Paleoceanographic history of the Guaymas Basin, Gulf of California, during the past 15,000 years based on diatoms, silicoflagellates, and biogenic sediments

noaa-ocean-5915 Barron et al. 2005 High Resolution Guaymas Basin Diatom and Silicoflagellate Data Barron, J.A.; Bukry, D.; Dean, W.E. Barron et al. 2005 High Resolution Guaymas Basin Diatom and Silicoflagellate Data 2005-08-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5915 Investigator J.A. Barron Investigator D. Bukry Investigator W.E. Dean earth science paleoclimate paleocean population abundance geoscientificInformation 14840 cal yr BP 2200 cal yr BP Complete 27.47 27.47 -112.1 -112.1 -820 -820 Ocean Pacific Ocean North Pacific Ocean GGC55>LATITUDE 27.47>LONGITUDE -112.1 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 John A. Barron, David Bukry, Walter E. Dean 2005 Paleoceanographic history of the Guaymas Basin, Gulf of California, during the past 15,000 years based on diatoms, silicoflagellates, and biogenic sediments Marine Micropaleontology 56 3-4 81-102 10.1016/j.marmicro.2005.04.001 http://www.sciencedirect.com/science/article/pii/S0377839805000356 Lloyd D. Keigwin 2002 Late Pleistocene-Holocene Paleoceanography and Ventilation of the Gulf of California Journal of Oceanography 58 2 421-432 10.1023/A:1015830313175 http://link.springer.com/article/10.1023/A%3A1015830313175 Walter E. Dean 2006 The geochemical record of the last 17,000 years in the Guaymas Basin, Gulf of California Chemical Geology 232 3-4 87-98 10.1016/j.chemgeo.2006.02.017 http://www.sciencedirect.com/science/article/pii/S000925410600129X

Sediments deposited on the western slope of the Guaymas Basin in the central Gulf of California are composed predominantly of detrital clastic material and biogenic silica (biopal), with minor organic material (average of 2.8% organic carbon) and calcium carbonate. The CaCO3 is derived from calcareous plankton and is highly variable ranging from 0% to 16%. In general, the CaCO3 content of the sediments varies inversely with the biopal content, reflecting the relative abundance of calcareous and siliceous plankton in the photic zone. Siliceous plankton dominate when winds are predominantly out of the northwest producing strong upwelling. Calcareous plankton indicates weak southeasterly winds that bring warm, tropical Pacific surface water into the Gulf. Based mainly on relative abundances of biopal and CaCO3, the sediments deposited over the last 17,000 years in the western Guaymas Basin can be divided into five intervals. In general, the sediments in the intervals with high biopal and low CaCO3 are laminated, but this is not always true. Unlike most other continental margins of the world with well-developed oxygen minimum zones where highest concentrations of organic carbon and redox-sensitive trace metals occur in laminated sediments, the laminated sediments on the anoxic slope of the western Guaymas Basin do not always have the highest concentrations of organic carbon and trace metals such as Mo and Cd. STUDY NOTES: Guaymas Basin High-resolution Diatom and Silicoflagellate Data. Samples are from piston core JC56 and nearby gravity core GGC-55 (27 28.22'N, 112 6.33'W; 820 m water depth) The chronology for GGC55 and JPC56 is after Keigwin (2002), who recalibrated the results of Pride et al. (1999) using the revised reservoir correction of 725 years (BR =395 years) for the central Gulf.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/barron2005/barron2005.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11