Article
Environmental Sciences
Yunlin Zhang, Lei Zhou, Yongqiang Zhou, Liuqing Zhang, Xiaolong Yao, Kun Shi, Erik Jeppesen, Qian Yu, Weining Zhu
Summary: Chromophoric dissolved organic matter (CDOM) is crucial in the biogeochemical cycle of aquatic ecosystems. Recent studies have focused on characterizing CDOM, mapping its distribution through remote sensing, and investigating the biogeochemical processes involved. Watershed-related processes play a key role in CDOM dynamics, with photochemical degradation and microbial decomposition being significant removal mechanisms.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Wen-Zhuo Zhu, Shu-Heng Wang, De-Zhong Wang, Wei-Hua Feng, Bo Li, Hong-Hai Zhang
Summary: This study investigated the photodegradation behavior of chromophoric dissolved organic matter (CDOM) from different sources under different light treatments. The results showed that UVB had a direct degradation effect on allochthonous CDOM, while UVA had a stronger degradation effect on autochthonous CDOM. The photochemical processes of CDOM can significantly impact its biogeochemical cycle in marine environments.
Review
Oceanography
Toru Hirawake, Joji Oida, Youhei Yamashita, Hisatomo Waga, Hiroto Abe, Jun Nishioka, Daiki Nomura, Hiromichi Ueno, Atsushi Ooki
Summary: The study demonstrates that water mass classification using CDOM parameters is effective in complex coastal sea areas such as the northern Bering Sea and southern Chukchi Sea.
PROGRESS IN OCEANOGRAPHY
(2021)
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
Ganghui Tong, Xueling Yang, Yun Li, Meng Jin, Xubiao Yu, Ying Huang, Rongyue Zheng, Jun-Jian Wang, Huan Chen
Summary: Sunlight plays a significant role in water ecosystems, but the widespread air pollutant, haze, affects the photochemical transformation of dissolved organic matter (CDOM). This study conducted an experiment in a city in China frequently affected by haze pollution and found that haze reduced the intensity of UV light and decreased the loss of dissolved organic carbon. The study also observed that haze influenced the bleaching of CDOM, and UV intensity played a critical role in the composition characteristics of CDOM. Therefore, long-term and large-scale haze may adversely impact water ecosystems through pollutant/nutrient accumulation.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Civil
Qi Huang, Lizhen Liu, Jiacong Huang, Dianwei Chi, Adam Thomas Devlin, Huawu Wu
Summary: The seasonal dynamics of CDOM and DOC in Poyang Lake are important for understanding biogeochemical processes and water quality. Rivers and wetlands greatly influence the quantity and quality of CDOM. The alternations of flood and dry periods have different effects on CDOM and DOC. Wetlands contribute a higher abundance of CDOM and DOC to the lake with lower aromaticity.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Nittala S. Sarma, G. Chiranjeevulu, Sudarsana Rao Pandi, Dokala Bhaskara Rao, V. V. S. S. Sarma
Summary: This study investigates the coupling between Chromophoric Dissolved Organic Matter (CDOM) and Dissolved Inorganic Carbon (DIC) in eighteen Indian estuaries. The study reveals a significant linear relationship between DIC, CDOM abundance, and pH level in most estuaries, with some estuaries showing elevated DIC levels and other indicators suggesting anthropogenic influence. CDOM properties, such as spectral slope and spectral slope ratio, align with these findings. The study also finds that CDOM contributes different proportions of DIC in different estuaries, indicating its importance in the organic alkalinity of estuaries.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yu Zeng, Qinglong Fu, Dionysios D. Dionysiou, Mingyang Zhang, Mabo Li, Bo Ye, Ning Chen, Juan Gao, Yujun Wang, Dongmei Zhou, Guodong Fang
Summary: This study investigated the photo-transformation of Imidacloprid (IMD) during rice growth and found that the presence of different reactive intermediates (RIs) significantly enhanced the degradation rate of IMD. Evaluation of the photodegradation products of IMD showed that some were harmful to aquatic animals, while others were detoxification processes. A model was developed to predict the photodegradation kinetics of IMD in paddy waters at different stages of rice growth.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Nikita Kaushal, Nivedita Sanwlani, Jani T. I. Tanzil, Nagur Cherukuru, Syamil Sahar, Moritz Mueller, Aazani Mujahid, Jen N. Lee, Nathalie F. Goodkin, Patrick Martin
Summary: Terrigenous dissolved organic matter (tDOM) carried by rivers is an important carbon flux to the coastal ocean, rich in light-absorbent chromophoric dissolved organic matter (CDOM). Luminescence green-to-blue (G/B) ratios in coral cores correlate strongly with remote sensing-derived CDOM absorption, indicating control by rainfall and solar radiation.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Aobo Ju, Hu Wang, Lequan Wang, Yuang Weng
Summary: In this study, machine learning models (BPNN, RF, and XGBoost) were used to predict the CDOM ultraviolet absorption spectra between 215 and 350 nm based on the raw absorption spectra of seawater. The results showed that all three models were able to effectively predict the CDOM absorption spectra, with the XGBoost model performing the best. The predicted spectra were then used to calculate the spectra slopes at shorter wavelengths (S215-240 and S215-275), which were found to be similar to the widely used spectra slopes at longer wavelengths (S275-295).
