noaa-ocean-5842 Dean and Gardner 1998 California Current Inorganic Component Data Dean, W.E.; Gardner, J.V. Dean and Gardner 1998 California Current Inorganic Component Data 1997-05-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5842 Investigator W.E. Dean Investigator J.V. Gardner earth science paleoclimate paleocean geoscientificInformation 30000 cal yr BP 0 cal yr BP Complete 32.92 42.12 -125.75 -119.73 -2712 -570 Ocean Pacific Ocean North Pacific Ocean F2-92-P34>LATITUDE 35.03>LONGITUDE -121.23 Ocean Pacific Ocean North Pacific Ocean F2-92-P51>LATITUDE 35.82>LONGITUDE -121.65 Ocean Pacific Ocean North Pacific Ocean F2-92-P29>LATITUDE 32.92>LONGITUDE -119.73 Ocean Pacific Ocean North Pacific Ocean F2-92-P33>LATITUDE 34.8>LONGITUDE -121.13 Ocean Pacific Ocean North Pacific Ocean W8709A-13PC>LATITUDE 42.12>LONGITUDE -125.75 Ocean Pacific Ocean Eastern Pacific Ocean F2-92-P03>LATITUDE 35.62>LONGITUDE -121.6075 Ocean Pacific Ocean North Pacific Ocean F2-92-P18>LATITUDE 34.7>LONGITUDE -121.1 Ocean Pacific Ocean North Pacific Ocean L13-81-G138>LATITUDE 38.42>LONGITUDE -123.97 Ocean Pacific Ocean North Pacific Ocean V1-81-G15>LATITUDE 33.35>LONGITUDE -120.43 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 and James V. Gardner 1998 Geological Society of America Bulletin 110 7 888-899 10.1130/0016-7606(1998)110 http://gsabulletin.gsapubs.org/content/110/7/888.abstract

Organic matter in sediments from cores collected from the upper continental slope (200-2700 m) off California and southern Oregon shows marked differences in concentration and marine character between the last glacial interval (ca. 24-10 ka) and either Holocene time or last interstadial (oxygen isotope stage 3, ca. 60-24 ka). In general, sediments deposited during Holocene time and stage 3 contain higher amounts of marine organic matter than those deposited during the last glacial interval, and this contrast is greatest in cores collected off southern California. The most profound differences in stage 3 sediments are between predominantly bioturbated sediments and occasional interbeds of laminated sediments. The sediments are from cores collected within the present oxygen minimum zone on the upper continental slope from as far north as the Oregon-California border to as far south as Point Conception. These upper Pleistocene laminated sediments contain more abundant hydrogen-rich (type II) marine algal organic matter than even surface sediments that have large amounts of nonrefractory organic matter. The stable carbon-isotopic composition of the organic matter does not change with time between bioturbated and laminated sediments, indicating that the greater abundance of type II organic matter in the laminated sediments is not due to a change in source but rather represents a greater degree of production and preservation of marine organic matter. The presence of abundant, well-preserved organic matter supports the theory that the oxygen minimum zone in the northeastern Pacific Ocean was more intense, and possibly anoxic, during late Pleistocene time as a result of increased coastal upwelling that enhanced algal productivity.

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