Article
Oceanography
Emma J. Bullock, Lauren Kipp, Willard Moore, Kristina Brown, Paul J. Mann, Jorien E. Vonk, Nikita Zimov, Matthew A. Charette
Summary: This study quantifies the river radium inputs into the Arctic Ocean for the first time and improves the estimates for this region. Through lab experiments and data from major rivers around the world, it is found that rivers are an important source of radium to the Arctic Ocean. Understanding river radium inputs is crucial for studying changes in biogeochemically important element fluxes as climate change and Arctic warming continue.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geochemistry & Geophysics
Xue-Gang Chen, Dagmara Rusiecka, Martha Gledhill, Angela Milne, Amber L. Annett, Aaron Joseph Beck, Antony J. Birchill, Maeve C. Lohan, Simon Ussher, Eric P. Achterberg
Summary: This article reports the spatial and seasonal distributions of dissolved trace metals (dTMs) including iron (Fe), manganese (Mn), and cobalt (Co) on the Northeast Atlantic continental margin (Celtic Sea). The study found that waters on the continental shelf had much higher dTM concentrations than on the slope, attributed to strong contributions from riverine discharge. The combined effects of fluvial and benthic sources, topographical controls, and biological processes shape the seasonal variations of dTM distributions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Engineering, Marine
Boris Radosavljevic, Hugues Lantuit, Christian Knoblauch, Nicole Couture, Ulrike Herzschuh, Michael Fritz
Summary: Increasing coastal erosion rates in the Arctic lead to a greater release of sediments and organic matter into the coastal zone. Research conducted on sediment samples from the nearshore area showed higher organic carbon content. The study suggests that degradation of organic matter and separation of carbon pools occur on land and continue in the nearshore zone.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Oceanography
Laramie T. Jensen, Jay T. Cullen, Sarah L. Jackson, Loes J. A. Gerringa, Dorothea Bauch, Rob Middag, Robert M. Sherrell, Jessica N. Fitzsimmons
Summary: Recent studies have revealed a unique linear relationship between dissolved copper (Cu) and nickel (Ni) in the Arctic Ocean, which differs from other oceans. This relationship is driven by river inputs and shows distinct distribution patterns in surface and deep waters. Cu and Ni mainly originate from rivers, but Ni is additionally influenced by biological processes and shelf sediment processes, while Cu is mostly affected by mixing.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Laramie T. Jensen, Nathan T. Lanning, Chris M. Marsay, Clifton S. Buck, Ana M. Aguilar-Islas, Robert Rember, William M. Landing, Robert M. Sherrell, Jessica N. Fitzsimmons
Summary: The surface waters of the Arctic Ocean include an important inventory of freshwater from rivers, sea ice melt, and glacial meltwaters. Different metals exhibit varying concentrations and impacts as colloids in different cryospheric reservoirs.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Oceanography
Jessica S. Dabrowski, Robert S. Pickart, Dean A. Stockwell, Peigen Lin, Matthew A. Charette
Summary: Climate change is causing the loss of sea ice in the Arctic, resulting in the increase of materials from continental shelves into the Arctic Ocean. The interaction between sediment and water can chemically transform water, enriching it in nutrients and carbon, which can affect primary productivity and greenhouse gas cycling. However, the mechanisms driving sediment-water interaction in the Arctic Ocean are not well understood.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Environmental Sciences
Evgeny Yakovlev, Andrey Puchkov, Alexey Malkov, Daria Bedrina
Summary: This article focuses on the content of heavy metals in the bottom sediments of the estuary of the Pechora River. The study found that the concentrations of heavy metals in the sediments are low, indicating a low level of environmental risk.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Ricardo S. Matias, Hugo R. Guimaro, Paco Bustamante, Jose Seco, Nesho Chipev, Joana Fragao, Silvia Tavares, Filipe R. Ceia, Maria E. Pereira, Andres Barbosa, Jose C. Xavier
Summary: Under the context of climate change, warming Southern Ocean waters may lead to increased bioavailability of mercury (Hg) in the Antarctic marine food web. This study examined the biomagnification of Hg in the food web of the Antarctic Peninsula and found that Hg concentrations increased with trophic levels. These results suggest that trophic interaction is the major pathway for Hg biomagnification in Southern Ocean ecosystems.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geosciences, Multidisciplinary
Jochen Knies
Summary: This work reports on the coupling of dinitrogen fixation and denitrification in oxygen-deficient waters of the Arctic Ocean during the Paleogene. The coupling fertilized marine phytoplankton growth and favored organic carbon burial. The study also indicates a shift in the main source of biologically available nitrogen due to changing nutrient availability and suggests that the Arctic Ocean has been fully ventilated since the early Neogene.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Manuel Colombo, Birgit Rogalla, Jingxuan Li, Susan E. Allen, Kristin J. Orians, Maria T. Maldonado
Summary: Research shows that the Canadian Arctic Archipelago region's sediment resuspension and sediment-water interactions result in the enrichment of iron in water bodies, which are then transported to Baffin Bay, providing crucial support for primary production and nitrogen fixation in the region and beyond.
