Article
Environmental Sciences
Michael A. Rawlins, Craig T. Connolly, James W. McClelland
Summary: The mobilization and transfer of dissolved organic carbon in Arctic watersheds are closely related to the region's climate and water cycle, and may be affected by climate warming. Simulation studies quantify DOC loadings to western Arctic rivers and validate the results with field measurements and other studies. The modeling framework provides insights into carbon export to coastal waters and the potential impacts of climate change in the Arctic.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Environmental Sciences
Michael A. Rawlins, Craig T. Connolly, James W. Mcclelland
Summary: The study quantifies model-simulated estimates of dissolved organic carbon (DOC) runoff and loadings to western Arctic rivers, capturing a gradient in seasonal DOC concentrations for North Slope Alaska rivers and similar loadings to rivers draining to the north and west. The modeling framework provides insights into carbon export to coastal waters and the impacts of hydrological cycle intensification and permafrost thaw in the Arctic due to ongoing warming. Arctic rivers play a crucial role in transporting freshwater and dissolved organic carbon to the Arctic Ocean, with climate warming influencing the amount of carbon entering river networks from soils.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geochemistry & Geophysics
Ziming Fang, Weifeng Yang, Aron Stubbins, Min Chen, Junjie Li, Renming Jia, Qi Li, Jing Zhu, Bo Wang
Summary: In the Arctic region, the fate and removal process of dissolved black carbon released from river water into the ocean remains unclear. Research findings show that river discharge dominates the spatial distribution of dissolved black carbon in ice-free regions, while sea-ice meltwater dilutes dissolved organic carbon. The removal of riverine dissolved black carbon mainly occurs in shelf regions, playing a crucial role in modulating the delivery of black carbon to the open Arctic Ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Review
Environmental Sciences
Hien Thi Nguyen, Yung Mi Lee, Jong Kuk Hong, Seongjin Hong, Meilian Chen, Jin Hur
Summary: The warming of the Arctic Ocean affects the input of dissolved organic matter (DOM) into the region, which in turn impacts the bacterial communities. Changes in DOM inputs alter the abundance, size, metabolism, and composition of Arctic bacteria. The increase in DOM fluxes and the diversification of DOM composition due to climate warming lead to enhanced CO2 emissions and the emergence of replacement bacterial communities in the Arctic Ocean.
FRONTIERS IN MARINE SCIENCE
(2022)
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
Environmental Sciences
B. Juhls, A. Matsuoka, M. Lizotte, G. Becu, P. P. Overduin, J. El Kassar, E. Devred, D. Doxaran, J. Ferland, M. H. Forget, A. Hilborn, M. Hieronymi, E. Leymarie, J. Maury, L. Oziel, L. Tisserand, D. O. J. Anikina, M. Dillon, M. Babin
Summary: The increasing air temperatures and permafrost thaw in Arctic river watersheds are directly impacting the aquatic environment and changing the quantity and quality of dissolved organic carbon (DOC) transported into the Arctic Ocean. In this study, the strong seasonal dynamics of the Mackenzie River plume and the distribution of terrigenous DOC on the Beaufort Sea Shelf were shown for the first time using in situ and Satellite Ocean Colour Remote Sensing (SOCRS) data. The performance of different algorithms for atmospheric correction and colored dissolved organic matter retrieval were evaluated, and the established DOC-CDOM relationship allowed estimations of DOC concentrations from SOCRS.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Ana Gabriela Bonelli, Vincent Vantrepotte, Daniel Schaffer Ferreira Jorge, Julien Demaria, Cedric Jamet, David Dessailly, Antoine Mangin, Odile Fanton d'Andon, Ewa Kwiatkowska, Hubert Loisel
Summary: A semi-analytical model (CDOM-KD2) has been developed for estimating the absorption by colored dissolved organic matter from ocean color remote sensing, showing slightly better performance compared to former models. The relative contribution of colored dissolved organic matter in absorption exhibits strong spatial disparities.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Oceanography
C. DeFrancesco, C. Gueguen
