Article
Ecology
Mohammed Hamdan, Jan Karlsson, Par Bystrom, Mohammed J. Al-Haidarey, Jenny Ask
Summary: This study found that benthic microalgal GPP can be CO2-limited when light is not limiting, and both dissolved inorganic carbon and DOC additions can stimulate benthic GPP.
FRESHWATER BIOLOGY
(2022)
Article
Forestry
Ryan M. Burrows, Micael Jonsson, Emma Faltstrom, Jannika Andersson, Ryan A. Sponseller
Summary: The research indicates that benthic algal growth in boreal forested streams is mainly driven by interactions between nitrogen availability and light reaching benthic surfaces. Additionally, water temperature and depth also play a role in influencing algal growth. Despite high dissolved organic carbon concentrations, it is not a significant predictor of algal growth in small forested streams.
FOREST ECOLOGY AND MANAGEMENT
(2021)
Article
Chemistry, Multidisciplinary
Fabian Steininger, Niels Peter Revsbech, Klaus Koren
Summary: A dipping probe total dissolved inorganic carbon (DIC) microsensor has been developed based on a localized acidic microenvironment, allowing for conversion of bicarbonate and carbonate to CO2. The sensor shows a linear response over a wide range and has the potential for high spatial and temporal resolution measurements of DIC in environmental sensing.
Article
Geosciences, Multidisciplinary
Evan S. Kane, Catherine M. Dieleman, Danielle Rupp, Kevin H. Wyatt, Allison R. Rober, Merritt R. Turetsky
Summary: This study investigated the relationship between algal biomass and the cycling of carbon in boreal rich-fen peatlands, finding that algal production plays a significant role in regulating carbon cycling during flooding periods. The pre-flooding drainage conditions were found to determine the carbon sink-strength of these ecosystems, with implications for DOM characteristics. Monitoring flooding history and its impact on algal production could be crucial for estimating carbon balance in northern wetlands.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Multidisciplinary Sciences
Xavier Mayali, Ty J. Samo, Jeff A. Kimbrel, Megan M. Morris, Kristina Rolison, Courtney Swink, Christina Ramon, Young-Mo Kim, Nathalie Munoz-Munoz, Carrie Nicora, Sam Purvine, Mary Lipton, Rhona K. Stuart, Peter K. Weber
Summary: This study quantified carbon and nitrogen incorporation in bacterial co-cultures growing with diatom at the single-cell level. Unexpected strain and cell variability were observed, and three distinct functional guilds were identified.
NATURE COMMUNICATIONS
(2023)
Article
Fisheries
Heather N. Page, Keisha D. Bahr, Tyler Cyronak, Elizabeth B. Jewett, Maggie D. Johnson, Sophie J. McCoy
Summary: Accurately predicting the effects of ocean and coastal acidification on marine ecosystems requires understanding the scaling of responses from laboratory experiments to the natural world. Comparing directional responses between laboratory experiments and field studies, some responses were consistent while others showed mismatches in directionality.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Environmental Sciences
Martti Rask, Tommi Malinen, Mikko Olin, Kari Nyberg, Jukka Ruuhijarvi, Kimmo K. Kahilainen, Matti Verta, Jussi Vuorenmaa, Tarja-Riitta Blauberg, Lauri Arvola
Summary: This study investigated the total mercury concentration in the muscle of European perch in boreal headwater lakes and found negative correlations between perch THg and lake pH as well as perch growth. By focusing on a subset of lakes in southern Finland, it was discovered that perch THg concentrations increased significantly in lakes where perch populations suffered from severe acid stress in the 1980s during recovery.
