World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Direct Linking of Greenland and Antarctic Ice Cores at the Toba Eruption (74 Kyr Bp) : Volume 8, Issue 6 (05/11/2012)

By Svensson, A.

Click here to view

Book Id: WPLBN0003982058
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Direct Linking of Greenland and Antarctic Ice Cores at the Toba Eruption (74 Kyr Bp) : Volume 8, Issue 6 (05/11/2012)  
Author: Svensson, A.
Volume: Vol. 8, Issue 6
Language: English
Subject: Science, Climate, Past
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Popp, T., Fischer, H., Blunier, T., Clausen, H. B., Kohno, M., Schwander, J.,...Severi, M. (2012). Direct Linking of Greenland and Antarctic Ice Cores at the Toba Eruption (74 Kyr Bp) : Volume 8, Issue 6 (05/11/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Denmark. The Toba eruption that occurred some 74 kyr ago in Sumatra, Indonesia, is among the largest volcanic events on Earth over the last 2 million years. Tephra from this eruption has been spread over vast areas in Asia where it constitutes a major time marker close to the Marine Isotope Stage 4/5 boundary. As yet, no tephra associated with Toba has been identified in Greenland or Antarctic ice cores. Based on new accurate dating of Toba tephra from Malaysia and on accurately dated European stalagmites the Toba event is known to occur between the onsets of Greenland Interstadials (GI) 19 and 20. Furthermore, the existing linking of Greenland and Antarctic ice cores by gas records and by the bipolar seesaw hypothesis suggests that the Antarctic counterpart is situated between Antarctic Isotope Maxima (AIM) 19 and 20.

In this work we suggest a direct synchronization of Greenland (NGRIP) and Antarctic (EDML) ice cores at the Toba eruption based on matching of a pattern of bipolar volcanic spikes. Annual layer counting between volcanic spikes in both cores allows for a unique match. We first demonstrate this bipolar matching technique at the already synchronized Laschamp geomagnetic excursion (41 kyr BP) before we apply it to the suggested Toba interval. The Toba synchronization pattern covers some 2000 yr in GI-20 and AIM 19/20 and includes nine acidity peaks that are recognized in both ice cores.

The suggested bipolar Toba synchronization has decadal precision. It thus allows a determination of the exact phasing of inter-hemispheric climate in a time interval of poorly constrained ice core records, and it allows for a discussion of the climatic impact of the Toba eruption in a global perspective. Furthermore, our bipolar match provides a way to place paleo-environmental records other than ice cores into a precise climatic context.


Summary
Direct linking of Greenland and Antarctic ice cores at the Toba eruption (74 kyr BP)

Excerpt
Abbott, P. M., Davies, S. M., Austin, W. E. N., Pearce, N. J. G., and Hibbert, F. D.: Identification of cryptotephra horizons in a North East Atlantic marine record spanning marine isotope stages 4 and 5a (similar to 60 000–82 000 a b2k), Quatern. Int., 246, 177–189, doi:10.1016/j.quaint.2011.07.033, 2011.; Ambrose, S. H.: Late Pleistocene human population bottlenecks, volcanic winter, and differentiation of modern humans, J. Hum. Evol., 34, 623–651, doi:10.1006/jhev.1998.0219, 1998.; Andersen, K. K., Svensson, A., Rasmussen, S. O., Steffensen, J. P., Johnsen, S. J., Bigler, M., Röthlisberger, R., Ruth, U., Siggaard-Andersen, M.-L., Dahl-Jensen, D., Vinther, B. M., and Clausen, H. B.: The Greenland ice core chronology 2005, 15–42 kyr, Part 1: constructing the time scale, Quaternary Sci. Rev., 25, 3246–3257, 2006.; Bay, R. C., Bramall, N. E., Price, P. B., Clow, G. D., Hawley, R. L., et al.: Globally synchronous ice core volcanic tracers and abrupt cooling during the last glacial period, J. Geophys. Res.-Atmos., 111, D11108, doi:10.1029/2005jd006306, 2006.; Bender, M., Sowers, T., Dickson, M.-L., Orchardo, J., Grootes, P., et al.: Climate correlations between Greenland and Antarctica during the last 100 000 years, Nature, 372, 663–666, 1994.; Bigler, M.: Hochauflösende Spurenstoffmessungen an polaren Eisbohrkernen: Glazio-chemische und klimatische Prozessstudien, Physics Institute, University of Bern, Switzerland, 2004.; Blockley, S. P. E., Lane, C. S., Hardiman, M., Rasmussen, S. O., Seierstad, I. K., et al.: Synchronisation of palaeoenvironmental records over the last 60 000 years, and an extended INTIMATE(1) event stratigraphy to 48 000 b2k, Quaternary Sci. Rev., 36, 2–10, doi:10.1016/j.quascirev.2011.09.017, 2012.; Blunier, T. and Brook, E. J.: Timing of millennial-scale climate change in Antarctica and Greenland during the last glacial period, Science, 291, 109–112, 2001.; Blunier, T., Chappellaz, J., Schwander, J., Dällenbach, A., Stauffer, B., et al.: Asynchrony of Antarctic and Greenland climate change during the last glacial period, Nature, 394, 739–743, 1998.; Blunier, T., Spahni, R., Barnola, J.-M., Chappellaz, J., Loulergue, L., and Schwander, J.: Synchronization of ice core records via atmospheric gases, Clim. Past, 3, 325–330, doi:10.5194/cp-3-325-2007, 2007.; Boch, R., Cheng, H., Sp{ö}tl, C., Edwards, R. L., Wang, X., and H{ä}uselmann, Ph.: NALPS: a precisely dated European climate record 120–60 kyr, Clim. Past, 7, 1247–1259, doi:10.5194/cp-7-1247-2011, 2011.; Broecker, W. S.: Paleocean circulation during the last deglaciation: a bipolar seesaw?, Paleoceanography, 13, 119–121, 1998.; Capron, E., Landais, A., Chappellaz, J., Schilt, A., Buiron, D., Dahl-Jensen, D., Johnsen, S. J., Jouzel, J., Lemieux-Dudon, B., Loulergue, L., Leuenberger, M., Masson-Delmotte, V., Meyer,&nbs


 

Click To View

Additional Books


  • Quasi-100 Ky Glacial-interglacial Cycles... (by )
  • Inferred Gas Hydrate and Permafrost Stab... (by )
  • On the State-dependency of the Equilibri... (by )
  • Predicting Pleistocene Climate from Vege... (by )
  • Simulation of the Indian Monsoon and Its... (by )
  • Rapid Shifts in South American Montane C... (by )
  • Precipitation Changes in the South Ameri... (by )
  • Identification of Climatic State with Li... (by )
  • Contribution of Oceanic and Vegetation F... (by )
  • Proposing a Mechanistic Understanding of... (by )
  • The Reconstruction of Paleo Wind Directi... (by )
  • Quantifying the Ocean's Role in Glacial ... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.