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Holocene Hydrographic Variations From the Baltic-North Sea Transitional Area (IODP Site M0059)

Ni, S. LU ; Quintana Krupinski, N. B. LU ; Groeneveld, J. LU ; Fanget, A. S. ; Böttcher, M. E. ; Liu, B. ; Lipka, M. ; Knudsen, K. L. ; Naeraa, T. LU and Seidenkrantz, M. S. , et al. (2020) In Paleoceanography and Paleoclimatology 35(2).
Abstract

Deoxygenation affects many continental shelf seas across the world today and results in increasing areas of hypoxia (dissolved oxygen concentration ([O2]) <1.4 ml/L). The Baltic Sea is increasingly affected by deoxygenation. Deoxygenation correlates with other environmental variables such as changing water temperature and salinity and is directly linked to ongoing global climate change. To place the ongoing environmental changes into a larger context and to further understand the complex Baltic Sea history and its impact on North Atlantic climate, we investigated a high accumulation-rate brackish-marine sediment core from the Little Belt (Site M0059), Danish Straits, NW Europe, retrieved during the Integrated Ocean... (More)

Deoxygenation affects many continental shelf seas across the world today and results in increasing areas of hypoxia (dissolved oxygen concentration ([O2]) <1.4 ml/L). The Baltic Sea is increasingly affected by deoxygenation. Deoxygenation correlates with other environmental variables such as changing water temperature and salinity and is directly linked to ongoing global climate change. To place the ongoing environmental changes into a larger context and to further understand the complex Baltic Sea history and its impact on North Atlantic climate, we investigated a high accumulation-rate brackish-marine sediment core from the Little Belt (Site M0059), Danish Straits, NW Europe, retrieved during the Integrated Ocean Drilling Program (IODP) Expedition 347. We combined benthic foraminiferal geochemistry, faunal assemblages, and pore water stable isotopes to reconstruct seawater conditions (e.g., oxygenation, temperature, and salinity) over the past 7.7 thousand years (ka). Bottom water salinity in the Little Belt reconstructed from modeled pore water oxygen isotope data increased between 7.7 and 7.5 ka BP as a consequence of the transition from freshwater to brackish-marine conditions. Salinity decreased gradually (from 30 to 24) from 4.1 to ~2.5 ka BP. By using the trace elemental composition (Mg/Ca, Mn/Ca, and Ba/Ca) and stable carbon and oxygen isotopes of foraminiferal species Elphidium selseyensis and E. clavatum, we identified that generally warming and hypoxia occurred between about 7.5 and 3.3 ka BP, approximately coinciding in time with the Holocene Thermal Maximum (HTM). These changes of bottom water conditions were coupled to the North Atlantic Oscillation (NAO) and relative sea level change.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
foraminifera, Holocene Thermal Maximum, LA-ICP-MS, NAO, Skagerrak, trace elements
in
Paleoceanography and Paleoclimatology
volume
35
issue
2
article number
e2019PA003722
publisher
Wiley-Blackwell
external identifiers
  • scopus:85081126653
ISSN
2572-4517
DOI
10.1029/2019PA003722
project
Tracing marine hypoxic conditions during warm periods using a microanalytical approach
Tracing hypoxia during warm periods in the Baltic Sea region - using synchrotron X-ray spectroscopy and plasma analytical methods
language
English
LU publication?
yes
id
ec10d5d8-7bc2-4c72-a59e-c74c40c80e93
date added to LUP
2020-05-25 08:36:22
date last changed
2024-03-04 18:59:10
@article{ec10d5d8-7bc2-4c72-a59e-c74c40c80e93,
  abstract     = {{<p>Deoxygenation affects many continental shelf seas across the world today and results in increasing areas of hypoxia (dissolved oxygen concentration ([O<sub>2</sub>]) &lt;1.4 ml/L). The Baltic Sea is increasingly affected by deoxygenation. Deoxygenation correlates with other environmental variables such as changing water temperature and salinity and is directly linked to ongoing global climate change. To place the ongoing environmental changes into a larger context and to further understand the complex Baltic Sea history and its impact on North Atlantic climate, we investigated a high accumulation-rate brackish-marine sediment core from the Little Belt (Site M0059), Danish Straits, NW Europe, retrieved during the Integrated Ocean Drilling Program (IODP) Expedition 347. We combined benthic foraminiferal geochemistry, faunal assemblages, and pore water stable isotopes to reconstruct seawater conditions (e.g., oxygenation, temperature, and salinity) over the past 7.7 thousand years (ka). Bottom water salinity in the Little Belt reconstructed from modeled pore water oxygen isotope data increased between 7.7 and 7.5 ka BP as a consequence of the transition from freshwater to brackish-marine conditions. Salinity decreased gradually (from 30 to 24) from 4.1 to ~2.5 ka BP. By using the trace elemental composition (Mg/Ca, Mn/Ca, and Ba/Ca) and stable carbon and oxygen isotopes of foraminiferal species Elphidium selseyensis and E. clavatum, we identified that generally warming and hypoxia occurred between about 7.5 and 3.3 ka BP, approximately coinciding in time with the Holocene Thermal Maximum (HTM). These changes of bottom water conditions were coupled to the North Atlantic Oscillation (NAO) and relative sea level change.</p>}},
  author       = {{Ni, S. and Quintana Krupinski, N. B. and Groeneveld, J. and Fanget, A. S. and Böttcher, M. E. and Liu, B. and Lipka, M. and Knudsen, K. L. and Naeraa, T. and Seidenkrantz, M. S. and Filipsson, H. L.}},
  issn         = {{2572-4517}},
  keywords     = {{foraminifera; Holocene Thermal Maximum; LA-ICP-MS; NAO; Skagerrak; trace elements}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{2}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Paleoceanography and Paleoclimatology}},
  title        = {{Holocene Hydrographic Variations From the Baltic-North Sea Transitional Area (IODP Site M0059)}},
  url          = {{http://dx.doi.org/10.1029/2019PA003722}},
  doi          = {{10.1029/2019PA003722}},
  volume       = {{35}},
  year         = {{2020}},
}