摘要
通过对南海4个岩心的74个样品进行Q型因子分析,求得4个浮游有孔虫组合:亚热带-热带组合,温凉组合,热带易溶组合和亚热带组合。亚热带-热带组合为优势组合,它的发育状况反映了晚第四纪西太平洋热带海水对南海的影响程度,其因子载荷作为古海流特征的参数。温凉组合的发育与南海存在冷涡有关。利用转换函数FP-12E计算了南海南部表层古水温,冰期与间冰期的表层水温平均变化冬季为4.7℃和2.9℃,夏季为3.0℃和2.1℃,季节性温差冰期最大可达8.6℃,间冰期最大可达5.0℃,均比太平洋同一纬度海区的大。冬季表层古水温波动比夏季的大。全新世的表层水温呈上升趋势,但在NS86-43柱中有一变冷现象,这可能和the younger Younger Dryas有关。
Q-mode factor analysis of total planktonic foramin feral faunas from 4 sediment cores in South China Sea defines subtropical-tropical assemblage, temperate cool assemblage, dissolution suspecible assemblage and subtropical assemblage. The subtropical-tropical assemblage is the dominant assemblage, which reflects the effect of tropical water from West Pacific to the South China Sea in late Quaternary. The temperate cool assemblage might be associated with the cycloon cold eddy current in the northern South China Sea.Transfer function FP-12E was used to make the paleo-sea surface temperature(SST) in two cores of southern South China Sea. The result reveals 4.7℃and 2.9℃, 3.0℃ and 2.1℃ change of winter and summer paleo-SST between glacial and interglacial stage, respectively.The change of winter paleo-SST was greater than that of summer paleo-SST. In the glacial stage, however,the seasonal contrast(Ts桾w) (8.6℃) exceeded that in the interglacial stage (5.0℃), which was greater than that in the same latitudinal zone in the Pacific. In Holocene,the SST increased, but there is a cooling phenomenon in core NS86-43, which might be associated with the younger Younger Dryas.
出处
《热带海洋》
CSCD
1992年第2期62-69,共8页
关键词
浮游有孔虫
因子分析
古海流
planktonic foraminiferal assemblages, factor analysis, paleo-current,paleo-SST fluctuation
