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Amorphous silica transport in the Ganges basin: Implications for Si delivery to the oceans

Frings, Patrick LU ; Clymans, Wim LU and Conley, Daniel LU (2014) Geochemistry of the Earth's Surface (GES) Meeting In Procedia Earth and Planetary Science 10. p.271-274
Abstract
Rivers transport similar to 6 x 10(12) mol yr(-1) of dissolved Si (DSi) from the continents to the oceans. They also carry amorphous silica (ASi), solid phases likely to dissolve in seawater. Unfortunately, the magnitude of this flux is poorly constrained at a global scale. We present 92 new ASi values from suspended particulate matter (SPM) from the Ganges basin. Bulk SPM is 1.2% ASi, and mean ASi concentrations are 65 mu M, of comparable magnitude to DSi concentrations. Our results also indicate a) ASi is not evenly distributed in the water column of large rivers, b) the ASi is not a wholly biogenic Si endmember and c) the ASi flux is, to a first order, a function of the SPM load. Our results suggest that the ASi particulate load is much... (More)
Rivers transport similar to 6 x 10(12) mol yr(-1) of dissolved Si (DSi) from the continents to the oceans. They also carry amorphous silica (ASi), solid phases likely to dissolve in seawater. Unfortunately, the magnitude of this flux is poorly constrained at a global scale. We present 92 new ASi values from suspended particulate matter (SPM) from the Ganges basin. Bulk SPM is 1.2% ASi, and mean ASi concentrations are 65 mu M, of comparable magnitude to DSi concentrations. Our results also indicate a) ASi is not evenly distributed in the water column of large rivers, b) the ASi is not a wholly biogenic Si endmember and c) the ASi flux is, to a first order, a function of the SPM load. Our results suggest that the ASi particulate load is much greater than previously believed, rivaling that of the DSi load with important implications for the global Si cycle and oceanic Si isotopic budget. (C) 2014 The Authors. Published by Elsevier BAT. This is an open access article under the CC BY-NC-ND license (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
global silicon cycle, river amorphous silica, silicon isotopes, river fluxes
in
Procedia Earth and Planetary Science
volume
10
pages
271 - 274
publisher
Elsevier
conference name
Geochemistry of the Earth's Surface (GES) Meeting
external identifiers
  • WOS:000345407200048
DOI
10.1016/j.proeps.2014.08.059
language
English
LU publication?
yes
id
aae1bf55-0c11-476d-abb4-8a965f2b266d (old id 4982683)
date added to LUP
2016-01-11 10:47:45
date last changed
2016-06-02 12:07:54
@misc{aae1bf55-0c11-476d-abb4-8a965f2b266d,
  abstract     = {Rivers transport similar to 6 x 10(12) mol yr(-1) of dissolved Si (DSi) from the continents to the oceans. They also carry amorphous silica (ASi), solid phases likely to dissolve in seawater. Unfortunately, the magnitude of this flux is poorly constrained at a global scale. We present 92 new ASi values from suspended particulate matter (SPM) from the Ganges basin. Bulk SPM is 1.2% ASi, and mean ASi concentrations are 65 mu M, of comparable magnitude to DSi concentrations. Our results also indicate a) ASi is not evenly distributed in the water column of large rivers, b) the ASi is not a wholly biogenic Si endmember and c) the ASi flux is, to a first order, a function of the SPM load. Our results suggest that the ASi particulate load is much greater than previously believed, rivaling that of the DSi load with important implications for the global Si cycle and oceanic Si isotopic budget. (C) 2014 The Authors. Published by Elsevier BAT. This is an open access article under the CC BY-NC-ND license},
  author       = {Frings, Patrick and Clymans, Wim and Conley, Daniel},
  keyword      = {global silicon cycle,river amorphous silica,silicon isotopes,river fluxes},
  language     = {eng},
  pages        = {271--274},
  publisher    = {ARRAY(0xadcb440)},
  series       = {Procedia Earth and Planetary Science},
  title        = {Amorphous silica transport in the Ganges basin: Implications for Si delivery to the oceans},
  url          = {http://dx.doi.org/10.1016/j.proeps.2014.08.059},
  volume       = {10},
  year         = {2014},
}