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
E. Elena Garcia-Martin, Richard Sanders, Chris D. Evans, Vassilis Kitidis, Dan J. Lapworth, Andrew P. Rees, Bryan M. Spears, Andy Tye, Jennifer L. Williamson, Chris Balfour, Mike Best, Michael Bowes, Sarah Breimann, Ian J. Brown, Annette Burden, Nathan Callaghan, Stacey L. Felgate, James Fishwick, Mike Fraser, Stuart W. Gibb, Pete J. Gilbert, Nina Godsell, Africa P. Gomez-Castillo, Geoff Hargreaves, Oban Jones, Paul Kennedy, Anna Lichtschlag, Adrian Martin, Rebecca May, Edward Mawji, Ian Mounteney, Philip D. Nightingale, Justyna P. Olszewska, Stuart C. Painter, Christopher R. Pearce, M. Gloria Pereira, Kate Peel, Amy Pickard, John A. Stephens, Mark Stinchcombe, Peter Williams, E. Malcolm S. Woodward, Deborah Yarrow, Daniel J. Mayor
Summary: The research demonstrates that the fate of organic carbon in estuaries is strongly influenced by land use, with different land use types affecting the composition and flow of dissolved organic matter (DOM).
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Engineering, Environmental
Rong Xu, Jing Zhang, Jianwei Li, Rui Liu, Maofei Ni, Guangneng Zeng
Summary: Biological degradation plays a significant role in the turnover of aquatic dissolved organic matter (DOM). The specific biological pathways involved in DOM degradation, however, remain unclear. In this study, the changes in DOM during a 28-day incubation in a karst river were analyzed using fluorescent excitation-emission matrix (EEM) combined with parallel factor analysis (PARAFAC) and peak picking. Different components of DOM were identified, and the results indicated that biogenic DOM was preferentially consumed during the incubation. The study also demonstrated the usefulness of fluorescence measurement in deciphering riverine DOM biodegradation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
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
Ruosha Zeng, Chris M. Mannaerts, Caroline Lievens
Summary: UV-VIS spectral analysis methods were used to quantify CDOM absorption properties. Spectroscopic parameters were evaluated for their correlation with H/C and O/C ratios, and S275-295 showed the strongest correlation with H/C ratio, while S-R and E-4/E-6 showed strong correlation with O/C ratio. Gaussian fitting was suitable for single CDOM components, while derivative analysis could be used for single-component discrimination.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Environmental Sciences
Stephanie Shousha, Roxane Maranger, Jean-Francois Lapierre
Summary: This study quantified the changes in dissolved organic matter (DOM) composition and nutrient forms along a river with different land use and seasonal patterns. The results showed significant spatial and temporal shifts in DOM composition associated with different nutrient forms. These changes indicated contrasting loading and processing potential depending on land use and seasonal patterns.
Article
Engineering, Environmental
Henry P. Huntington, Andrey Zagorsky, Bjorn P. Kaltenborn, Hyoung Chul Shin, Jackie Dawson, Maija Lukin, Parnuna Egede Dahl, Peiqing Guo, David N. Thomas
Summary: The changing Arctic Ocean is impacting Arctic societies and the global community, with threats to food security and culture for Indigenous Peoples, as well as new opportunities and challenges arising from resource development and tourism growth. Additionally, geopolitical tensions and economic shifts are emerging as interest in the Arctic increases.