Summary: A study conducted over an 11-year period investigated the influence of sea ice concentration on the quality and quantity of CDOM and FDOM in central Canada Basin waters. Results showed that low ice years led to decreased fluorescence intensity and abundances of humic material, while high ice years had the opposite effect. Additionally, an increase in proteinaceous and terrigenous characteristics of FDOM was observed in UPML and LPML during the study period.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Shizhu Wang, Qiang Wang, Qi Shu, Zhenya Song, Gerrit Lohmann, Sergey Danilov, Fangli Qiao
Summary: The freshwater storage capability of the Arctic Ocean varies nonmonotonically with sea ice decline, leading to accumulation of freshwater in the Amerasian Basin and reduction in Eurasian and Amerasian basins. The increase in river runoff modulates the balance between these two effects.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Marine
Xiaoxia Cai, Yanpei Zhuang, Hongliang Li, Jing Xu, Haiyan Jin, Jianfang Chen
Summary: The optical properties of colored dissolved organic matter (CDOM) in the upper water of the western Arctic Ocean were studied. The study found a decoupling effect between CDOM concentration and biological productivity, and an increase in DOM molecular weight with salinity. Four fluorescent components were identified, with C3 and C4 components being associated with Pacific water inflow.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
J. Blake Clark, Antonio Mannino, Robert G. M. Spencer, Suzanne E. Tank, James W. Mcclelland
Summary: Long-term increases in Arctic river discharge have been observed, and there are positive correlations between dissolved organic carbon (DOC) concentration, river discharge, and chromophoric dissolved organic matter (CDOM) content in the largest Arctic rivers. The study estimated chromophoric DOC (CDOC) concentrations in six Arctic rivers using data collected from 2009 to 2019. The modeled results showed an increase in DOC and CDOC exports, with CDOC increasing at a faster rate than total DOC.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Oceanography
M. Gamrani, J. Eert, W. J. Williams, C. Gueguen
Summary: The study investigates the distribution and dynamics of dissolved organic matter (DOM) in the central Arctic Ocean, focusing on the impact of the Transpolar Drift (TPD) on DOM transport. Fluorescence measurements and spectroscopic analysis show significant differences in DOM composition between the Makarov Basin and the adjacent Canada Basin, which is likely due to the influx of Siberian runoff. The study also estimates the annual flux of humic-like material transported to the Atlantic through Fram Strait.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Environmental Sciences
Mi Hae Jeon, Jinyoung Jung, Mi Ok Park, Kyoung-Ho Cho, Youngju Lee, Eun Jin Yang, Sung-Ho Kang
Summary: This study investigates the impacts of environmental changes on dissolved organic matter (DOM) characteristics in the rapidly changing Arctic Ocean. By analyzing seawater samples collected in 2019, the study identifies high intensities of humic-like and tryptophan-like FDOM in specific layers, with the former originating from shelf sediment and the latter potentially from river discharge. The study suggests that future increase in river discharge may further impact DOM dynamics in the western Arctic Ocean.
FRONTIERS IN MARINE SCIENCE
(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
Limnology
Brianna C. Stanley, Rachel E. Sipler, Quinn N. Roberts, Jenna L. Spackeen, E. Zane Norton, Deborah A. Bronk
Summary: With the increase in temperatures and open water days in the Arctic, productivity is expected to rise, making the coastal shelves of the Arctic Ocean potential sinks for atmospheric carbon. However, the availability of nitrogen (N) is crucial for this storage, and there is limited literature on the rates of N uptake in this region. This study investigated the utilization of inorganic and organic N substrates by the aquatic microbial community in the Alaskan Arctic during late summer, revealing variations in uptake rates and the importance of different N sources for primary production.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
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
Geosciences, Multidisciplinary
David Clemens-Sewall, Chris Polashenski, Markus M. Frey, Christopher J. Cox, Mats A. Granskog, Amy R. Macfarlane, Steven W. Fons, Julia Schmale, Jennifer K. Hutchings, Luisa von Albedyll, Stefanie Arndt, Martin Schneebeli, Don Perovich
Summary: The amount of snow lost into Arctic leads was measured in winter 2020, revealing minimal snow loss under typical winter conditions. However, during a cyclone with warm air temperatures, high winds, and snowfall, a significant amount of snow was lost. This suggests that warm air temperatures may be an important factor in snow loss into leads.
