noaa-ocean-11934 Subtropical NW Atlantic ODP1058 Mid-Pleistocene G. ruber d18O Data Weirauch, D.; Billups, K.; Martin, P.A. Subtropical NW Atlantic ODP1058 Mid-Pleistocene G. ruber d18O Data 2011-09-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/11934 Investigator D. Weirauch Investigator K. Billups Investigator P.A. Martin earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,composited,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,Globigerinoides ruber white,null,per mil,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean oxygen isotopes geoscientificInformation 1350400 cal yr BP 411000 cal yr BP Complete 31.69 31.69 -75.43 -75.43 -2996 -2996 Ocean Atlantic Ocean North Atlantic Ocean ODP 1058>LATITUDE 31.69>LONGITUDE -75.43 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 Weirauch, D., K. Billups, and P. Martin. 2008. Evolution of millennial-scale climate variability during the mid-Pleistocene. Paleoceanography, 23, PA3216, doi:10.1029/2007PA001584.

We use the oxygen isotopic composition of planktonic foraminifera Globigerinoides ruber (white) from Ocean Drilling Program Site 1058 in the subtropical northwestern Atlantic to construct a high- resolution (~800 year) climate record spanning the mid-Pleistocene climate transition (~410 ka to 1350 ka). We investigate whether or not millennial-scale instabilities in the proxy record are associated with the extent of continental glaciation. G. ruber d18O values display high-frequency fluctuations throughout the record, but the amplitude about mean glacial and interglacial d18O values increases at marine isotope stage (MIS) 22 (880 ka) and is highest during MIS 12. These observations support that millennial-scale climate instabilities are associated with ice sheet size. Time series analysis illustrates that these variations have significant concentration of spectral power centered on periods of ~10-12 ka and ~5 ka. The timing of these fluctuations agrees well, or coincides with, the periodicities of the second and fourth harmonics, respectively, of precessional forcing at the equator. An insolation-based origin of the millennial-scale instabilities would be independent of ice volume and explains the presence of these fluctuations before the mid-Pleistocene climate transition as well as during interglacial intervals (e.g., MIS 37 and 17). Because the amplitude of the millennial-scale variations increases during the mid-Pleistocene transition, feedback mechanisms associated with the growth of large, 100-ka-paced, polar ice sheets may be important amplifiers of regional surface water hydrographic changes. STUDY NOTES: The data set summarizes Globigerinoides ruber d18O data from Site 1058 spanning Marine Isotope Stages 12-42 (410-1350 Ka). Note that G. ruber between 56.30 and 85.13 mcd were published by Billups et al. 2006.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weirauch2008/weirauch2008.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weirauch2008/weirauch2008.txt USA/NOAA DIF Version 9.8.4 2019-05-06 2019-05-06