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Glacio-isostatic control on hypoxia in a high-latitude shelf basin

Jilbert, Tom; Conley, Daniel LU ; Gustafsson, Bo G.; Funkey, Carolina LU and Slomp, Caroline P. (2015) In Geology 43(5). p.427-430
Abstract
In high-latitude continental shelf environments, late Pleistocene glacial overdeepening and early Holocene eustatic sea-level rise combined to create restricted marine basins with a high vulnerability to oxygen depletion. Here we show that ongoing glacio-isostatic rebound during the Holocene may have played an important role in determining the distribution of past hypoxia in these environments by controlling the physical exchange of water masses and the distribution of large-scale phosphorus (P) sinks. We focus on the Baltic Sea, where sediment records from a large, presently oxic sub-basin show evidence for intense hypoxia and cyanobacteria blooms during the Holocene Thermal Maximum. Using paleobathymetric modeling, we show that this... (More)
In high-latitude continental shelf environments, late Pleistocene glacial overdeepening and early Holocene eustatic sea-level rise combined to create restricted marine basins with a high vulnerability to oxygen depletion. Here we show that ongoing glacio-isostatic rebound during the Holocene may have played an important role in determining the distribution of past hypoxia in these environments by controlling the physical exchange of water masses and the distribution of large-scale phosphorus (P) sinks. We focus on the Baltic Sea, where sediment records from a large, presently oxic sub-basin show evidence for intense hypoxia and cyanobacteria blooms during the Holocene Thermal Maximum. Using paleobathymetric modeling, we show that this period was characterized by enhanced deep-water exchange, allowing widespread phosphorus regeneration. Intra-basin sills then shoaled over a period of several thousand years, enhancing P burial in one of the sub-basins. Together with climate forcing, this may have caused the termination of hypoxia throughout the Baltic Sea. Similar rearrangements of physical and chemical processes likely occurred in response to glacio-isostatic rebound in other high-latitude shelf basins during the Holocene. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Geology
volume
43
issue
5
pages
427 - 430
publisher
Geological Society of America
external identifiers
  • wos:000357619400015
  • scopus:84929466270
ISSN
0091-7613
DOI
10.1130/G36454.1
language
English
LU publication?
yes
id
d292bbef-a60a-45c9-b6ca-a64b26b57d9e (old id 7790920)
date added to LUP
2015-09-03 09:05:08
date last changed
2017-04-09 04:10:17
@article{d292bbef-a60a-45c9-b6ca-a64b26b57d9e,
  abstract     = {In high-latitude continental shelf environments, late Pleistocene glacial overdeepening and early Holocene eustatic sea-level rise combined to create restricted marine basins with a high vulnerability to oxygen depletion. Here we show that ongoing glacio-isostatic rebound during the Holocene may have played an important role in determining the distribution of past hypoxia in these environments by controlling the physical exchange of water masses and the distribution of large-scale phosphorus (P) sinks. We focus on the Baltic Sea, where sediment records from a large, presently oxic sub-basin show evidence for intense hypoxia and cyanobacteria blooms during the Holocene Thermal Maximum. Using paleobathymetric modeling, we show that this period was characterized by enhanced deep-water exchange, allowing widespread phosphorus regeneration. Intra-basin sills then shoaled over a period of several thousand years, enhancing P burial in one of the sub-basins. Together with climate forcing, this may have caused the termination of hypoxia throughout the Baltic Sea. Similar rearrangements of physical and chemical processes likely occurred in response to glacio-isostatic rebound in other high-latitude shelf basins during the Holocene.},
  author       = {Jilbert, Tom and Conley, Daniel and Gustafsson, Bo G. and Funkey, Carolina and Slomp, Caroline P.},
  issn         = {0091-7613},
  language     = {eng},
  number       = {5},
  pages        = {427--430},
  publisher    = {Geological Society of America},
  series       = {Geology},
  title        = {Glacio-isostatic control on hypoxia in a high-latitude shelf basin},
  url          = {http://dx.doi.org/10.1130/G36454.1},
  volume       = {43},
  year         = {2015},
}