Distributions of aluminum, manganese, cobalt, and lead in the western South Pacific: Interplay between the South and North Pacific

Zheng, Linjie; Minami, Tomoharu; Takano, Shotaro; Sohrin, Yoshiki

doi:10.1016/j.gca.2022.10.022

Cited by 12 publications

(3 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high abundance of Mn‐Fe nodules and crusts on the Pacific seafloor serves as evidence for the oxidation and removal of Fe and Mn from the water column, and these nodules can adsorb other elements, including Co, Cu, and Ni (Shaw et al., 1990). Based on the sedimentary Mn fluxes (Tables 4 and 5) and the Pacific Ocean distribution of dissolved and labile particulate Mn (Zheng et al., 2019, 2022), it is suggested that Mn is diffusing from the sediment to the bottom water, where it forms labile particulates that accumulate on top of the sediment. Settling of Mn oxides from the upper ocean is another source of particulate Mn to the top sediments, which might be the dominant one.…”

Section: Discussionmentioning

confidence: 99%

“…The high abundance of Mn-Fe nodules and crusts on the Pacific seafloor serves as evidence for the oxidation and removal of Fe and Mn from the water column, and these nodules can adsorb other elements, including Co, Cu, and Ni (Shaw et al, 1990). Based on the sedimentary Mn fluxes (Tables 4 and 5) and the Pacific Ocean distribution of dissolved and labile particulate Mn (Zheng et al, 2019(Zheng et al, , 2022, it is suggested that Mn is Average river dissolved and particulate concentrations from Martin and Whitfield (1983). c…”

Section: Benthic Fluxesmentioning

confidence: 99%

See 1 more Smart Citation

Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water‐Column Studies

Steiner,

Antler,

Berelson

et al. 2023

Global Biogeochemical Cycles

View full text Add to dashboard Cite

Geochemical analyses of trace elements in the ocean water column have suggested that pelagic clay‐rich sediments are a major source of various elements to bottom‐waters. However, corresponding high‐quality measurements of trace element concentrations in porewaters of pelagic clay‐rich sediments are scarce, making it difficult to evaluate the contributions from benthic processes to global oceanic cycles of trace elements. To bridge this gap, we analyzed porewater and bulk sediment concentrations of vanadium, chromium, cobalt, nickel, copper, arsenic, molybdenum, barium and uranium, as well as concentrations of the major oxidants nitrate, manganese, iron, and sulfate in the top 30 cm of cores collected along a transect from Hawaii to Alaska. The data show large increases in porewater concentrations of vanadium, manganese, cobalt, nickel, copper, and arsenic within the top cm of the sediment, consistent with the release of these elements from remineralized organic matter. The sediments are a sink for sulfate, uranium, and molybdenum, even though conditions within the sampled top 30 cm remain aerobic. Porewater chromium concentrations generally increase with depth due to release from sediment particles. Extrapolated to the global aerial extent of pelagic clay sediment, the benthic fluxes in mol yr−1 are Ba 3.9 ± 3.6 × 109, Mn 3.4 ± 3.5 × 108, Co 2.6 ± 1.3 × 107, Ni 9.6 ± 8.6 × 108, Cu 4.6 ± 2.4 × 109, Cr 1.7 ± 1.1 × 108, As 6.1 ± 7.0 × 108, V 6.0 ± 2.5 × 109. With the exception of vanadium, calculated fluxes across the sediment–water interface are consistent with the variability in bottom‐water concentrations and ocean residence time of the studied elements.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Benthic Fluxesmentioning

confidence: 99%

Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water‐Column Studies

Steiner,

Antler,

Berelson

et al. 2023

Global Biogeochemical Cycles

View full text Add to dashboard Cite

show abstract

“…Mn is an essential micronutrient for photosynthesis and the normal function of enzymes in cells of phytoplankton (Gerringa et al, 2020). Furthermore, both Al and Mn can be used for tracing water masses mixing (Measures and Edmond, 1990;Statham et al, 1998;Zheng et al, 2022) and external sources, e.g., continental inputs (Slemons et al, 2010;Menzel Barraqueta et al, 2018;Kandel and Aguilar-Islas, 2021) and hydrothermal inputs (Resing et al, 2015;Lee et al, 2018). Mn is also used as a chemical tracer for understanding changes in the redox environment (Lenstra et al, 2020) in the ocean due to its variable valence.…”

Section: Introductionmentioning

confidence: 99%

Processes controlling the distributions and cycling of dissolved aluminum and manganese in the northeastern Indian Ocean

Yang

Ren

et al. 2023

Front. Mar. Sci.