WATER AIR AND SOIL POLLUTION
(2021)
Article
Environmental Sciences
Keith E. Schilling, Matthew T. Streeter, Christopher S. Jones, Peter J. Jacobson
Summary: This study examined the carbon flux from artificially-drained cropped fields. The results showed that the dominant carbon export was from inorganic carbon (IC) losses through subsurface drainage tiles. Detailed soil sampling revealed that approximately 0.23% of the total carbon content in shallow soils was lost in a single year. The study suggests the need for improved monitoring of total carbon export from fields for accurate assessment of carbon sequestration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Marine & Freshwater Biology
Songjie He, Kanchan Maiti, Christopher M. Swarzenski, Tracy Elsey-Quirk, Gina N. Groseclose, Dubravko Justic
Summary: This study investigated the porewater carbonate chemistry of three coastal marshes with different salinities in Barataria Basin, Louisiana, USA, and its impact on the surrounding water bodies. The findings showed that porewater DIC and TA increased with depth and were generally higher during warmer months. The flooding regime of the marshes had a significant influence on TA and DIC concentrations, and the export of DIC and TA from coastal marshes has the potential to contribute to coastal acidification.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Environmental Sciences
Ting Sun, Zoe Lindo, Brian A. A. Branfireun
Summary: Climate change-driven ground warming will alter mercury cycling processes in high boreal and subarctic peatlands, particularly increasing MeHg production in subarctic peatlands. Increased soil temperature promotes microbial metabolism and organic matter turnover, resulting in higher concentrations of MeHg in the water.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Engineering, Chemical
Tianting Pang, Frank Marken, Dengsong Zhang, Junjie Shen
Summary: This study reveals for the first time the impact of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) on fluoride removal by membrane capacitive deionization (MCDI). The results show that DIC species decrease fluoride removal, while DOC has an insignificant impact at a moderate concentration.
Article
Environmental Sciences
V Mangal, W. Y. Lam, H. Huang, E. J. S. Emilson, R. W. Mackereth, C. P. J. Mitchell
Summary: This study investigates the molecular composition of dissolved organic matter (DOM) and its relationship with mercury transport and transformations. High-resolution mass spectrometry is used to characterize DOM compound classes, DOM aromaticity, and the nominal oxygenation state of carbon across thirteen small boreal forest streams in central Canada. The results show significant differences in the abundance and classes of DOM compounds correlated with inorganic mercury and methylmercury concentrations across seasons and between mercury forms. Nitrogen and sulfur containing DOM compounds are most often positively correlated with inorganic mercury concentrations in late spring, while low-oxidized lignins are more important in fall. Low-oxidized lignins and hydrolysable tannins account for a large proportion of DOM-MeHg correlations, regardless of season. The study also reveals that the strongest correlations between inorganic mercury and DOM occur across a wide range of carbon oxygenation states, suggesting that DOM involved in inorganic mercury transport encompasses a wide range of polarities and thermodynamic stabilities. In contrast, DOM molecules exclusively correlated with MeHg concentrations have more positive carbon oxygenation states and aromatic qualities, indicating preferential transport of MeHg with more stable and aromatic DOM molecules. DOM molecules correlated with both inorganic mercury and MeHg concentrations are only found in late spring.
Article
Environmental Sciences
Yu Gao, Jiquan Chen, Neil Saintilan, Bin Zhao, Zutao Ouyang, Tingting Zhang, Haiqiang Guo, Yingying Hao, Feng Zhao, Jianyi Liu, Sikai Wang, Ping Zhuang
Summary: This study investigates the lateral hydrological carbon flux for an estuarine marsh over the course of a year. The results show a significant correlation between imported and exported dissolved organic carbon and dissolved inorganic carbon, but not for particulate organic carbon. The marsh appears to be a net exporter of dissolved organic carbon and dissolved inorganic carbon, but a net sink of particulate organic carbon. The findings highlight the importance of lateral hydrological inflows/outflows in wetland carbon budgets, especially in the meta-ecosystem framework.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Lluis Gomez-Gener, Erin R. Hotchkiss, Hjalmar Laudon, Ryan A. Sponseller
Summary: The study utilized 7 years of data from three boreal catchments to investigate how different land-water interfaces modulate carbon concentration in streams and the balance among different forms. Results showed seasonal patterns and C-Q relationships varied across catchments, with different mechanisms regulating the different forms of carbon.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Civil
Haijuan Zhao, Yongjun Jiang, Qiong Xiao, Cheng Zhang, Hamid M. Behzad
Summary: The study reveals a close relationship between the cycling of carbon and nitrogen in karst aquatic systems, with dissolved organic carbon concentrations influenced by the metabolic pathways of subaquatic communities. The metabolic processes of photosynthesis and respiration primarily control the transformation of dissolved inorganic carbon and nitrate, with higher proportions observed in the dry season. The coupled C-N cycling involving DIC and NO3 promotes the production of autochthonous DOC, acting as long-term natural carbon and nitrogen sinks in karst aquatic systems.
JOURNAL OF HYDROLOGY
(2021)