GLOBAL BIOGEOCHEMICAL CYCLES
(2021)
Article
Multidisciplinary Sciences
Joan De Vera, Priyanka Chandan, Paulina Pinedo-Gonzalez, Seth G. John, Sarah L. Jackson, Jay T. Cullen, Manuel Colombo, Kristin J. Orians, Bridget A. Bergquist
Summary: The study reveals that anthropogenic lead is widespread and dominant in the western Arctic Ocean, with significant contributions from historic aerosol lead deposited from Europe and Russia during the 20th century. The remobilization of this lead, especially in water layers with higher concentrations, highlights the impact of human activities and environmental changes on the Arctic. Detecting 20th century Eurasian lead in deep water also provides insights into ventilation ages and helps constrain sources of contaminants in Arctic seawater.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geography, Physical
M. Alam, M. Tripti, G. P. Gurumurthy, Y. Sohrin, M. Tsujisaka, A. D. Singh, S. Takano, K. Verma
Summary: The study investigates the oxygenation history of the northeastern Arabian Sea since the late Miocene using redox sensitive elemental and metal stable isotopic signatures in deep-sea sediments. The results indicate varying oxygenation conditions in the water column during different periods.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Wenshen Xiao, Leonid Polyak, Rujian Wang, Christelle Not, Linsen Dong, Yanguang Liu, Tong Ma, Taoliang Zhang
Summary: The sediment core ARC5-ICE6 from the Makarov Basin provides insights into circum-Arctic glaciation and surface-ocean circulation history during the Middle to Late Pleistocene. Sedimentary proxies indicate predominant sediment delivery from the Eurasian shelves and glaciated mainland, with large shifts in sediment inputs and provenance between glacial and interglacial periods since Marine Isotope Stage 6. Strong cyclonic circulation and different glaciogenic sourcing are proposed for various events within Marine Isotope Stages 5 and 3, with limited glacial influence inferred for Stage 3.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Oceanography
L. J. A. Gerringa, M. J. A. Rijkenberg, H. A. Slagter, P. Laan, R. Paffrath, D. Bauch, M. Rutgers van der Loeff, R. Middag
Summary: During the PS94 expedition in summer 2015, sources and sinks of dissolved metals in the central Arctic Ocean were studied, revealing different concentrations of metals in various regions, highlighting the importance of different water sources in influencing metal distributions.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Review
Environmental Sciences
Ioannis Karaouzas, Natalia Kapetanaki, Angeliki Mentzafou, Theodore D. Kanellopoulos, Nikolaos Skoulikidis
Summary: The overall heavy metal contamination status of surface water bodies in Greece generally meets environmental quality standards, but sediment heavy metal concentrations often exceed guidelines. A few rivers and lakes are moderately to highly contaminated by heavy metals.
Article
Green & Sustainable Science & Technology
A. W. Dale, S. Sommer, A. Lichtschlag, D. Koopmans, M. Haeckel, E. Kossel, C. Deusner, P. Linke, J. Scholten, K. Wallmann, M. R. van Erk, J. Gros, F. Scholz, M. Schmidt
Summary: A study investigated the biogeochemistry of sediments in the North Sea during a controlled subsurface CO2 release experiment at a potential carbon capture and storage site (Goldeneye). Results suggest that organic carbon at Goldeneye has a state of oxidation below zero and is primarily degraded through sulfate reduction processes.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Multidisciplinary Sciences
Casey M. S. Schine, Anne-Carlijn Alderkamp, Gert van Dijken, Loes J. A. Gerringa, Sara Sergi, Patrick Laan, Hans van Haren, Willem H. van de Poll, Kevin R. Arrigo
Summary: The primary production in the Southern Ocean is limited by iron availability, with hydrothermal vents identified as a potential source of iron. A significant phytoplankton bloom occurred in the Pacific sector of the Antarctic Circumpolar Current in January 2014, likely fueled by iron of hydrothermal origin.
