Article
Oceanography
Cecilia Bertosio, Christine Provost, Marylou Athanase, Nathalie Sennechael, Gilles Garric, Jean-Michel Lellouche, Joo-Hong Kim, Kyoung-Ho Cho, Taewook Park
Summary: This study examines the evolution of halocline waters in the Makarov Basin and along the East Siberian continental slope from 2007 to 2020. It finds that Atlantic-derived lower halocline waters have been progressing eastward, leading to a strengthening of boundary currents and the shedding of mesoscale eddies. The increasing contribution from Atlantic waters has weakened the halocline, suggesting a new Arctic Ocean regime extending into the Amerasian Basin.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
D. Kim, E. -J Yang, S. Cho, H. -J Kim, K. -H Cho, J. Jung, S. -H Kang
Summary: The study investigated the aragonite saturation state in the surface waters of the western Arctic Ocean over a three-year period, showing that the East Siberian marginal area (ESMA) had higher average aragonite saturation levels than the Chukchi marginal area (CMA), indicating less severe ocean acidification in ESMA compared to CMA.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Ahra Mo, Dongseon Kim, Eun Jin Yang, Jinyoung Jung, Young Ho Ko, Sung-Ho Kang, Kyoung-Ho Cho, Keyhong Park, Tae-Wook Kim
Summary: This study evaluated interannual variation in the subsurface aragonite undersaturation zone in the Pacific Arctic Ocean. The upper boundary of the zone was primarily influenced by corrosive Pacific water and the intensity of the Beaufort Gyre associated with freshwater accumulation. The lower boundary was determined by contributions from both Pacific and Atlantic water, and an anomalous atmospheric circulation event in 2017 resulted in a decrease in the thickness of the undersaturation layer.
MARINE POLLUTION BULLETIN
(2022)
Article
Oceanography
Salar Karam, Celine Heuze, Vasco Mueller, Yixi Zheng
Summary: Based on hydrographic profiles in the Arctic Ocean, it is found that Canada Basin Deep Water (CBDW), which is relatively warm and salty, flows intermittently into the Amundsen Basin along the Gakkel Ridge. The driving mechanisms for CBDW inflow into the Amundsen Basin remain unclear, but density-driven overflows and pressure gradient across the Lomonosov Ridge are suggested to be unlikely drivers. Furthermore, multiple deep eddies containing CBDW are discovered in the Amundsen Basin, indicating the efficient trapping and transport of CBDW over long distances.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Oceanography
Eiji Watanabe, Jonaotaro Onodera, Motoyo Itoh, Kohei Mizobata
Summary: The study investigated the processes of seafloor sediment transport from the Chukchi shelf to the western Arctic basin. It found that the Barrow Canyon throughflow, Chukchi Slope Current, and mesoscale eddies played important roles in the redistribution of lithogenic material. The study also revealed that the lateral transport of sediment from the Chukchi shelf bottom significantly influenced the sinking flux of particulate organic carbon in the western Arctic basin, indicating the strong influence of shelf-basin exchange on the marine biogeochemical cycle.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Cheng-long Li, Yingxu Wu, Kui Chen, Hongmei Lin, Liqi Chen, Di Qi
Summary: This study investigates the distribution and drivers of ocean acidification (OA) metrics in the western North Pacific region by providing high-frequency and high-precision measurements of sea surface pCO2 and pH. The results show that surface pH is regulated by sea surface temperature, air-sea gas exchange, and vertical mixing, while the distribution of Ω is mainly controlled by air-sea gas exchange, vertical mixing, and temperature. Biological activity influences both pH and Ω, reinforcing their latitudinal patterns.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Oceanography
Colin A. Stedmon, Rainer M. W. Amon, Dorothea Bauch, Astrid Bracher, Rafael Goncalves-Araujo, Mario Hoppmann, Richard Krishfield, Samuel Laney, Benjamin Rabe, Heather Reader, Mats A. Granskog
Summary: This study highlights the potential of dissolved organic matter (DOM) as a tracer in the Arctic Ocean, particularly in the halocline layer. By measuring the fluorescence levels of DOM, distinct contributions from different sources can be distinguished and help evaluate ocean circulation patterns.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geochemistry & Geophysics
