Palaeoceanographic evolution of the central Red Sea during the late Holocene
Palaeoceanographic evolution of the central Red Sea during the late Holocene
复制标题
全新世晚期红海中部的古海洋演化
DOI：
10.1177/0959683608098955
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
C. Hemleben
中科院分区：
文献类型：
--
作者：
Y. Edelman‐Furstenberg;A. Almogi‐Labin;C. Hemleben
在苏丹港外的红海中部的三个多岩心进行了研究，以重建过去的6000年的古海洋学条件在W-E样带。表层浮游有孔虫Globigerinoides ruber与深层有孔虫G. sacculifer的存在/不存在模式的中远洋翼足类Limacinabulimoides一起，反映了混合层和中间水柱属性的变化，并使过去的6000年分为五个区。这些古海洋学变化反映了晚全新世气候波动。两个不同的气候系统调节着红海中部的水文地理：北部的地中海气候系统控制着较深沃茨的形成，在干燥和严酷的冬季，随着G.反映北方红海中活跃的深水形成的囊状体。第二个是季风气候系统，在季风加强时，它调节来自南方的营养物质输入和热带辐合带（ITCZ）向北移动的位置。G.鲁伯表示季风气候系统的影响更大。最干旱的时期（4200-3400年BP）与高丰度的G。sacculifer和最大丰度的Limacina bulimoides，与地中海气候系统。这一时期是一个广泛的区域规模，也符合在印度洋季风系统的脉冲减弱。
Three multicores were studied in the Central Red Sea off Port Sudan at a W—E transect in order to reconstruct palaeoceanographic conditions of the past ~6000 years. Downcore fluctuations in the relative abundance of the epipelagic planktic foraminifera Globigerinoides ruber versus that of the deeper dweller G. sacculifer, together with the presence/absence pattern of the mesopelagic pteropod Limacina bulimoides, reflect variations in the mixed layer and intermediate water column properties and enabled a division of the past ~6000 years into five zones. These palaeoceanographic changes reflect late-Holocene climate fluctuations. Two distinct climate systems regulate the hydrography of the central Red Sea: the Mediterranean climate system to the north controls the formations of the deeper waters, at times of drier and harsher winters, with periods of increased abundance of G. sacculifer reflecting a vigorous deep-water formation in the northern Red Sea. The second is the monsoonal climate system that regulates the nutrient input from the south and the shifting northward position of the Intertropical Convergence Zone (ITCZ) at times of monsoon intensification. Increasing abundances in G. ruber indicate greater influence of the monsoonal climate system. The most arid interval (4200—3400 yr BP) is associated with high abundance of G. sacculifer and maximum abundance of Limacina bulimoides , linked to the Mediterranean climate system. This period is of a wide regional scale and also coincides with a pulse of weakening in the Indian Ocean monsoonal system.