 |
| Titel |
A multi-archive coherent chronology: from Greenland to the Mediterranean sea |
| VerfasserIn |
Lucie Bazin, Amaëlle Landais, Bénédicte Lemieux-Dudon, Giuseppe Siani, Elisabeth Michel, Nathalie Combourieu-Nebout, Dominique Blamart, Dominique Genty |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111709
|
| Publikation (Nr.) |
 EGU/EGU2015-11850.pdf |
|
|
|
|
|
| Zusammenfassung |
| Understanding the climate mechanisms requires a precise knowledge of the sequence of
events during major climate changes. In order to provide precise relationships between
changes in orbital and/or greenhouse gases concentration forcing, sea level changes and high
vs low latitudes temperatures, a common chronological framework for different paleoclimatic
archives is required.
Coherent chronologies for ice cores have been recently produced using a bayesian dating
tool, DATICE (Lemieux-Dudon et al., 2010, Bazin et al., 2013, Veres et al., 2013). Such tool
has been recently developed to include marine cores and speleothems in addition to ice cores.
This new development should enable one to test the coherency of different chronologies using
absolute and stratigraphic links as well as to provide relationship between climatic changes
recorded in different archives. We present here a first application of multi-archive
coherent dating including paleoclimatic archives from (1) Greenland (NGRIP ice core),
(2) Mediterranean sea (marine core MD90-917, 41Ë N17Ë E, 1010 m) and (3)
speleothems from the South of France and North Tunisia (Chauvet, Villars and La Mine
speleothems, Genty et al., 2006). Thanks to the good absolute chronological constraints
from annual layer counting in NGRIP, 14C and tephra layers in MD90-917 and
U-Th dating in speleothems, we can provide a precise chronological framework
for the last 50 ka (ie. thousand years before present). Then, we present different
tests on how to combine the records from the different archives and give the most
plausible scenario for the sequence of events at different latitudes over the last
deglaciation.
Bazin, L., Landais, A. ; Lemieu¬-Dudon, B. ; Kele, H. T. M. ; Veres, D. ; Parrenin, F. ;
Martinerie, P. ; Ritz, C. ; Capron, E. ; Lipenkov, V. ; Loutre, M.-F. ; Raynaud, D. ; Vinther, B.
; Svensson, A. ; Rasmussen, S. ; Severi, M. ; Blunier, T. ; Leuenberger, M. ; Fischer, H. ;
Masson-¬-Delmotte, V. ; Chappellaz, J. & Wolff, E., An optimized multi-proxy, multi-site
Antarctic ice and gas orbital chronology (AICC2012): 120-800 ka,Clim. Past 9, 1715-1731,
2013.
Genty, D., Blamart, D., Ghaleb B., Plagnes, V., Causse, Ch., Bakalowicz, M., Zouari, K.,
Chkir, N., Hellstrom, J., Wainer, K., Bourges, F., Timing and dynamics of the last
deglaciation from European and North African δ13C stalagmite profiles – comparison
with Chinese ans South Hemisphere stalagmites, Quat. Sci. Rev. 25, 2118-2142,
2006.
Lemieux-Dudon, B. ; Blayo, E. ; Petit, J.-R. ; Waelbroeck, C. ;Svensson, A. ; Ritz, C. ;
Barnola, J.-M. ; Narcisi, B.M. ; Parrenin, F., Consitent dating for Antarctic and Greenland ice
cores, Quat. Sci. Rev. 29(1-2), 2010.
Veres, D. ; Bazin, L. ; Landais, A. ; Lemieux-Dudon, B. ; Parrenin, F. ; Martinerie, P. ;
Toyé Mahamadou Kele, H. ; Capron, E. ; Chappellaz, J. ; Rasmussen, S. ; Severi, M. ;
Svensson, A. ; Vinther, B. & Wolff, E., The Antarctic ice core chronology (AICC2012): an
optimized multi-parameter and multi-site dating approach for the last 120 thousand years,
Clim. Past, 9, 1733-1748, 2013. |
|
|
|
|
|
|