Premium
Pollen analyses off Senegal: Evolution of the coastal palaeoenvironment during the last deglaciation
Author(s) -
Lezine AnneMarie,
Turon JeanLouis,
Buchet Guillaume
Publication year - 1995
Publication title -
journal of quaternary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.142
H-Index - 94
eISSN - 1099-1417
pISSN - 0267-8179
DOI - 10.1002/jqs.3390100202
Subject(s) - deglaciation , pollen , oceanography , geology , interglacial , mangrove , palynology , holocene , continental shelf , dinoflagellate , upwelling , last glacial maximum , sea level , latitude , physical geography , glacial period , paleontology , geography , ecology , biology , geodesy
Pollen and dinoflagellate cysts from marine sediments in core A180‐48 (15°19′N, 18°06′W; 2450 m water depth; 530 cm length) are used to reconstruct palaeoenvironmental conditions of nearshore tropical west Africa during the last deglaciation. High concentrations and influxes of pollen and dinoflagellate cysts between 11 000 and 10 000 yr BP are interpreted as reflecting an increase in continental trade‐wind circulation and related coastal upwelling at 15°N latitude. The sea‐surface temperature difference between glacial and interglacial times was not as strong as previously suggested. Together with local (fresh) ground‐water input, this smaller temperature difference may explain the persistence of the Rhizophora mangrove and Guinean gallery forests near the shore until their massive extension during the early Holocene humid maximum around 9500 yr BP. Pollen data from the core are compared with data from Rosilda N110‐Z, from the continental shelf at the same latitude.