North Pacific deglacial hypoxic events linked to abrupt ocean warming Public Deposited

http://ir.library.oregonstate.edu/concern/articles/j96022490

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Nature Publishing Group and can be found at:  http://www.nature.com/nature/index.html

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Marine sediments from the North Pacific document two episodes of expansion and strengthening of the subsurface oxygen minimum zone (OMZ) accompanied by seafloor hypoxia during the last deglacial transition. The mechanisms driving this hypoxia remain under debate. We present a new high-resolution alkenone palaeotemperature reconstruction from the Gulf of Alaska that reveals two abrupt warming events of 4–5 degrees Celsius at the onset of the Bølling and Holocene intervals that coincide with sudden shifts to hypoxia at intermediate depths. The presence of diatomaceous laminations and hypoxia-tolerant benthic foraminiferal species, peaks in redox-sensitive trace metals, and enhanced ¹⁵N/¹⁴N ratio of organic matter, collectively suggest association with high export production. A decrease in ¹⁸O/¹⁶O values of benthic foraminifera accompanying the most severe deoxygenation event indicates subsurface warming of up to about 2 degrees Celsius. We infer that abrupt warming triggered expansion of the North Pacific OMZ through reduced oxygen solubility and increased marine productivity via physiological effects; following initiation of hypoxia, remobilization of iron from hypoxic sediments could have provided a positive feedback on ocean deoxygenation through increased nutrient utilization and carbon export. Such a biogeochemical amplification process implies high sensitivity of OMZ expansion to warming.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Praetorius, S. K., Mix, A. C., Walczak, M. H., Wolhowe, M. D., Addison, J. A., & Prahl, F. G. (2015). North Pacific deglacial hypoxic events linked to abrupt ocean warming. Nature, 527(7578), 362-366+. doi:10.1038/nature15753
Series
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-02-29T15:15:17Z (GMT) No. of bitstreams: 1 PraetoriusS.CEOASNorthPacificDeglacial.pdf: 5533869 bytes, checksum: db18378cf64f76a89791c9a6423fbe8e (MD5)
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-02-29T15:14:49Z No. of bitstreams: 1 PraetoriusS.CEOASNorthPacificDeglacial.pdf: 5533869 bytes, checksum: db18378cf64f76a89791c9a6423fbe8e (MD5)
  • description.provenance : Made available in DSpace on 2016-02-29T15:15:17Z (GMT). No. of bitstreams: 1 PraetoriusS.CEOASNorthPacificDeglacial.pdf: 5533869 bytes, checksum: db18378cf64f76a89791c9a6423fbe8e (MD5) Previous issue date: 2015-11-19

Relationships

In Administrative Set:
Last modified: 07/26/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items