Variations of the NW African Trade Wind Regime during the Last 140 000 Years: Changes in Pollen Flux Evidenced by Marine Sediment Records
Variations of the NW African Trade Wind Regime during the Last 140 000 Years: Changes in Pollen Flux Evidenced by Marine Sediment Records
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过去 14 万年非洲西北部信风制度的变化：海洋沉积物记录证明的花粉通量变化
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
H. Hooghiemstra
中科院分区：
文献类型：
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作者：
H. Hooghiemstra
对位于37° ~ 9°N之间的7个东大西洋柱状样的花粉进行了分析。岩芯沿着东北信风主轨迹上的一条样带。样带的北方与花粉源区较近，而南方与花粉源区较远（<2000 km）。风在将花粉从信风带的最北端运送到取芯地点的过程中起主导作用。因此，柱样中的花粉是一种潜在的风沙流监测物。基于18 O和14 C的沉积物剖面的时间控制使得有可能将花粉数据显示为流入记录。在估计了不同花粉源区的纬度变化后，花粉通量的时空变化被用来评估信风活力的变化。
Pollen was analyzed in 7 eastern Atlantic cores located between 37° and 9°N. The cores lie along a transect in the main trajectory of the northeast trade winds. The northern sector of the transect is close to source areas of pollen; whereas, the southern sector is distant (<2000 km) from the pollen source areas. Winds dominate in the transport of pollen from the northernmost part of the trade wind belt to the coring sites. Therefore, the pollen in the cores is a potential monitor of eolian transport. 18O and 14C based time control of the sediment sections made it possible to display the pollen data as influx records. After having estimated latitudinal shifts of the different pollen source areas, spatial and temporal variations in the pollen flux have been used to evaluate changes in the trade wind vigor.