Article
Limnology
Eero Asmala, Joonas J. Virtasalo, Matias Scheinin, Sara Newton, Tom Jilbert
Summary: This study investigates the biogeochemical drivers of particulate nutrient dynamics in estuarine environments through experiments and field data. The results indicate that salt-induced flocculation has a significant impact on particle concentrations and sizes, with particle dynamics being dominated by processes downstream of the flocculation zone.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Engineering, Environmental
Mu Lin, Jixin Qiao, Xiaolin Hou, Peter Steier, Robin Golser, Martin Schmidt, Olaf Dellwig, Martin Hansson, Orjan Back, Vesa-Pekka Vartti, Colin Stedmon, Jun She, Jens Murawski, Ala Aldahan, Stefanie A. K. Schmied
Summary: The Baltic Sea receives a significant amount of hazardous substances and nutrients, which have long-lasting effects on its ecosystems. This study presents the first three-dimensional distributions of U-236 and U-233 in the Baltic Sea, as well as a long-term simulation of U-236 dispersion in the North-Baltic Sea. The research findings indicate that atmospheric fallouts and discharges from nuclear reprocessing plants are the main sources of U-236 in the Baltic Sea.
Article
Ecology
Johanna Sjostedt, Urban J. Wunsch, Colin A. Stedmon
Summary: The persistence of dissolved organic matter in aquatic environments can be partly explained by the high diversity and low concentrations of carbon substrates. However, changes in substrate quality can affect bacterial community composition and carbon uptake rates.
AQUATIC MICROBIAL ECOLOGY
(2022)
Article
Environmental Sciences
Kristian Spilling, Eero Asmala, Noora Haavisto, Lumi Haraguchi, Kaisa Kraft, Anne-Mari Lehto, Aleksandra M. Lewandowska, Joanna Norkko, Jonna Piiparinen, Jukka Seppala, Mari Vanharanta, Anu Vehmaa, Pasi Ylostalo, Timo Tamminen
Summary: Climate change-induced brownification affects the coastal seas and has potential impacts on the planktonic ecosystem, including changes in phytoplankton community composition and carbon fluxes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Henry C. Henson, Johnna M. Holding, Lorenz Meire, Soren Rysgaard, Colin A. Stedmon, Alice Stuart-Lee, Jorgen Bendtsen, Mikael Sejr
Summary: Greenland's fjords and coastal waters are highly productive and sustain important fisheries, but retreating glaciers and increasing meltwater are changing fjord circulation and biogeochemistry, potentially threatening future productivity. The freshening of Greenland fjords caused by unprecedented melting of the Greenland Ice Sheet may alter carbonate chemistry in coastal waters, impacting CO2 uptake and causing acidification-related biological consequences. However, there have been few studies on the current acidification state in Greenland coastal waters.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Zina Kebir, Catherine Chambers, Andre Frainier, Vera Hausner, Ann Eileen Lennert, Jennifer Lento, Amanda Poste, Virve Ravolainen, Angelika H. H. Renner, David N. Thomas, Kerry Waylen
Summary: There is an urgent need to understand and address the risks associated with a warming climate for ecosystems and societies in the Arctic and sub-Arctic regions. Major gaps in understanding climate change effects and the need for collaborative efforts to resolve them were identified by a panel of scientists and practitioners in the Norwegian High North.
Article
Limnology
Anders Dalhoff Bruhn, Urban Wunsch, Christopher L. Osburn, Jacob C. Rudolph, Colin A. Stedmon
Summary: Analysis of lignin in seawater is crucial for understanding the behavior of terrestrial dissolved organic matter (DOM) in the ocean and its role in the carbon cycle. An improved method using liquid chromatography (LC) and absorbance detection is presented, which effectively quantifies lignin phenols with improved sensitivity and specificity compared to manual integration methods. The method achieves detection limits below 5 nmol L-1 for most lignin phenols and demonstrates good reproducibility. Application of the method to seawater samples confirms the potential of LC and absorbance detection for analysis of dissolved lignin.
