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Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change Eric A. Meyerson (CCI, U. Maine) Paul A. Mayewski (CCI, U. Maine) Sharon B. Sneed.

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Presentation on theme: "Bipolar Synchroneity and Latitudinal Timing of Holocene Climate Change Eric A. Meyerson (CCI, U. Maine) Paul A. Mayewski (CCI, U. Maine) Sharon B. Sneed."— Presentation transcript:

1 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) This project funded by the National Science Foundation’s Office of Polar Programs (Grant Number 0096305) Amundsen Sea Siple Dome. Image: USGS

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 (CCRC UNH) IC Lab & Freezer Lab Workers John Rhoades (NICL) Gordon Hamilton (UMaine) Brenda Hall (UMaine) Yan Yuping (UMaine) Amundsen Sea Siple Dome. Image: USGS This project funded by the National Science Foundation’s Office of Polar Programs (Grant Number 0096305) Acknowledgements

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

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

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

6

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

8 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) SEP OCT NOV

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

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

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

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

13 GISP2 Holocene Figure from: O’Brien et al., Science, 1995. Polar Circulation Index (PCI) (Denton & Karlén, 1973)

14 ssNa nssK nssCa Holocene GISP2 Siple Dome Taylor Dome DC

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

16 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

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

18 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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