Multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr Public Deposited

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Copyright 2007 by the American Geophysical Union.

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  • Sea surface temperature (SST) and salinity of the Western Pacific Warm Pool (WPWP) reflect global climate effects such as the El Nin˜o–Southern Oscillation phenomenon. However, reconstructions of past changes in the WPWP from the geologic record vary depending on the specific proxy record used. Here we develop a multiproxy record of the last deglaciation from a radiocarbon-dated sediment core (MD97-2138) retrieved in the heart of the WPWP. SST reconstructions for the past 30,000 years based on planktonic foraminiferal Mg/Ca (Globigerinoides ruber and Globigerinoides sacculifer), alkenone unsaturation index, and foraminiferal transfer functions differ notably. Mg/Ca-based SST estimates from the surface dwelling species G. ruber in MD97-2138 indicate a larger surface cooling (3° ± 0.6°C) during the Last Glacial Maximum (LGM) than inferred from Mg/Ca ratios in G. sacculifer (2.3° ± 0.7°C), statistical transfer functions based on planktonic foraminiferal species assemblages, and Uk₃₇ 0 (1°–2°C). These estimates are consistent with estimates from other WPWP cores, thereby suggesting that the discrepancy is due to proxy compatibility rather than differences in cores qualitity. Postdepositional dissolution above the lysocline might have altered the Mg/Ca-based temperature estimates in our site, but this effect is insufficient to resolve discrepancies between Mg/Ca in G. ruber and the other proxies. We suggest that the lower estimates obtained from Mg/Ca in G. sacculifer, faunal transfer functions, and Uk₃₇ 0 might reflect subsurface temperature changes rather than strict surface estimates. Accounting for potential artefacts, including dissolution and bioturbation, we suggest that the glacial WPWP SST was about 2.5° ± 0.7°C cooler than during the Holocene, whereas the subsurface/upper thermocline temperature change was only about 1.8° ± 0.7°C. Interpreting variations in δ¹⁸OSW in terms of salinity changes suggests a possibly slight decrease in surface salinity at the site of MD97-2138 during the LGM. Though LGM freshening in MD97-2138 is not robust to postdeposition dissolution effects, this inferred freshening appears to be a general feature of the western equatorial Pacific.
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  • de Garidel-Thoron, T., Y. Rosenthal, L. Beaufort, E. Bard, C. Sonzogni, and A. C. Mix (2007), A multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr, Paleoceanography, 22, PA3204, doi:10.1029/2006PA001269
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  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2010-04-19T23:18:17Z (GMT) No. of bitstreams: 1 Garidel_Thoron et al Paleo 2007.pdf: 1337165 bytes, checksum: 8f1029fdd58ba967b68e2dad9cb65fff (MD5)
  • Vol. 22 (2007)
  • Paleoceanography
  • description.provenance : Submitted by Xiaoping Li (xiaoping.li@oregonstate.edu) on 2010-04-19T22:49:53Z No. of bitstreams: 1 Garidel_Thoron et al Paleo 2007.pdf: 1337165 bytes, checksum: 8f1029fdd58ba967b68e2dad9cb65fff (MD5)
  • description.provenance : Made available in DSpace on 2010-04-19T23:18:17Z (GMT). No. of bitstreams: 1 Garidel_Thoron et al Paleo 2007.pdf: 1337165 bytes, checksum: 8f1029fdd58ba967b68e2dad9cb65fff (MD5) Previous issue date: 2007

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