Transport Processes of Seafloor Sediment From the Chukchi Shelf to the Western Arctic Basin DOI
Eiji Watanabe, Jonaotaro Onodera, Motoyo Itoh

et al.

Journal of Geophysical Research Oceans, Journal Year: 2022, Volume and Issue: 127(4)

Published: March 31, 2022

Abstract The processes of seafloor sediment transport from the Chukchi shelf to western Arctic basin were investigated using a pan‐Arctic sea ice‐ocean model and sediment‐trap measurements at four mooring stations: North Barrow Canyon, Hanna Northwind Abyssal Plain, Plain. available data verified that sinking flux lithogenic material (LM) originally resuspended for 2010–2020 was simulated reasonably well in areas. results analyzed quantify spatiotemporal variability LM reveal its background mechanisms. Analysis indicated Canyon throughflow, Slope Current (CSC), mesoscale eddies played important roles redistribution. CSC controlled westward mouth Borderland. generated north efficiently transported shelf‐origin toward southern Canada Basin. particulate organic carbon (POC) averaged September 2010 August 2020, which estimated statistically flux, 0.13–0.30 gC m −2 yr −1 200‐m depth This finding reveals lateral bottom has considerable effect on POC basin, suggests marine biogeochemical cycle is strongly influenced by shelf‐basin exchange depends relative strength eddy activity.

Language: Английский

Particulate trace element distributions along the Canadian Arctic GEOTRACES section: shelf-water interactions, advective transport and contrasting biological production DOI
Manuel Colombo, Jingxuan Li, Birgit Rogalla

et al.

Geochimica et Cosmochimica Acta, Journal Year: 2022, Volume and Issue: 323, P. 183 - 201

Published: Feb. 17, 2022

Language: Английский

Citations

15
Biotic transformation of methylmercury at the onset of the Arctic spring bloom DOI Creative Commons
Stephen G. Kohler, Lars‐Éric Heimbürger‐Boavida, Philipp Assmy

et al.

Progress In Oceanography, Journal Year: 2024, Volume and Issue: 222, P. 103224 - 103224

Published: Feb. 18, 2024

Despite the lack of local anthropogenic mercury sources, methylated (MeHg) concentrations in Arctic biota are higher than from lower latitudes. The main entry route occurs during bioconcentration seawater monomethylmercury (MMHg) into phytoplankton. known seasonal changes biological activity region, little is about cycling total (THg) and MeHg Ocean. Here, we report THg sampled northwestern Barents Sea water column late winter spring. In upper 500 m, significantly spring (0.64 ± 0.09 pmol L-1) compared to (0.53 0.07 L-1), driven by inputs surface waters atmospheric deposition dynamics changing sea ice conditions. Contrastingly, were (41 39 fmol (85 42 L-1). We suggest that most biotically demethylated both phytoplankton bacteria, with additional losses photodemethylation evasion. Our observations highlight importance demethylation potential uptake methylmercury coinciding bloom. Lastly, use our new data together previously published region construct a simplified cycle an marginal zone.

Language: Английский

Citations

3
An Ocean of Particles Characterization of Particulate Trace Elements by the GEOTRACES Program DOI Creative Commons
Benjamin S. Twining

Oceanography, Journal Year: 2024, Volume and Issue: 37(2)

Published: Jan. 1, 2024

The GEOTRACES program has greatly expanded measurements of trace elements, which serve as key nutrients, harmful contaminants, and tracers ocean processes past conditions. Many elements tend to associate with particulate matter, been particularly valuable for growing our understanding this fraction. Focusing on the micronutrient iron an example, data demonstrate that majority in is particulate. Chemically labile iron, likely available biological use, also often more abundant than dissolved forms, near continents deep sea. This highlights need consider fraction conceptual numeric models. Direct comparisons particle-sampling methods highlight both abundance small particles (<0.45–0.8 μm), whose biogeochemical roles are still poorly known, difficulty consistently capturing large, faster-sinking particles. In situ pumps 0.8 μm filters capture less bottle-collected samples filtered onto 0.45 filters, but they can material some sources. datasets contain nearly sevenfold measurements, ongoing efforts pair these needed order fully understand cycles other important elements.

Language: Английский

Citations

3
Spatial and seasonal variations in suspended particulate matter concentration and composition in the Persian Gulf: From dust deposition and sediment resuspension to biological production in the regulation of the particulate trace elements DOI
Hamid Ershadifar, Abolfazl Saleh, Kamalodin Kor

et al.

Marine Pollution Bulletin, Journal Year: 2024, Volume and Issue: 203, P. 116504 - 116504

Published: May 23, 2024

Language: Английский

Citations

3
Transport Processes of Seafloor Sediment From the Chukchi Shelf to the Western Arctic Basin DOI
Eiji Watanabe, Jonaotaro Onodera, Motoyo Itoh

et al.

Journal of Geophysical Research Oceans, Journal Year: 2022, Volume and Issue: 127(4)

Published: March 31, 2022

Abstract The processes of seafloor sediment transport from the Chukchi shelf to western Arctic basin were investigated using a pan‐Arctic sea ice‐ocean model and sediment‐trap measurements at four mooring stations: North Barrow Canyon, Hanna Northwind Abyssal Plain, Plain. available data verified that sinking flux lithogenic material (LM) originally resuspended for 2010–2020 was simulated reasonably well in areas. results analyzed quantify spatiotemporal variability LM reveal its background mechanisms. Analysis indicated Canyon throughflow, Slope Current (CSC), mesoscale eddies played important roles redistribution. CSC controlled westward mouth Borderland. generated north efficiently transported shelf‐origin toward southern Canada Basin. particulate organic carbon (POC) averaged September 2010 August 2020, which estimated statistically flux, 0.13–0.30 gC m −2 yr −1 200‐m depth This finding reveals lateral bottom has considerable effect on POC basin, suggests marine biogeochemical cycle is strongly influenced by shelf‐basin exchange depends relative strength eddy activity.

Language: Английский

Citations

14