GEOPHYSICAL RESEARCH LETTERS
(2023)
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
Multidisciplinary Sciences
Hiroshi Sumata, Laura de Steur, Dmitry V. Divine, Mats A. Granskog, Sebastian Gerland
Summary: Continuous monitoring of Arctic sea ice over the past three decades reveals a shift in 2007 from thicker and deformed ice cover to thinner and more uniform ice cover. This shift was preceded by a reduction in the residence time of sea ice in the Arctic Basin, which can be explained by a stochastic process of dynamic sea ice thickening. The study highlights the long-lasting impact of climate change on Arctic sea ice through reduced residence time and its connection to ocean-sea ice processes.
Review
Oceanography
Hakon Sandven, Borge Hamre, Tristan Petit, Ruediger Roettgers, Hongbo Liu, Mats A. Granskog
Summary: Hydrographic and bio-optical measurements were conducted in the northwestern Barents Sea shelf from spring to summer 2021, capturing the rapid changes brought by climate change. The study revealed the seasonal evolution of the marine environment, from winter conditions with sea ice cover to late summer with largely retreated sea ice. Phytoplankton played a key role in the spatial and temporal variability of optical properties, while resuspended particles contributed to increased scattering and absorption in the bottom boundary layer. The study suggested the development of specific models to account for light adaptations in ice-covered waters and highlighted the significance of particulate organic carbon as an alternative indicator for optical properties in ice-covered open ocean.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Zhi-Lun Zhang, Feng-Ming Hui, Timo Vihma, Mats A. Granskog, Bin Cheng, Zhuo-Qi Chen, Xiao Cheng
Summary: This study compares satellite and reanalysis data to evaluate turbulent heat flux calculations using different methods. The results show that the bulk-aerodynamic formula based approach performs better, while the maximum entropy production approach is comparable to ERA5 reanalysis. Furthermore, errors in surface and near-surface temperature and humidity account for 50% of the uncertainties in the bulk formula-based estimates, while errors in net radiative fluxes explain more than 50% of the uncertainties in the MEP-based results.
ADVANCES IN CLIMATE CHANGE RESEARCH
(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
Environmental Sciences
Laura de Steur, Hiroshi Sumata, Dmitry V. Divine, Mats A. Granskog, Olga Pavlova
Summary: According to ocean temperature observations in the Fram Strait from 2003 to 2019, sea ice cover along Greenland's east coast has decreased due to a warming Arctic outflow and more returning warm Atlantic water. The decline in sea ice extent and thickness in the Arctic Ocean has had significant consequences for the heat content of the Arctic Ocean and the watermasses flowing out from the Arctic.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Ecology
Bronwyn E. Cahill, Piotr Kowalczuk, Lena Kritten, Ulf Graewe, John Wilkin, Juergen Fischer
Summary: This study investigates the contribution of optically significant water constituents (OSCs), such as phytoplankton and coloured dissolved organic matter (CDOM), to the seasonal modulation of thermal energy fluxes across the ocean-atmosphere interface in the western Baltic Sea. It finds that phytoplankton and CDOM both contribute to surface heating in summer, with phytoplankton dominating in spring and CDOM dominating in autumn. The study highlights the impact of seasonal and spatial changes in OSCs on radiative heating and energy fluxes in the water column.
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
Oceanography
Alyssa M. LeClaire, Eric N. Powell, Roger Mann, Kathleen M. Hemeon, Sara M. Pace, Vincent Saba, Hubert du Pontavice, Jillian R. Sower
Summary: Arctica islandica is an important species for recording climate change on the U.S. northeast continental shelf, and its growth rates show synchronous changes with cold and warm climatic periods. This study finds that A. islandica near the Delmarva Peninsula had higher growth rates during cold periods, possibly due to increased food supply in shallower water. The range recession of this species is a long-term process determined by the survivorship of older individuals.
CONTINENTAL SHELF RESEARCH
(2024)