David C. Mosher, Kai Boggild
Summary: The Canada Basin Abyssal Plain in the Arctic Ocean appears flat and featureless, but is influenced by deep ocean geostrophic currents. Features near the Alaska-Beaufort margin suggest a mixed system affected by cyclonic flowing geostrophic currents, likely formed during glaciations and lower sea level stands.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Environmental Sciences
Katarzyna Zamelczyk, Agneta Fransson, Melissa Chierici, Elizabeth Jones, Julie Meilland, Griselda Anglada-Ortiz, Helene Hodal Lodemel
Summary: This study provides information on planktic foraminifera and shelled pteropods abundance, species composition, and vertical distribution in the Arctic Ocean during the polar night. These calcifying groups are important indicators of ocean acidification, with different distribution patterns in various water masses.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Meteorology & Atmospheric Sciences
Elizabeth C. Fine, Julie L. McClean, Detelina P. Ivanova, Anthony P. Craig, Alan J. Wallcraft, Eric P. Chassignet, Elizabeth C. Hunke
Summary: In the last decades, the Arctic climate has undergone significant changes, including the loss of multiyear sea ice. Accurate short-term prediction and long-term climate projection of the Arctic climate remain challenging.
Article
Geosciences, Multidisciplinary
Yingxu Wu, Di Qi, Zhangxian Ouyang, Lu Cao, Richard A. Feely, Hongmei Lin, Wei-Jun Cai, Liqi Chen
Summary: The distribution of OA metrics [H+], pH, and ω(arag) is influenced by temperature and biological activity, with sea-ice melt affecting the ω(arag)-temperature relationship. This study provides a comprehensive assessment of OA metrics across large spatial regions for the first time.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
B. Rogalla, S. E. Allen, M. Colombo, P. G. Myers, K. J. Orians
Summary: Biogeochemical cycles in the Arctic Ocean are sensitive to the transport of materials from continental shelves into central basins by sea ice. Manganese (Mn) is an important micronutrient and tracer, and sea ice is the main source of Mn in the Canada Basin while rivers contribute less. The vulnerability of biogeochemical supply mechanisms in the Arctic Ocean and subpolar seas to climate change is highlighted.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Oceanography
Samuel Brenner, Jim Thomson, Luc Rainville, Laura Crews, Craig M. Lee
Summary: Observations of sea ice and the upper ocean from moorings in the Beaufort Sea show that sea ice damps momentum transfer from wind to the ocean, resulting in minimal strength of inertial oscillations under sea ice cover. The presence of sea ice does not impact the net Ekman transport. A simplified one-dimensional ice-ocean coupled model reveals that both sea ice internal stress and ocean mixed layer depth contribute to the seasonal variability of inertial surface currents and drift, while under-ice roughness has no effect. The importance of internal stress in damping inertial oscillations varies at different moorings.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2023)
Article
Geosciences, Multidisciplinary
Rebecca A. Woodgate, Cecilia Peralta-Ferriz
Summary: The study reveals that the flow through the Bering Strait has been increasing since 1990, resulting in a reduction in Chukchi residence times, longer duration of warm waters in the Arctic, and winter waters becoming fresher. These changes may have implications for Arctic ecosystems and underwater mixing.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Silvia Amaya-Vias, Susana Flecha, Fiz F. Perez, Gabriel Navarro, Jesus Garcia-Lafuente, Ahmed Makaoui, I. Emma Huertas
Summary: The study examines the temporal trends of seawater pH and saturation state of calcium carbonate minerals in different water masses in the Atlantic and Mediterranean oceans. The findings show a gradual reduction in pH and saturation state, indicating increasingly unfavorable conditions for calcifying organisms. Future projections suggest critical conditions for calcium carbonate minerals will be reached by the end of the century, with a corrosive environment expected after 2100.
FRONTIERS IN MARINE SCIENCE
(2023)