Sr Isotopic Composition of Suspended Particulate Material (SPM) of East Siberian Rivers: Sediment Transport to the Arctic Ocean

1997 ◽  
Vol 29 (4) ◽  
pp. 422 ◽  
Author(s):  
V. Rachold ◽  
A. Eisenhauer ◽  
H.-W. Hubberten ◽  
B. Hansen ◽  
H. Meyer
Keyword(s):  
Sediment Transport ◽  
Isotopic Composition ◽  
Arctic Ocean ◽  
Particulate Material ◽  
The Arctic ◽  
Suspended Particulate ◽  
The Arctic Ocean ◽  
Suspended Particulate Material

Sediment transport to the Arctic Ocean and adjoining cold oceans*

2006 ◽  
Vol 37 (4-5) ◽  
pp. 413-432 ◽  
Author(s):  
Bent Hasholt ◽  
Nelly Bobrovitskaya ◽  
Jim Bogen ◽  
James McNamara ◽  
Sebastian H. Mernild ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Arctic Ocean ◽  
Monitoring Network ◽  
High Arctic ◽  
Sediment Flux ◽  
The Arctic ◽  
Sediment Loads ◽  
The Arctic Ocean ◽  
Available Information ◽  
Total Sediment

This paper reviews and synthesises available information on sediment transport to the Arctic Ocean and adjoining seas with open contact to the Atlantic and Pacific Oceans. Special emphasis is placed on calculation and estimation of the sediment flux from the mostly ungauged high Arctic areas on the American continent, in Greenland, and on islands in the Arctic Ocean, and from Russia. In the absence of reliable information on bedload fluxes for most rivers, attention is directed primarily to suspended sediment loads. By combining available monitoring data and estimates for ungauged areas, the total sediment transport to the Arctic Ocean is estimated to be 324–884 × 106 t yr−1. Of this total, a maximum of about 56% can be considered as monitored, while the rest is based on different types of estimate. It is clearly demonstrated that the monitoring network in the high Arctic is inadequate and that there is a lack of knowledge concerning the proportion of the load that actually reaches the sea, as well as bedload.

scholarly journals New Constraints on the Physical and Biological Controls on the Silicon Isotopic Composition of the Arctic Ocean

2021 ◽  
Vol 8 ◽  
Author(s):  
Mark A. Brzezinski ◽  
Ivia Closset ◽  
Janice L. Jones ◽  
Gregory F. de Souza ◽  
Colin Maden
Keyword(s):  
Isotopic Composition ◽  
Arctic Ocean ◽  
Silicic Acid ◽  
Deep Water ◽  
Canada Basin ◽  
The Arctic ◽  
Silicon Isotope ◽  
Deep Waters ◽  
The Arctic Ocean ◽  
Source Waters

The silicon isotope composition of silicic acid, δ30Si(OH)4, in the deep Arctic Ocean is anomalously heavy compared to all other deep ocean basins. To further evaluate the mechanisms leading to this condition, δ30Si(OH)4 was examined on US GEOTRACES section GN01 from the Bering Strait to the North Pole. Isotope values in the polar mixed layer showed a strong influence of the transpolar drift. Drift waters contained relatively high [Si(OH)4] with heavy δ30Si(OH)4 consistent with the high silicate of riverine source waters and strong biological Si(OH)4 consumption on the Eurasian shelves. The maximum in silicic acid concentration, [Si(OH)4], within the double halocline of the Canada Basin formed a local minimum in δ30Si(OH)4 that extended across the Canada Basin, reflecting the high-[Si(OH)4] Pacific source waters and benthic inputs of Si(OH)4 in the Chukchi Sea. δ30Si(OH)4 became lighter with the increase in [Si(OH)4] in intermediate and deep waters; however, both Canada Basin deep water and Eurasian Basin deep water were heavier than deep waters from other ocean basins. A preliminary isotope budget incorporating all available Arctic δ30Si(OH)4 data confirms the importance of isotopically heavy inflows in creating the anomalous deep Arctic Si isotope signature, but also reveals a surprising similarity in the isotopic composition of the major inflows compared to outflows across the main gateways connecting the Arctic with the Pacific and the Atlantic. This similarity implies a major role of biological productivity and opal burial in removing light isotopes entering the Arctic Ocean from rivers.

scholarly journals Microfeatures of modern sea-ice-rafted sediment and implications for paleo-sea-ice reconstructions

2015 ◽  
Vol 56 (69) ◽  
pp. 83-93 ◽  
Author(s):  
Kristen St John ◽  
Sandra Passchier ◽  
Brooke TantillO ◽  
Dennis Darby ◽  
Lance Kearns
Keyword(s):  
Sediment Transport ◽  
Sea Ice ◽  
Arctic Ocean ◽  
Chemical Weathering ◽  
The Arctic ◽  
Discriminate Analysis ◽  
Glacial Ice ◽  
Coastal Marine ◽  
The Arctic Ocean ◽  
Glacial Processes

AbstractDistinguishing sea-ice-rafted debris (SIRD) from iceberg-rafted debris is crucial to an interpretation of ice-rafting history; however, there are few paleo-sea-ice proxies. This study characterizes quartz grain microfeatures of modern SIRD from the Arctic Ocean, and compares these results with microfeatures from representative glacial deposits to potentially differentiate SIRD from ice-rafted sediments which have been recently subjected to glacial processes. This allows us to evaluate the use of grain microfeatures as a paleo-sea-ice proxy. SIRD grains were largely subrounded, with medium relief, pervasive silica dissolution and a high abundance of breakage blocks and microlayering. The glacial grains were more angular, with lower relief and higher abundances of fractures and striations/gouges. Discriminate analysis shows a distinct difference between SIRD and glacial grains, with ˂7% of the SIRD grains containing typical glacial microtextures, suggesting this method is a useful means of inferring paleo-sea-ice presence in the marine record. We propose that differences in microfeatures of SIRD and glacial ice-rafted debris reflect differences in sediment transport and weathering histories. Sediment transported to a coastal setting and later rafted by sea ice would be subject to increased chemical weathering, whereas glaciers that calve icebergs would bypass the coastal marine environment, thus preserving their glacial signature.

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