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Gebhardt, Holger; Sarnthein, Michael; Grootes, Pieter Meiert; Kiefer, Thorsten; Kühn, Hartmut; Schmieder, Frank; Röhl, Ursula (2008): Paleonutrient and productivity records from the subarctic North Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.701578, Supplement to: Gebhardt, H et al. (2008): Paleonutrient and productivity records from the subarctic North Pacific for Pleistocene glacial terminations I to V. Paleoceanography, 23(4), PA4212, https://doi.org/10.1029/2007PA001513

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Abstract:
Our study addresses fundamental questions of the mode and timing of orbital and millennialscale changes in the meridional overturning circulation (MOC) of the subarctic North Pacific. Particular concerns are the vertical mixing, the present and past abundance of nutrients in surface waters despite strong stratification, and the North Pacific - North Atlantic seesaw of oscillations in sea surface temperature (SST). We do this by generating and interpreting multiple records for glacial terminations I-V down two long piston cores, one each from the western and eastern subarctic Pacific. Chlorins and biogenic opal are proxies for surface water productivity; delta 13C of epibenthic foraminifera is a record of deepwater ventilation; and the delta 13C of N. pachyderma sin. is a tracer of nutrients in subsurface waters that extend up to the sea surface during times of vertical mixing. The degree of mixing is traced by pairing SST and delta 18O records of planktic surface and subsurface (pycnocline) dwellers. Tight age control is deduced from a suite of age-calibrated 14C plateau boundaries for Termination I, and benthic ä18O, and geomagnetic events for the last 800 kyr. 14C paleoreservoir ages record the ages of surface and deep waters to uncover short-term changes in MOC over Termination I. We have defined a standard sequence of short-term productivity events for Termination I and subsequent interglacials, also evident during Terminations II to V over the last 450 ka. The peak-glacial regime of stable stratification and low productivity terminated, together with the end of ice rafting and melting, near 17 ka, ~2000 yr after the onset of Termination I. Pulses of vertical mixing and incursion of warm surface waters from the subtropics followed. Convected young water masses finally penetrated down to 2350 m water depth after a further 1500 yr, at ~14.5 ka, significantly improving bottom water ventilation through the late deglacial and earliest interglacial. Mixing with upwelled nutrients from the pycnocline induced shortterm maxima in algal production of chlorins and biogenic opal near 17-15 and 15-12 ka, respectively. Deglacial meltwater incursions in the Aleutian Current and silica input from North American rivers also promoted East Pacific productivity after 15.5 ka. Productivity decreased during the late deglacial and early interglacial, coeval with an exceptional peak in CaCO3 preservation caused by both low organic flux and well ventilated deepwater. Subsequently, low-salinity and cool surface waters and in turn, stratification were gradually restored. A second, opal-dominated productivity maximum marked the ends of interglacials. The deglacial pulses of vertical mixing around 17-11 ka imply an important contribution of the North Pacific to the coeval release of oceanic CO2 into the atmosphere and support the east-west seesaw model of climate change.
Project(s):
International Marine Global Change Study (IMAGES)
Coverage:
Median Latitude: 52.829350 * Median Longitude: -170.598150 * South-bound Latitude: 51.268000 * West-bound Longitude: 167.725000 * North-bound Latitude: 54.390700 * East-bound Longitude: -148.921300
Date/Time Start: 2001-06-09T20:05:00 * Date/Time End: 2002-05-23T00:00:00
Event(s):
MD01-2416 (MD012416) * Latitude: 51.268000 * Longitude: 167.725000 * Date/Time: 2001-06-09T20:05:00 * Elevation: -2317.0 m * Recovery: 44.75 m * Location: Emperor Seamounts * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne * Device: Giant piston corer (GPC) * Comment: Pilot core (trigger core) available: see MD01-2416PC
MD02-2489 (MD022489) * Latitude: 54.390700 * Longitude: -148.921300 * Date/Time: 2002-05-23T00:00:00 * Elevation: -3640.0 m * Recovery: 29.8 m * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne * Device: Giant piston corer (GPC) * Comment: Originally the site and core belonged to the cruise IMAGES VII WEPAMA but was postponed due to tight schedule. The core was then taken in 2002, during transit, preliminary to cruise IMAGES VIII MONA.
Size:
28 datasets

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Datasets listed in this publication series

  1. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Calcium intensity of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626590
  2. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Calcium intensity of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626606
  3. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Carbon and oxygen stable isotopes on C. wuellerstorfi of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708659
  4. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Carbon and oxygen stable isotopes on G.bulloides of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708662
  5. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Carbonate of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626594
  6. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Chlorine concentration of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626595
  7. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Chlorine concentration of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626607
  8. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Dry bulk density of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626600
  9. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Dry bulk density of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626610
  10. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Ice rafted debris of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626601
  11. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Ice rafted debris of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626611
  12. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Opal of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626604
  13. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Opal of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626612
  14. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Radiocarbon ages of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708672
  15. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Sea surface temperature (SIMMAX) on planktic foraminifera of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626613
  16. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Sea surface temperature (SST, annual mean) on Mg/Ca ratio of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626602
  17. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Sea surface temperature (annual mean) on G.bulloides of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708665
  18. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Sea surface temperature (annual mean) on N.pachyderma of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708667
  19. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Sea surface temperature using SIMMAX transfer function on planktic foraminifera of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626603
  20. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable carbon isotopes on Cibicidoides spp of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626596
  21. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable carbon isotopes on Neogloboquadrina pachyderma sinistral of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626597
  22. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable carbon isotopes on Neogloboquadrina pachyderma sinistral of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626608
  23. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2013): Stable isotope ratios on G. bulloides of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.808514
  24. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable oxygen isotopes on Neogloboquadrina pachyderma sinistral of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626598
  25. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable oxygen isotopes on Neogloboquadrina pachyderma sinistral of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.626609
  26. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Stable oxygen isotopes on Uvigerina spp. of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626599
  27. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Total organic carbon (TOC) of sediment core MD01-2416. https://doi.org/10.1594/PANGAEA.626605
  28. Gebhardt, H; Sarnthein, M; Grootes, PM et al. (2008): Total, inorganic and organic carbon content of sediment core MD02-2489. https://doi.org/10.1594/PANGAEA.708664