View full text Add to dashboard Cite

Aluminum and manganese are both key parameters in the GEOTRACES program. Data on dissolved aluminum (dAl) and dissolved manganese (dMn) relative to their geochemical behavior remain limited in the northeastern Indian Ocean (IO; including the Bay of Bengal (BoB) and equatorial Indian Ocean (Eq. IO)). Seawater samples collected in the BoB and Eq. IO during the spring inter-monsoon period (7 March to 9 April) of 2017 were analyzed to investigate the behavior and main processes controlling the distributions of dAl and dMn in the northeastern IO. The average concentrations of dAl and dMn in the mixed layer of the BoB were 16.6 and 6.7 nM, respectively. A modified 1-D box-model equation was utilized to estimate the contributions of different sources to dAl and dMn in the mixed layer. Al released from the desorption of and/or dissolution of the lithogenic sediments discharged by the Ganga–Brahmaputra (G-B) river system predominantly controlled the dAl distributions in the mixed layer of the BoB, while the desorption from the lithogenic sediments only contributed approximately 13%–21% dMn. Additional dMn input from the advection of Andaman Sea water and photo-reduction–dissolution of particulate Mn(IV) contributed more than 60% dMn in the mixed layer of the BoB. dAl and dMn in the surface mixed layer of the Eq. IO were mainly affected by the mixing of dAl- and dMn-enriched BoB surface water and low-dAl, low-dMn southern Arabian Sea surface water. Considering water mass properties and dAl concentrations, the distributions of dAl in the intermediate water (750–1,500 m) of northeastern IO were controlled by the mixing of Red Sea Intermediate Water, Indonesian Intermediate Water, and intermediate water of the BoB. Different from dAl, the apparent oxygen utilization relationship with dMn concentrations indicated that the regeneration of lithogenic particles under hypoxic conditions played a more important role than the remineralization of settling organic particles in controlling dMn distributions in the subsurface and intermediate water body (100–1,000 m) of the BoB and that remineralization of biogenic particles mattered to dMn in the subsurface of the Eq. IO.

show abstract

The behaviour of aluminium, manganese, iron, cobalt, and lead in the subarctic Pacific Ocean: boundary scavenging and temporal changes

Chan,

Zheng,

Sohrin

2024

J Oceanogr

View full text Add to dashboard Cite

Aluminium (Al), manganese (Mn), iron (Fe), cobalt (Co), and lead (Pb) are trace metals that exhibit significant scavenging tendencies in the oceans. This study presents the full-depth distributions of the dissolved (d) and labile particulate (lp) fractions of these five elements in the subarctic Pacific Ocean, obtained during the GEOTRACES Japan KH-17-3 cruise. Along the 145° W meridional transect, the d and lp species of Al, Mn, Fe, and Co reflected fluvial supply from Alaska and benthic input from the continental shelf. We estimated that the boundary-scavenging zone has a width of approximately 250 km off Alaska. Along the 47° N zonal transect (GEOTRACES GP02 Line), we found input of trace metals from the Okhotsk and Bering Seas in the west, contrasting to the limited input of trace metals due to boundary scavenging in the east. The hydrothermal activity of the Juan de Fuca Ridge influenced the distribution of deep-water trace metals at the easternmost station, CL-21. Temporal change in the vertical profiles of dPb in the middle of the subarctic gyre highlighted a decline in anthropogenic Pb emissions from 2005 to 2017. Temporal change of the vertical profiles of Al, Mn, and Fe at 47° N, 160° E from 2011 to 2017 indicates the influence of the Great East Japan Earthquake. In particular, lp trace metals were brought by tsunami and ocean circulation in 2011, and decreased over time through scavenging.

show abstract

Distributions of aluminum, manganese, cobalt, and lead in the western South Pacific: Interplay between the South and North Pacific

Cited by 12 publications

References 77 publications

Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water‐Column Studies

Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water‐Column Studies

Processes controlling the distributions and cycling of dissolved aluminum and manganese in the northeastern Indian Ocean

The behaviour of aluminium, manganese, iron, cobalt, and lead in the subarctic Pacific Ocean: boundary scavenging and temporal changes

Contact Info

Product

Resources

About