TY - JOUR
T1 - Eurasian contribution to the last glacial dust cycle
T2 - How are loess sequences built?
AU - Rousseau, Denis Didier
AU - Svensson, Anders
AU - Bigler, Matthias
AU - Sima, Adriana
AU - Peder Steffensen, Jorgen
AU - Boers, Niklas
N1 - Funding Information:
Acknowledgements. Denis-Didier Rousseau and Anders Svens-son are partly supported by ANR Research grant (ACTES: ANR08-BLAN-0227 – CSD 6). Anders Svensson, Matthias Bigler and Jorgen Peder Steffensen are supported by NGRIP. NGRIP is directed and organized by the Ice and Climate research group, Niels Bohr Institute, University of Copenhagen. It is supported by funding agencies in Denmark (FNU), Belgium (FNRS-CFB), France (IPEV and INSU/CNRS), Germany (AWI), Iceland. (RannIs), Japan (MEXT), Sweden (SPRS), Switzerland (SNF) and the USA (NSF, Office of Polar Programs). Niklas Boers acknowledges funding by the Alexander von Humboldt Foundation and the German Federal Ministry for Education and Research. This work started thanks to the support of our dear colleague and friend Sigfus Johnsen to who it is dedicated. Eric Wolff and Jerry McManus are thanked for providing useful comments on drafts of that paper which strongly improved it. CNRS-INSU rejected a support request to DDR for the completion of this study because of the lack of innovation and interest, but hopefully thoughts remain free.
PY - 2017/9/19
Y1 - 2017/9/19
N2 - The last 130 000 years have been marked by pronounced millennial-scale climate variability, which strongly impacted the terrestrial environments of the Northern Hemisphere, especially at middle latitudes. Identifying the trigger of these variations, which are most likely associated with strong couplings between the ocean and the atmosphere, still remains a key question. Here, we show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations in the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments corresponding to present desert areas, but also hidden regions related to lower sea level stands, dry rivers, or zones close to the frontal moraines of the main Northern Hemisphere ice sheets. We anticipate our study to be at the origin of more sophisticated and elaborated investigations of millennial and sub-millennial continental climate variability in the Northern Hemisphere.
AB - The last 130 000 years have been marked by pronounced millennial-scale climate variability, which strongly impacted the terrestrial environments of the Northern Hemisphere, especially at middle latitudes. Identifying the trigger of these variations, which are most likely associated with strong couplings between the ocean and the atmosphere, still remains a key question. Here, we show that the analysis of δ18O and dust in the Greenland ice cores, and a critical study of their source variations, reconciles these records with those observed on the Eurasian continent. We demonstrate the link between European and Chinese loess sequences, dust records in Greenland, and variations in the North Atlantic sea ice extent. The sources of the emitted and transported dust material are variable and relate to different environments corresponding to present desert areas, but also hidden regions related to lower sea level stands, dry rivers, or zones close to the frontal moraines of the main Northern Hemisphere ice sheets. We anticipate our study to be at the origin of more sophisticated and elaborated investigations of millennial and sub-millennial continental climate variability in the Northern Hemisphere.
UR - http://www.scopus.com/inward/record.url?scp=85029619128&partnerID=8YFLogxK
U2 - 10.5194/cp-13-1181-2017
DO - 10.5194/cp-13-1181-2017
M3 - Article
AN - SCOPUS:85029619128
SN - 1814-9324
VL - 13
SP - 1181
EP - 1197
JO - Climate of the Past
JF - Climate of the Past
IS - 9
ER -