Redox trace metals and productivity in the Santa Barbara Basin for the past 200 years Wang, Y.; Hendy, I.L.; Napier, T.J. Wang, Y. Hendy, I.L. Napier, T.J. earth science/paleoclimate/paleocean (SPR0901-04BC Santa Barbara Basin>LATITUDE 34.281583>LONGITUDE -120.041483) Understanding dissolved oxygen variability in the ocean is limited by the short duration of direct measurements; however, sedimentary oxidation-reduction reactions can provide context for modern observations. Here we use bulk sediment redox-sensitive metal enrichment factors (MoEF, ReEF, and UEF) and scanning X-ray fluorescence records to examine annual-scale sedimentary oxygen concentrations in the Santa Barbara Basin from the Industrial Revolution (Common Era ~1850) to present. Enrichments are linked to measured bottom water oxygen concentrations after 1986. We reveal gradual intensification of the coastal oxygen minimum zone (OMZ) on the southern California margin coinciding with the twentieth century anthropogenic warming trend that leads to reduced oxygen solubility and greater stratification. High-frequency interannual oscillations become more prominent over the last three decades. These are attributed to local “flushing events” triggered by the transition from El Niño to La Niña conditions, which further amplify changes in the extratropical southern Californian OMZ. STUDY NOTES: Trace element concentrations and total organic carbon Provided Keywords: Redox, productivity, Santa Barbara Basin, oxygen minimum zone NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Wang, Y. Investigator : Hendy, I.L. Investigator : Napier, T.J. 2019-02-07 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/26050 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wang2017/wang2017-spr0901-04bc.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wang2017/wang2017-spr0901-04bc.txt English https://www.ncdc.noaa.gov/paleo/study/26050 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/wang2017/wang2017-spr0901-04bc.txt Wang, Yi, Ingrid Hendy, and Tiffany Napier2017Climate and Anthropogenic Controls of Coastal Deoxygenation on Interannual to Centennial TimescalesGeophysical Research Letters442211528–1153610.1002/2017gl075443 START YEAR: 1759 AD * END YEAR: 2007 AD -120.041483 34.281583 -120.041483 34.281583