noaa-ocean-26711 North Atlantic Globorotalia truncatulinoides Data During the Mid-Pleistocene Kaiser, E.A.; Caldwell, A.; Billups, K. North Atlantic Globorotalia truncatulinoides Data During the Mid-Pleistocene 2019-05-03 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/26711 Investigator E.A. Kaiser Investigator A. Caldwell Investigator K. Billups earth science paleoclimate paleocean population abundance geoscientificInformation 1220000 cal yr BP 411000 cal yr BP Complete 4.204133 56.042667 -75.43 -23.231333 -3427 -2301 Ocean Atlantic Ocean North Atlantic Ocean DSDP 607>LATITUDE 41.000019>LONGITUDE -32.950122 Ocean Atlantic Ocean North Atlantic Ocean ODP 1058>LATITUDE 31.69>LONGITUDE -75.43 Ocean Atlantic Ocean North Atlantic Ocean DSDP 552A>LATITUDE 56.042667>LONGITUDE -23.231333 Ocean Atlantic Ocean North Atlantic Ocean ODP 925B>LATITUDE 4.204133>LONGITUDE -43.48915 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 Kaiser, E.A., Caldwell, A., and Billups, K. 2019 Paleoceanography and Paleoclimatology 10.1029/2018PA003502

We use the coiling direction of planktic foraminifer Globorotalia truncatulinoides from four sites in the North Atlantic Ocean to assess spatial changes in upper-ocean hydrography during the mid-Pleistocene climate transition. Core top sediments indicate that the left-coiling (sinistral) variety dominates regions characterized by a deep permanent thermocline as is characteristic of the subtropical gyre (Ocean Drilling Program Sites 1058 and Deep Sea Drilling Project Site 607) while right-coiling (dextral) tests dominate the tropical (Ocean Drilling Program Site 925) and subpolar site (Deep Sea Drilling Project Site 552). We observe pronounced changes in the dominant coiling direction at the three subtropical to subpolar sites during the first of the more extreme glacial to interglacial transitions of the mid-Pleistocene climate transition, Marine Isotope Stages (MISs) 22 to 21. We interpret these observations to reflect an increase in poleward warm water advection. The time interval between MIS 21 and MIS 15 is marked by a pronounced absence of sinistral tests. Because G. truncatulinoides (sinistral) is a deep dwelling species, their absence may be related to a decrease in dissolved oxygen during warm interglacial intervals. At the tropical site, precessional-scale variations dominate changes in the coiling direction until midpoint interglacial MIS 23. Occurrences in the sinistral variety at this locale must be linked to cross-equatorial water transport in the North Brazil Current, and precessional-scale variations provide evidence for the sensitivity of the tropical regions to precessional forcing, at least until MIS 23 when this morphotype disappears in agreement with observation at other sites in the Atlantic Ocean. STUDY NOTES: Provided Keywords: mid-Pleistocene transition, Globorotalia truncatulinoides, subtropical gyre, subpolar North Atlantic, cross-equatorial heat transport, precession

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kaiser2019/kaiser2019-dsdp607.txt NOAA Template File; DSDP 607 G. truncatulinoides Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kaiser2019/kaiser2019-odp925.txt NOAA Template File; ODP 925B G. truncatulinoides Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kaiser2019/kaiser2019-dsdp552.txt NOAA Template File; DSDP 522A G. truncatulinoides Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kaiser2019/kaiser2019-odp1058.txt NOAA Template File; ODP 1058 G. truncatulinoides Data USA/NOAA DIF Version 9.8.4 2019-05-07 2019-05-07