论文部分内容阅读
对南海北部89PC柱状样进行了浮游有孔虫定量统计分析、氧碳同位素测试、碳酸钙含量分析和AMS14C测年,并采用古生态转换函数计算了表层海水古温度和温跃层深度,揭示了该海区约127 ka以来的古海洋学特征。温跃层转换函数计算的温跃层深度结果表明,在MIS5-MIS4期,温跃层深度没有大的变化,在MIS3-MIS1期,温跃层的深度逐渐变深。古温度转换函数计算的古温度结果表明,夏季温度的变化范围为27.9~29.3℃,变化幅度为1.4℃,冬季温度变化范围为20.6~26.3℃,变化幅度为5.7℃。与南海南部的冬夏古水温资料进行对比,南海南部的温度比南海北部的温度要高,这种差异在冬季时表现更为突出,且在冰期时南海南部和北部的温度差异梯度进一步增大,指示了冰期时冬季风更加强盛。
Quantitative and statistical analysis of planktonic foraminifera 8989 columnar samples in the northern South China Sea, oxygen and carbon isotope test, calcium carbonate content analysis and AMS14C dating, paleoclimate transfer function was used to calculate the Paleoclimate paleoclimate and thermocline depth, revealing Paleoceanographic characteristics of the sea area since about 127 ka. The thermocline depth calculated by the thermocline transfer function shows that there is no significant change in the thermocline depth in MIS5-MIS4, and the depth of the thermocline becomes deeper in MIS3-MIS1. Paleotemperatures calculated from ancient temperature conversion function show that the variation range of summer temperature is 27.9 ~ 29.3 ℃, and the range of variation is 1.4 ℃. The variation range of winter temperature is 20.6 ~ 26.3 ℃ and the variation range is 5.7 ℃. Compared with the data of winter and summer paleosols in the southern South China Sea, the temperature in the southern South China Sea is higher than the temperature in the northern South China Sea. The differences are more prominent in winter and the gradient of temperature difference in southern and northern South China Sea further increases during the glacial period, The winter monsoon was even stronger when the ice age was indicated.