Gulf of Alaska, nearshore food webs rely primarily on marine organic matter rather than terrestrial sources.
ESTUARIES AND COASTS
(2023)