Interdecadal changes in intensity of the oxygen minimum zone off Concepción, Chile (~ 36° S), over the last century Public Deposited

http://ir.library.oregonstate.edu/concern/articles/bz60d1404

For a previous discussion paper please see:  http://hdl.handle.net/1957/57743

This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Copernicus Publications on behalf of the European Geosciences Union. The published article can be found at:  http://www.biogeosciences.net/

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  • Interdecadal changes in intensity of the oxygen minimum zone off Concepción, Chile (approximately 36 degrees S), over the last century
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  • We reconstructed oxygenation changes in the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and Cd were observed between ca. 1935 and 1971 CE, implying a prolonged period with predominantly more reduced conditions in bottom waters and surface sediments. Significant positive correlations between redox-sensitive metals, algal sterols, biomarkers of micro-aerophilic and anaerobic microorganisms, and archaeal glycerol dialkyl glycerol tetraethers point to a tight coupling among bottom water O₂ depletion and increased primary and export production. The time interval with low O₂ of ca. 35 years seems to follow low-frequency interdecadal variation of the Pacific Decadal Oscillation, and it may have resulted in O₂ depletion over the entire continental shelf off Concepción. Taking this together with the concurrent increase in sedimentary molecular indicators of micro-aerophilic and anaerobic microbes, we can suggest that changes in oxygenation of the water column are reflected by changes in microbial community. This study can inform our understanding of ecological consequences to projected trends in ocean deoxygenation.
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  • Srain, B., Pantoja, S., Sepúlveda, J., Lange, C. B., Muñoz, P., Summons, R. E., McKay, J., & Salamanca, M. (2015). Interdecadal changes in intensity of the oxygen minimum zone off Concepción, Chile (~ 36° S), over the last century, Biogeosciences, 12(20), 6045-6058, doi:10.5194/bg-12-6045-2015
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  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-11-16T15:37:28Z No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) McKayJCEOASInterdecadalChangesIntensityFinalRevisedPaper.pdf: 1318614 bytes, checksum: e2da59053b12d6135e88595a8f24ab15 (MD5) McKayJCEOASInterdecadalChangesIntensitySupplement.pdf: 2000609 bytes, checksum: 8a1c9ea5b5f8f08421a6ecde18b5f883 (MD5)
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