AMS radiocarbon dates on ten monospecific samples of planktonic foraminifer Globigerinoides ruber of sediment core GeoB8509-2 (Table 1)

Aeolian and fluvial sediment transport to the Atlantic Ocean offshore Mauritania were reconstructed based on grain-size distributions of the carbonate-free silt fraction of three marine sediment records of Cap Timiris Canyon to monitor the climatic evolution of present-day arid north-western Africa. During the late Pleistocene, predominantly coarse-grained particles, which are interpreted as windborne dust, characterise glacial dry climate conditions with a low sea level and extended sand seas that reach onto the exposed continental shelf off Mauritania. Subsequent particle fining and the abrupt decrease in terrigenous supply are attributed to humid climate conditions and dune stabilisation on the adjacent African continent with the onset of the Holocene humid period. Indications for an ancient drainage system, which was discharging fluvial mud offshore via Cap Timiris Canyon, are provided by the finest end member for early to mid Holocene times. […]

基于卡蒂里里斯峡谷（Cap Timiris Canyon）三份海洋沉积记录中碳酸无泥沙粒度分布，对毛里塔尼亚近海的风成和河流沉积向大西洋的运输进行了重建，以监控现今干旱的西北非地区的气候演变。在晚更新世时期，以粗颗粒物质为主，被解释为风尘，标志着冰川干冷气候条件，海平面较低，并延伸至毛里塔尼亚大陆架的广阔沙海。随后的颗粒细化以及陆源物质供应的急剧减少，归因于湿润气候条件和非洲大陆上沙丘的稳定化，伴随着全新世湿润期的开始。对于古代排水系统，该系统通过卡蒂里里斯峡谷向近海排放河流淤泥，早期至中期全新世时期的细粒端元提供了证据。