noaa-ocean-5964 Dean et al. 2006 Baja California Margin Oxygen-Minimum Zone Sediment Geochemical Data Dean, W.E.; Zheng, Y.; Ortiz, J.D. ; van Geen, L. Dean et al. 2006 Baja California Margin Oxygen-Minimum Zone Sediment Geochemical Data 2007-06-06 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5964 Investigator W.E. Dean Investigator Y. Zheng Investigator J.D. Ortiz Investigator L. van Geen earth science paleoclimate paleocean geochemistry geoscientificInformation 52000 cal yr BP 0 cal yr BP Complete 23.4667 25.2012 -112.7168 -111.3298 -4782 -432 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC13>LATITUDE 23.4667>LONGITUDE -111.8 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC18>LATITUDE 23.9438>LONGITUDE -111.3298 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC48>LATITUDE 25.2002>LONGITUDE -112.7168 Ocean Pacific Ocean Eastern Pacific Ocean MV99-PC05>LATITUDE 23.4667>LONGITUDE -111.5987 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC41/PC14>LATITUDE 25.2>LONGITUDE -112.7 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC32>LATITUDE 23.6083>LONGITUDE -111.5583 Ocean Pacific Ocean Eastern Pacific Ocean MV99-PC08>LATITUDE 23.4668>LONGITUDE -111.5985 Ocean Pacific Ocean Eastern Pacific Ocean MV99-PC10>LATITUDE 23.609>LONGITUDE -111.5583 Ocean Pacific Ocean Eastern Pacific Ocean MV99-GC31>LATITUDE 23.4672>LONGITUDE -111.5985 Ocean Pacific Ocean Eastern Pacific Ocean MV99-PC14>LATITUDE 25.2012>LONGITUDE -112.7167 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Walter E. Dean, Yan Zheng, Joseph D. Ortiz, and Alexander van Geen 2006 Paleoceanography 21 4 10.1029/2005PA001239 http://onlinelibrary.wiley.com/doi/10.1029/2005PA001239/abstract

Concentrations of organic carbon (orgC), cadmium (Cd), and molybdenum (Mo) were measured in two sediment cores raised from depths of 430 and 700 m within the oxygen-minimum zone (OMZ) off southern Baja California at a temporal resolution of -0.5 kyr over the past 52 kyr. These records are supplemented with diffuse spectral reflectance (DSR) measurements obtained on board ship soon after collection at a resolution of ∼0.05 kyr. In the core from 700 m depth, a component extracted from the DSR data and the three geochemical proxies generally vary in concert with each other and over a wide range (4-22% orgC; 1-40 mg/kg Cd; 5-120 mg/kg Mo). Intervals of increased orgC, Cd, and Mo accumulation generally correspond to warm periods recorded in the oxygen-isotopic composition of Greenland ice, with the exception of the Bolling/Allerod which is only weakly expressed off Baja California. Concentrations of the biogenic proxies are higher in the core from 430 m depth, but erratic sediment accumulation before 15 ka precludes dating of the older intervals that are laminated and contain elevated orgC, Cd, and Mo concentrations. The new data provide further evidence of an intimate teleconnection between global climate and the intensity of the OMZ and/or productivity along the western margin of North America. On the basis of a comparison with Cd and Mo records collected elsewhere in the region, we conclude that productivity may actually have varied off southern Baja California by no more than a factor of 2 over the past 52 kyr.

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