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. Guilderson, T.P. McCarthy, M.D. Dunbar, R.B. Englebrecht, A. Roark, E.B. 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 earth science/paleoclimate/corals and sclerosponges (Hawaiian Islands>LATITUDE 21>LONGITUDE -161) (Kingman Reef/Palmyra Island>LATITUDE 6.1>LONGITUDE -162.3) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Guilderson, T.P. Investigator : McCarthy, M.D. Investigator : Dunbar, R.B. Investigator : Englebrecht, A. Investigator : Roark, E.B. 2015-03-12 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/18215 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-haw.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-line.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-haw.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-line.txt English https://www.ncdc.noaa.gov/paleo/study/18215 https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-haw.txt https://www1.ncdc.noaa.gov/pub/data/paleo/coral/central_pacific/guilderson2013/guilderson2013-line.txt Guilderson, T.P., M.D. McCarthy, R.B. Dunbar, A. Englebrecht, and E.B. Roark2013Late Holocene Variations in Pacific Surface Circulation and Biogeochemistry Inferred From Proteinaceous Deep-Sea CoralsBiogeosciences106019-602810.5194/bg-10-6019-2013 START YEAR: 10335 cal yr BP * END YEAR: -57 cal yr BP -166.74 5.92 -156.15 23.95