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Silicon dynamics in the Oder estuary, Baltic Sea

Pastuszak, Marianna; Conley, Daniel LU ; Humborg, Chnistoph; Witek, Zbigniew and Sitek, Stanislaw (2008) In Journal of Marine Systems 73(3-4). p.250-262
Abstract
Studies on dissolved silicate (DSi) and biogenic silica (BSi) dynamics were carried out in the Oder estuary, Baltic Sea in 2000-2005. The Oder estuary proved to be an important component of the Oder River-Baltic Sea continuum where very intensive seasonal DSi uptake during spring and autumn, but also BSi regeneration during summer take place. Owing to the regeneration process annual DSi patterns in the river and the estuary distinctly differed; the annual patterns of DSi in the estuary showed two maxima and two minima in contrast to one maximum- and one minimum-pattern in the Oder River. F)Si concentrations in the river and in the estuary were highest in winter (200-250 mu mol dm(-3)) and lowest (often less than 1 mu mol dm(-3)) in spring,... (More)
Studies on dissolved silicate (DSi) and biogenic silica (BSi) dynamics were carried out in the Oder estuary, Baltic Sea in 2000-2005. The Oder estuary proved to be an important component of the Oder River-Baltic Sea continuum where very intensive seasonal DSi uptake during spring and autumn, but also BSi regeneration during summer take place. Owing to the regeneration process annual DSi patterns in the river and the estuary distinctly differed; the annual patterns of DSi in the estuary showed two maxima and two minima in contrast to one maximum- and one minimum-pattern in the Oder River. F)Si concentrations in the river and in the estuary were highest in winter (200-250 mu mol dm(-3)) and lowest (often less than 1 mu mol dm(-3)) in spring, concomitant with diatom growth; such low values are known to be limiting for new diatom growth. Secondary DSi summer peaks at the estuary exit exceeded 100 mu mol dm(-3), and these maxima were followed by autumn minima coinciding with the autumn diatom bloom. Seasonal peaks in BSi concentrations (ca. 100 mu mol dm(-3)) occurred during the spring diatom bloom in die Oder River. Mass balance calculations of DSi and BSi showed that DSi + BSi import to the estuary over a two year period was 103.2 kt and that can be compared with the DSi export of 98.5 kt. The difference between these numbers gives room for ca. 2.5 kt BSi to be annually exported to the Baltic Sea. Sediment cores studies point to BSi annual accumulation on the level of 2.5 kt BSi. BSi import to the estuary is on the level of ca. 10.5 kt, thus ca. 5 kt of BSi is annually converted into the DSi, increasing the pool of DSi that leaves the system. BSi concentrations being ca. 2 times higher at the estuary entrance than at its exit remain in a good agreement with the DSi and BSi budgeting presented in the paper. (C) 2008 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Baltic, Oder estuary, DSi budget, DSi, BSi dynamics
in
Journal of Marine Systems
volume
73
issue
3-4
pages
250 - 262
publisher
Elsevier
external identifiers
  • wos:000260563300004
  • scopus:51249093054
ISSN
0924-7963
DOI
10.1016/j.jmarsys.2007.10.013
language
English
LU publication?
yes
id
1e8b4111-cf75-4777-9e4b-1d1b4aba0e1c (old id 1283105)
date added to LUP
2009-02-10 12:01:59
date last changed
2017-10-01 04:30:18
@article{1e8b4111-cf75-4777-9e4b-1d1b4aba0e1c,
  abstract     = {Studies on dissolved silicate (DSi) and biogenic silica (BSi) dynamics were carried out in the Oder estuary, Baltic Sea in 2000-2005. The Oder estuary proved to be an important component of the Oder River-Baltic Sea continuum where very intensive seasonal DSi uptake during spring and autumn, but also BSi regeneration during summer take place. Owing to the regeneration process annual DSi patterns in the river and the estuary distinctly differed; the annual patterns of DSi in the estuary showed two maxima and two minima in contrast to one maximum- and one minimum-pattern in the Oder River. F)Si concentrations in the river and in the estuary were highest in winter (200-250 mu mol dm(-3)) and lowest (often less than 1 mu mol dm(-3)) in spring, concomitant with diatom growth; such low values are known to be limiting for new diatom growth. Secondary DSi summer peaks at the estuary exit exceeded 100 mu mol dm(-3), and these maxima were followed by autumn minima coinciding with the autumn diatom bloom. Seasonal peaks in BSi concentrations (ca. 100 mu mol dm(-3)) occurred during the spring diatom bloom in die Oder River. Mass balance calculations of DSi and BSi showed that DSi + BSi import to the estuary over a two year period was 103.2 kt and that can be compared with the DSi export of 98.5 kt. The difference between these numbers gives room for ca. 2.5 kt BSi to be annually exported to the Baltic Sea. Sediment cores studies point to BSi annual accumulation on the level of 2.5 kt BSi. BSi import to the estuary is on the level of ca. 10.5 kt, thus ca. 5 kt of BSi is annually converted into the DSi, increasing the pool of DSi that leaves the system. BSi concentrations being ca. 2 times higher at the estuary entrance than at its exit remain in a good agreement with the DSi and BSi budgeting presented in the paper. (C) 2008 Elsevier B.V. All rights reserved.},
  author       = {Pastuszak, Marianna and Conley, Daniel and Humborg, Chnistoph and Witek, Zbigniew and Sitek, Stanislaw},
  issn         = {0924-7963},
  keyword      = {Baltic,Oder estuary,DSi budget,DSi,BSi dynamics},
  language     = {eng},
  number       = {3-4},
  pages        = {250--262},
  publisher    = {Elsevier},
  series       = {Journal of Marine Systems},
  title        = {Silicon dynamics in the Oder estuary, Baltic Sea},
  url          = {http://dx.doi.org/10.1016/j.jmarsys.2007.10.013},
  volume       = {73},
  year         = {2008},
}