NATURE COMMUNICATIONS
(2021)
Article
Oceanography
Robert S. Pickart, Michael A. Spall, Peigen Lin, Frank Bahr, Leah T. McRaven, Kevin R. Arrigo, Jacqueline M. Grebmeier
Summary: Through shipboard data and dynamical equations, a benthic hotspot with exceptionally high macrofaunal biomass in Barrow Canyon is explained, which is associated with strong northward flow and sharp density front in the canyon.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Limnology
Alex Cabral, Thorsten Dittmar, Mitchell Call, Jan Scholten, Carlos E. Rezende, Nils Asp, Martha Gledhill, Michael Seidel, Isaac R. Santos
Summary: Studies in the Amazon region using radium isotopes have shown that carbon in mangroves primarily comes from tidally driven groundwater exchange and is exported from the continental shelf on a timescale of 22±7 days. Bicarbonate is the main form of carbon in samples, with DIC outwelling exceeding DOC at all spatial scales.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2021)
Article
Limnology
Hannah L. Joy-Warren, Anne-Carlijn Alderkamp, Gert L. van Dijken, Loay Jabre, Erin M. Bertrand, Evan N. Baldonado, Molly W. Glickman, Kate M. Lewis, Rob Middag, Kyyas Seyitmuhammedov, Kate E. Lowry, Willem van de Poll, Kevin R. Arrigo
Summary: Light and iron availability are interconnected in controlling Southern Ocean primary production. Changes in light and iron can affect phytoplankton species composition and nutrient cycling. Light limits growth while iron does not, despite overall low iron concentrations.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Chemistry, Multidisciplinary
Kyyas Seyitmuhammedov, Claudine H. Stirling, Malcolm R. Reid, Robert van Hale, Patrick Laan, Kevin R. Arrigo, Gert van Dijken, Anne-Carlijn Alderkamp, Rob Middag
Summary: This study investigates the distribution of iron (Fe) in the Western Antarctic Peninsula (WAP) during early sea-ice retreat, finding increased Fe inputs from ice melt and sediments contributing to higher Fe concentrations in shelf waters. The research suggests that Fe from melting sea ice and shallow sedimentary sources can enhance phytoplankton productivity in WAP waters, especially in off-shelf regions with improved light conditions.
Letter
Multidisciplinary Sciences
F. Spielhagen Robert, Jan C. Scholten, Henning A. Bauch, Anton Eisenhauer
Article
Environmental Sciences
Catia Milene Ehlert von Ahn, Jan C. Scholten, Christoph Malik, Peter Feldens, Bo Liu, Olaf Dellwig, Anna-Kathrina Jenner, Svenja Papenmeier, Iris Schmiedinger, Mary A. Zeller, Michael Ernst Boettcher
Summary: This study characterizes and evaluates the hydrogeochemical gradients in the mixing zone of the Wismar Bay in the southern Baltic Sea, Germany, revealing that different fresh water sources, including SGD, contribute to the water balance of the bay. Enhanced concentrations of radium isotopes and other dissolved substances in surface waters indicate benthic-pelagic coupling and anthropogenic impacts on sediment layers.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Oceanography
Ouyang Zhangxian, Andrew Collins, Yun Li, Di Qi, Kevin R. Arrigo, Yanpei Zhuang, Shigeto Nishino, Matthew P. Humphreys, Naohiro Kosugi, Akihiko Murata, David L. Kirchman, Liqi Chen, Jianfang Chen, Wei-Jun Cai
Summary: The Chukchi Sea is becoming a larger sink for CO2 due to rapid climate changes. Understanding the seasonal variations in air-sea CO2 exchange and the biogeochemical dynamics is crucial for predicting the impacts of climate change on the ocean and the feedbacks. The study finds that thermal and non-thermal effects have different impacts on sea surface CO2 levels and air-sea CO2 flux in different water masses. The findings also highlight the importance of phytoplankton stoichiometry in CO2 uptake.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Limnology
Claudette Proctor, Pierre Coupel, Karen Casciotti, Jean-Eric Tremblay, Emily Zakem, Kevin R. Arrigo, Matthew M. Mills
Summary: This study found that light and sea ice concentration are important controls on nitrification in the Chukchi Sea, while high ammonium concentrations enhance nitrification. Unlike previous studies, nitrification rates were found to be higher under low pH conditions. These findings will guide future research on the implications of climate change on nitrogen biogeochemistry in the Chukchi Sea.
