Pollen analyses off Senegal: Evolution of the coastal palaeoenvironment during the last deglaciation
Pollen analyses off Senegal: Evolution of the coastal palaeoenvironment during the last deglaciation
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塞内加尔附近的花粉分析：末次冰消期沿海古环境的演变
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
G. Buchet
中科院分区：
文献类型：
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作者：
A. Lézine;J. Turon;G. Buchet
利用A180-48岩心（15°19′n, 18°06′w，水深2450 m，长530 cm）海洋沉积物中的花粉和鞭毛藻囊重建了末次消冰期热带西非近岸地区的古环境条件。在11000年至10000年BP之间花粉和鞭毛囊的高浓度和流入被解释为反映了北纬15°的大陆信风环流和相关的沿海上升流的增加。冰期和间冰期的海面温差并不像以前认为的那么大。加上当地（新鲜）地下水的输入，这种较小的温差可能解释了海岸附近的根藻红树林和几内亚走廊森林的持久性，直到它们在9500年前的全新世早期湿润最大值期间大规模扩展。将岩心的花粉数据与同一纬度大陆架的Rosilda N110-Z数据进行了比较。
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.