FN Archimer Export Format
PT J
TI Abrupt shifts of the Sahara-Sahel boundary during Heinrich stadials
BT 
AF COLLINS, J. A.
   GOVIN, A.
   MULITZA, S.
   HESLOP, D.
   ZABEL, M.
   HARTMANN, J.
   ROEHL, U.
   WEFER, G.
AS 1:1,2;2:1,2;3:1,2;4:3;5:1,2;6:4;7:1,2;8:1,2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Univ Bremen, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany.
   Univ Bremen, Fac Geosci, D-28359 Bremen, Germany.
   Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia.
   Univ Hamburg, Inst Biogeochem & Marine Chem, D-20146 Hamburg, Germany.
C2 UNIV BREMEN, GERMANY
   UNIV BREMEN, GERMANY
   UNIV AUSTRALIAN NATL, AUSTRALIA
   UNIV HAMBURG, GERMANY
IN DOAJ
IF 3.482
TC 54
UR https://archimer.ifremer.fr/doc/00181/29240/27635.pdf
   https://archimer.ifremer.fr/doc/00181/29240/48211.pdf
   https://archimer.ifremer.fr/doc/00181/29240/48212.pdf
   https://archimer.ifremer.fr/doc/00181/29240/48213.pdf
LA English
DT Article
CR MD 123 / GEOSCIENCES 1
   MD 134 / PICABIA
   MD 167 / RETRO (IMAGES XVI)
BO Marion Dufresne
AB Relict dune fields that are found as far south as 14 N in the modern-day African Sahel are testament to equatorward expansions of the Sahara desert during the Late Pleistocene. However, the discontinuous nature of dune records means that abrupt millennial-timescale climate events are not always resolved. High-resolution marine core studies have identified Heinrich stadials as the dustiest periods of the last glacial in West Africa although the spatial evolution of dust export on millennial timescales has so far not been investigated. We use the major-element composition of four high-resolution marine sediment cores to reconstruct the spatial extent of Saharan-dust versus river-sediment input to the continental margin from West Africa over the last 60 ka. This allows us to map the position of the sediment composition corresponding to the Sahara Sahel boundary. Our records indicate that the Sahara Sahel boundary reached its most southerly position (13 N) during Heinrich stadials and hence suggest that these were the periods when the sand dunes formed at 14 N on the continent. Heinrich stadials are associated with cold North Atlantic sea surface temperatures which appear to have triggered abrupt increases of aridity and wind strength in the Sahel. Our study illustrates the influence of the Atlantic meridional overturning circulation on the position of the Sahara Sahel boundary and on global atmospheric dust loading.
PY 2013
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 9
IS 3
UT 000322859700012
BP 1181
EP 1191
DI 10.5194/cp-9-1181-2013
ID 29240
ER

EF