noaa-ocean-19441 Central Equatorial Pacific Dust Flux, Productivity and d15N Data for 0-27ka Costa, K.; McManus, J.F.; Anderson, R.F.; Ren, H.; Sigman, D.M.; Winckler, G.; Fleisher, M.Q.; Marcantonio, F.; Ravelo, A.C. Central Equatorial Pacific Dust Flux, Productivity and d15N Data for 0-27ka 2015-10-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19441 Investigator K. Costa Investigator J.F. McManus Investigator R.F. Anderson Investigator H. Ren Investigator D.M. Sigman Investigator G. Winckler Investigator M.Q. Fleisher Investigator F. Marcantonio Investigator A.C. Ravelo earth science paleoclimate paleoceanography age,null,one standard error,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium,sediment,two standard deviations,parts per million,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography biogenic silica,sediment,null,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Opal mass accumulation rate earth science paleoclimate paleoceanography delta 15N,Trilobatus sacculifer,null,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography delta 15N,Globorotalia tumida,null,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography barium excess,sediment,null,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass accumulation rate earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,C,null earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography accumulation rate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography dust,sediment,two standard deviations,milligram per square centimeter per year,null,paleoceanography,null,null,N,dust flux earth science paleoclimate paleoceanography 231Pa/230Th excess,sediment,null,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 15N,Globigerinoides ruber,two standard deviations,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography delta 15N,Globorotalia tumida,two standard deviations,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography biogenic silica,sediment,two standard deviations,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Opal mass accumulation rate earth science paleoclimate paleoceanography 231Pa/230Th excess,sediment,two standard deviations,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography accumulation rate,sediment,two standard deviations,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium excess,sediment,two standard deviations,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass accumulation rate earth science paleoclimate paleoceanography delta 15N,Globigerinoides ruber,null,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography biogenic silica,sediment,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography dust,sediment,null,milligram per square centimeter per year,null,paleoceanography,null,null,N,dust flux earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,C,Time Slice name earth science paleoclimate paleoceanography latitude,null,null,degree north,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium,sediment,null,parts per million,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium excess,sediment,null,parts per million,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium excess,sediment,two standard deviations,parts per million,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 15N,Trilobatus sacculifer,two standard deviations,per mil,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean lithology earth science paleoclimate paleocean nitrogen isotopes geoscientificInformation Last Glacial Maximum 27000 cal yr BP 2000 cal yr BP Complete -.22 6.83 -161 -156 -2850 -2850 Ocean Pacific Ocean Central Pacific Ocean Line Islands>LATITUDE 3.3>LONGITUDE -158.5 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 Costa, K.M.; McManus, J.F.; Anderson, R.F.; Ren, H.; Sigman, D.M.; Winckler, G.; Fleisher, M.Q.; Marcantonio, F. and Ravelo, A.C. 2015 Nature 529 519-522 10.1038/nature16453

The “major” nutrients for phytoplankton growth (nitrogen, phosphorus, and silicon) are supplied to the surface waters of the Equatorial Pacific (EP) by wind-driven upwelling along the equator. Their consumption by phytoplankton is thought to be limited in part by the low concentrations of the critical micro-nutrient iron. Greater atmospheric dust deposition may have fertilized the EP with iron during the Last Glacial Period (LGP, 17-27,000 years ago). Here we present meridional transects of dust (232Th), phytoplankton productivity (opal, 231Pa/230Th, excess Ba), and the degree of nitrate consumption (foraminifera-bound d15N) from the Central EP for Holocene and LGP time slices. Despite two- to three-fold greater dust deposition in the Central EP, productivity was the same or lower during the LGP compared to the Holocene, and the degree of nitrate consumption was unchanged. These biogeochemical findings suggest that the relatively greater ice age dust fluxes were inadequate to drive significant iron fertilization in the Central EP, which may be because the absolute rate of dust deposition in the LGP, despite being greater than the Holocene rate, was still very low. The lower productivity coupled with unchanged nitrate consumption suggests lower subsurface major nutrient concentrations in the Central EP during the LGP. As these nutrients are today dominantly sourced from the Subantarctic Zone of the Southern Ocean, the Central EP data are consistent with more complete nutrient consumption in the Subantarctic, apparently because of iron fertilization in that region, where absolute dust fluxes were much higher. Thus, ice age iron fertilization ultimately worked to lower, not raise, Equatorial Pacific productivity. STUDY NOTES: Site Information: MC # BB # Lat(N) Long(W) Depth(m) 14 13 -0.22 156 3049 21 20 1.27 157.3 2850 26 25 2.46 159.4 3545 29 28 2.97 159.2 3152 33 32 5.2 160.4 2933 39 36 6.83 161 2859 Provided Keywords: Holocene, Last Glacial Period, dust, productivity, Th isotopes, opal, barium

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2015/costa2015-opal.txt Formatted Text File; Line Islands Opal Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2015/costa2015-d15n.txt Formatted Text File; Line Islands d15N Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2015/costa2015-barium.txt Formatted Text File; Line Islands Barium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/costa2015/costa2015-th-pa.txt Formatted Text File; Line Islands Pa/Th Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11