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Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change

Climate. Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change. Eric A. Meyerson (CCI, U. Maine) Paul A. Mayewski (CCI, U. Maine) Sharon B. Sneed (CCI, U. Maine) Andrei V. Kurbatov (CCI, U. Maine) Karl J. Kreutz (CCI, U. Maine) Greg A. Zielinski (CCI, U. Maine)

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Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change

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  1. Climate Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change • Eric A. Meyerson (CCI, U. Maine) • Paul A. Mayewski (CCI, U. Maine) • Sharon B. Sneed (CCI, U. Maine) • Andrei V. Kurbatov (CCI, U. Maine) • Karl J. Kreutz (CCI, U. Maine) • Greg A. Zielinski (CCI, U. Maine) • Kendrick C. Taylor (DRI) • Ed J. Brook (Wash. State U.) • Eric J. Steig (U Washington) Siple Dome . Amundsen Sea Image: USGS This project funded by the National Science Foundation’s Office of Polar Programs (Grant Number 0096305)

  2. Gregg Lamorey, SDM SCO (DRI) Geoff Hargreaves and NICL Polar Ice Coring Office Field and CPL Team-Members Clim. Change Res. Ctr. (UNH) Sallie Whitlow (CCRCUNH) IC Lab & Freezer Lab Workers John Rhoades (NICL) Gordon Hamilton (UMaine) Brenda Hall (UMaine) Yan Yuping (UMaine) Climate Acknowledgements Siple Dome . Amundsen Sea Image: USGS This project funded by the National Science Foundation’s Office of Polar Programs (Grant Number 0096305)

  3. Prepared by D. Dixon (UMaine) using RAMP-DEM (Liu et al., 2000).

  4. Siple Dome, West Antarctica Elevation: 621 m a.s.l. 81.654°S, 148.808°W waiscores.dri.edu Hamilton, Annals of Glaciology, 35, 2002

  5. Siple Dome A-Core Hamilton (2002), modified from Nereson et al. (1996)

  6. A 1400-year high-resolution record of Atmospheric circulation over the North Atlantic and Asia Meeker & Mayewski, Holocene (2002) Icelandic Low (DJF) Siberian Low (MAM) ssNa nssK

  7. Sea-level pressure variability in the Amundsen Sea region inferred from a West Antarctic glaciochemical record Kreutz, Mayewski, Pittalwala, Meeker, Twickler, Whitlow J. Geophys. Res. (2000) OCT SEP NOV

  8. nssK, nssCa (cont. dusts) ssNa (sea-salts)

  9. GISP2: Mayewski et al., 1997 TD: Mayewski et al., 1996 DC: Röthlisberger et al., 2002

  10. GISP2: Mayewski et al., 1997 TD: Mayewski et al., 1996 DC: Röthlisberger et al., 2002

  11. 20000 to 0 years BP NASA/GSFC Scientific Visualization Studio Scientist: B. Bindschadler Animator: A. Kekesi

  12. 2 1 0 -1 world wide glacial expansions and their relative magnitude synthesis of Southern Hemisphere climate proxy North America records, showing cold periods Europe and Greenland Cockburn Moraine advance YD event -GISP2 0 2000 4000 6000 8000 10,000 12,000 Years Before Present 0 2000 4000 6000 8000 10,000 14 Å C Years Before Present GISP2 Holocene Polar Circulation Index (PCI) (Denton & Karlén, 1973) Figure from: O’Brien et al., Science, 1995.

  13. Holocene ssNa GISP2 Siple Dome nssK DC Taylor Dome nssCa

  14. Late-Holocene (≤ 2000 yr B2k) ssNa GISP2 Siple Dome nssK DC Taylor Dome nssCa

  15. Conclusions: Glacial-to-Holocene -SDM displays mid- to high-latitude S. Pacific signal (ssNa) as well as Polar Plateau climate signal (nssCa) -SDM ssNa shows rise from Early-Holocene most likely from dominating role of ASL due to WAIS grounding line retreat in Ross Sea Embayment (Conway et al., 1999; Baroni & Hall, in review) -ssNa reaches highest levels in most recent ~500 years, even higher than LGM concentrations in contrast to GISP, TD, DC

  16. Conclusions: Holocene -Bipolar Synchronicity of Rapid Climate Change Events at: ~6000-5000 yr BP ~3000 yr BP ~modern millenial (classic “LIA” time period)

  17. Conclusions: Late-Holocene -Bi-Core Confirmation of Late-Holocene Event at Siple Dome --A-Core (this study) --1994-Core (Kreutz et al., Science, 1997) -Bipolar Synchronicity of this modern millenial event -Bipolar Onset Timing Differs (due to site location wrt hemispheric continents) Evolution of Event -SD ssNa Senses Atm. Circ. 1st (~750 yr B.P.) -GISP2 Dusts & Sea-Salts (600 yr B.P.) -SD Dusts as Atm. Circ. Expands North (400 yr B.P.) -

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