noaa-coral-18215 Late Holocene North Pacific Subtropical Gyre deep-sea proteinaceous coral d13C and d15N Guilderson, T.P.; McCarthy, M.D.; Dunbar, R.B.; Englebrecht, A.; Roark, E.B. Late Holocene North Pacific Subtropical Gyre deep-sea proteinaceous coral d13C and d15N 2015-03-12 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/18215 Investigator T.P. Guilderson Investigator M.D. McCarthy Investigator R.B. Dunbar Investigator A. Englebrecht Investigator E.B. Roark earth science paleoclimate corals and sclerosponges age,null,null,radiocarbon year before present,null,corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Kulamanamana haumeaae,null,per mil NBS oxalic acid,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,background subtraction; corrected for sample-specific delta 13C; reported as conventional radiocarbon years per Stuiver and Polach (1977) earth science paleoclimate corals and sclerosponges Delta 14C,Kulamanamana haumeaae,one standard deviation,per mil NBS oxalic acid,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,background subtraction; corrected for sample-specific delta 13C; reported as conventional radiocarbon years per Stuiver and Polach (1977) earth science paleoclimate corals and sclerosponges sample identification,null,null,null,null,corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges carbon/nitrogen,Kulamanamana haumeaae,null,dimensionless,null,corals and sclerosponges,raw,elemental analysis,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Kulamanamana haumeaae,one standard deviation,fraction of modern activity,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,background subtraction; corrected for sample-specific delta 13C; reported as conventional radiocarbon years per Stuiver and Polach (1977) earth science paleoclimate corals and sclerosponges age,null,one standard deviation,radiocarbon year,null,corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges notes,null,null,null,null,corals and sclerosponges,null,null,N,null earth science paleoclimate corals and sclerosponges delta 13C,Kulamanamana haumeaae,null,per mil VPDB,null,corals and sclerosponges,raw,elemental analysis|isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges delta 15N,Kulamanamana haumeaae,null,per mil AIR,null,corals and sclerosponges,raw,elemental analysis|isotope ratio mass spectrometry,N,null earth science paleoclimate corals and sclerosponges Delta 14C,Kulamanamana haumeaae,null,fraction of modern activity,null,corals and sclerosponges,corrected,accelerator mass spectrometry,N,background subtraction; corrected for sample-specific delta 13C; reported as conventional radiocarbon years per Stuiver and Polach (1977) earth science paleoclimate corals and sclerosponges chemistry earth science paleoclimate corals and sclerosponges carbon isotopes geoscientificInformation 10335 cal yr BP -57 cal yr BP Complete 5.92 23.95 -166.74 -156.15 Ocean Pacific Ocean Central Pacific Ocean Hawaiian Islands Hawaiian Islands>LATITUDE 21>LONGITUDE -161 Ocean Pacific Ocean Central Pacific Ocean Kingman Reef/Palmyra Island>LATITUDE 6.1>LONGITUDE -162.3 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 Guilderson, T.P., M.D. McCarthy, R.B. Dunbar, A. Englebrecht, and E.B. Roark 2013 Biogeosciences 10 6019-6028 10.5194/bg-10-6019-2013

δ15N and δ13C data obtained from samples of proteinaceous deep-sea corals collected from the North Pacific Subtropical Gyre (Hawaiian Archipelago) and the central equatorial Pacific (Line Islands) document multidecadal to century-scale variability in the isotopic composition of surface-produced particulate organic matter exported to the deep sea. Comparison of the δ13C data, where Line Islands samples are 0.6‰ more positive than the Hawaiian samples, supports the contention that the North Pacific Subtropical Gyre is more efficient than the tropical upwelling system at trapping and/or recycling nutrients within the mixed layer. δ15N values from the Line Islands samples are also more positive than those from the central gyre, and within the Hawaiian samples there is a gradient with more positive δ15N values in samples from the main Hawaiian Islands versus the French Frigate Shoals in the Northwestern Hawaiian Islands. The gradient in the Hawaiian samples likely reflects the relative importance of algal acquisition of metabolic N via dissolved seawater nitrate uptake versus nitrogen fixation. The Hawaiian sample set also exhibits a strong decrease in δ15N values from the mid-Holocene to present. We hypothesize that this decrease is most likely the result of decreasing trade winds, and possibly a commensurate decrease in entrainment of more positive δ15N-NO3 subthermocline water masses.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-haw.txt Formatted Text File; Hawaiian Islands Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-line.txt Formatted Text File; Line Islands Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11