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Glacio-isostatic control on hypoxia in a high-latitude shelf basin
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.
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Number of Authors: 5
2015 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 43, no 5, 427-430 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 43, no 5, 427-430 p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-119257DOI: 10.1130/G36454.1ISI: 000357619400015OAI: diva2:845894
Available from: 2015-08-13 Created: 2015-08-03 Last updated: 2015-08-13Bibliographically approved

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Gustafsson, Bo G.
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