LIMNOLOGY AND OCEANOGRAPHY-METHODS
(2023)
Article
Engineering, Environmental
Mathis von Ahnen, Colin A. Stedmon, Adam C. Hambly
Summary: The study investigated whether foam fractionators could effectively reduce the leaching of dissolved organic matter from woodchip bioreactors during start-up. The results showed that foam fractionation removed 37.8 +/- 4.7% of the dissolved chemical oxygen demand (CODdiss) filtered by the bioreactors during the first 11 days of operation, thus reducing their environmental impact.
WATER SCIENCE AND TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Gang Lin, Jixin Qiao, Paul A. Dodd, Rafael Goncalves-Araujo, Mats A. Granskog, Peter Steier, Colin A. Stedmon
Summary: This study demonstrates the improvement in estimating the transit times of different Atlantic water pathways in the Arctic Ocean by combining measurements of CDOM with U-236(NRPs).
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Rafael Goncalves-Araujo, Mats A. Granskog, Christopher L. Osburn, Piotr Kowalczuk, Colin A. Stedmon
Summary: This study presents a simple and feasible method for estimating DOC concentrations in Arctic waters using CDOM absorption spectroscopy. The algorithm accurately reproduces DOC profiles and mixing plots at different locations, capturing the DOC concentration gradient between Arctic riverine and marine systems.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Andreas Libonati Brock, Kristin Kostadinova, Emma Mork-Pedersen, Fides Hensel, Yifeng Zhang, Borja Valverde-Perez, Colin A. Stedmon, Stefan Trapp
Summary: Marine dead zones, caused by hypoxia, have been expanding and threatening coastal marine life. In order to protect the marine environment from the formation of dead zones, sediment microbial fuel cells (SMFCs) were tested for their ability to reduce the release of sulfide from sediments. The study found that both steel electrodes and charcoal-amended electrodes could effectively reduce sulfide concentrations in bottom water, as well as phosphate concentrations and ammonium.
MARINE POLLUTION BULLETIN
(2023)
Article
Environmental Sciences
Agneta Fransson, Melissa Chierici, Mats A. Granskog, Paul A. Dodd, Colin A. Stedmon
Summary: This study investigates the impact of Greenland Ice Sheet melt on the adjacent waters, revealing that the detrimental effects of ocean acidification and freshening on calcifying organisms may be mitigated by primary production. However, with changing climate and ocean chemistry, the increased meltwater effects may surpass the alleviating effects of primary production.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Martine Lizotte, Bennet Juhls, Atsushi Matsuoka, Philippe Massicotte, Gaelle Mevel, David Obie James Anikina, Sofia Antonova, Guislain Becu, Marine Beguin, Simon Belanger, Thomas Bosse-Demers, Lisa Broeder, Flavienne Bruyant, Gwenaelle Chaillou, Jerome Comte, Raoul-Marie Couture, Emmanuel Devred, Gabriele Deslongchamps, Thibaud Dezutter, Miles Dillon, David Doxaran, Aude Flamand, Frank Fell, Joannie Ferland, Marie-Helene Forget, Michael Fritz, Thomas J. Gordon, Caroline Guilmette, Andrea Hilborn, Rachel Hussherr, Charlotte Irish, Fabien Joux, Lauren Kipp, Audrey Laberge-Carignan, Hugues Lantuit, Edouard Leymarie, Antonio Mannino, Juliette Maury, Paul Overduin, Laurent Oziel, Colin Stedmon, Crystal Thomas, Lucas Tisserand, Jean-Eric Tremblay, Jorien Vonk, Dustin Whalen, Marcel Babin
Summary: Climate warming in the Arctic is expected to change the distribution and dynamics of carbon in frozen grounds. Thawing permafrost in the Mackenzie River watershed releases organic matter into the Arctic Ocean, but its fate remains poorly understood. Field expeditions were conducted to study this process in the Mackenzie Delta region and southern Beaufort Sea, with the collaboration of local communities and the measurement of various physical, chemical, and biological variables.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Chemistry, Analytical
Anna-Ricarda Schittich, Ursula S. McKnight, Colin Stedmon, Barth F. Smets
Summary: Natural dissolved organic matter (DOM) can influence the biodegradation of organic micropollutants (OMP) in aquatic systems. This study found that a specific OMP degrader strain had high substrate specificity but was also able to compete with other common strains for biodegradation. These results can inform the development of modeling frameworks investigating the influence of DOM on OMP biodegradation.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2022)