LIMNOLOGY AND OCEANOGRAPHY
(2023)
Article
Oceanography
Michael S. Dinniman, Pierre St-Laurent, Kevin R. Arrigo, Eileen E. Hofmann, Gert L. van Dijken
Summary: The upward advection or mixing of iron-rich deep waters driven by the rate of basal ice shelf melt is a primary control on chlorophyll a production in coastal polynyas over the Antarctic continental shelf. This study examined the effects of projected atmospheric changes in 2100 on this relationship using a 5-km resolution ocean/sea ice/ice shelf model. The modified atmospheric conditions resulted in increased heat advection onto the continental shelf, increased basal ice shelf melt, and increased dissolved iron supply to the surface waters.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Chemistry, Multidisciplinary
Sian F. Henley, Stefano Cozzi, Francois Fripiat, Delphine Lannuzel, Daiki Nomura, David N. Thomas, Klaus M. Meinersg, Martin Vancoppenollej, Kevin Arrigo, Jacqueline Stefels, Maria van Leeuwe, Sebastien Moreau, Elizabeth M. Jones, Agneta Fransson, Melissa Chierici, Bruno Delilleo
Summary: This study presents a new compilation of macronutrient concentration data in Antarctic land-fast sea ice, covering the full seasonal cycle. The research reveals a strong seasonal cycle of nutrient concentrations, with high levels in autumn and winter and utilization by ice algal communities in spring and summer. It also suggests a degree of nutrient limitation in ice algal primary production, with silicon limitation being the most prevalent. Various factors, such as brine convection and under-ice tidal currents, influence nutrient supply to fast ice.
Article
Environmental Sciences
Hannah L. Joy-Warren, Kate M. Lewis, Mathieu Ardyna, Jean-Eric Tremblay, Marcel Babin, Kevin R. Arrigo
Summary: As sea ice continues to decline rapidly in the Arctic, the adaptation of phytoplankton to different light conditions was investigated in this study. Three different light regimes – under the ice, in the marginal ice zone, and in open water – were examined during the Green Edge cruise in Baffin Bay in spring-summer 2016. The experiments conducted demonstrated that phytoplankton are well-prepared for a transition to high light conditions, even when originating from low light environments under sea ice.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2023)
Article
Environmental Sciences
Stephanie M. Lim, Courtney M. Payne, Gert L. van Dijken, Kevin R. Arrigo
Summary: Sea ice algae in the Arctic Ocean play a crucial role in primary production. Climate change-induced sea ice loss poses a threat to their persistence, but the replacement of multiyear ice with first-year ice might partially offset this threat and support ice algal growth.
ELEMENTA-SCIENCE OF THE ANTHROPOCENE
(2022)
Article
Environmental Sciences
Mathieu Ardyna, Douglas S. Hamilton, Tristan Harmel, Leo Lacour, Diana N. Bernstein, Julien Laliberte, Christopher Horvat, Remi Laxenaire, Matthew M. Mills, Gert van Dijken, Igor Polyakov, Herve Claustre, Natalie Mahowald, Kevin Robert Arrigo
Summary: The deposition of Siberian wildfire aerosols, containing nitrogen, enhanced phytoplankton growth in the eastern Eurasian Basin of the Arctic Ocean in summer 2014. This finding, supported by satellite-based ocean color data and atmospheric transport modeling, suggests that long range transport and deposition of wildfire aerosols can affect biogeochemical cycles in the Arctic Ocean.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Morgane Leon, Pieter van Beek, Virginie Sanial, Marc Souhaut, Paul Henderson, Matthew A. Charette
Summary: The analysis of radium and actinium isotopes in seawater requires the collection of large volumes of water and the use of high sensitivity instruments. To concentrate these isotopes, filters impregnated with MnO2 are typically used. However, the extraction efficiency of these filters for the target isotopes needs to be determined.