【摘要】 海洋温度的重建对准确评估近2 000年来的全球温度变率和未来全球变暖至关重要。本文以取自台湾东北部外海域的TWNCY-4岩芯为材料，通过浮游有孔虫Globigerinoides ruber壳体的Mg/Ca比值，重建了晚全新世区域表层海水温度（SST）的演化序列。同时，结合已有的厄尔尼诺-南方涛动（ENSO）活动记录分析了近2 700 aBP以来冲绳海槽西南端SST的演变历史及其与热带过程间的联系。结果显示晚全新世该区SST呈现了先缓慢下降（2 743～1 080 aBP）、再快速上升（1 080～557 aBP），而后再次缓慢下降（557 aBP至今）的演变模式。尽管SST的频谱分析结果显示了典型的百年周期，但其演变过程明显不同于北半球温度和周边海域SST记录中典型的百年尺度冷暖波动，而是与热带西太平洋晚全新世以来的SST记录相当。对比发现SST的变化与众多记录中晚全新世ENSO的活动过程较为一致，特别是1 330 aBP以来SST的异常与El Ni??o发生频率和强度的变化相当吻合。分析表明，ENSO通过调控黑潮的强弱驱动了全新世晚期冲绳海槽西南端SST演变过程，显示了低纬过程在热带西太平洋热量向中高纬输运中的关键作用。更多还原

【Abstract】 Reconstructions of ocean temperatures are essential for accurate assessment of global temperature variability over the past 2 000 years and future global warming. Using the TWNCY-4 core off northeastern Taiwan, we reconstructed the evolutionary sequence of regional surface seawater temperature(SST) during the late Holocene based on planktonic foraminiferal(Globigerinoides ruber) shell Mg/Ca ratios. In conjunction with the existing El Ni??o-Southern Oscillation(ENSO) records, we analyzed the evolutionary history of SST at the southwestern end of the Okinawa Trough over the past 2 700 years, and its connection with tropical processes. Results show that the SST evolution in this region has exhibited a pattern of slow decline(2 743～1 080 aBP), rapid rise(1 080～557 aBP), and then slow decline again(557 aBP to the present) during the late Holocene. Although the results of spectral analysis of SST show a typical centennial cycle, its evolutionary process is distinctly different from the typical centennial-scale warm and cold fluctuations in the Northern Hemisphere temperature and the surrounding oceanic SST records. The variation of SST is comparable to that of the SST records in the tropical western Pacific during the late Holocene.Comparison reveals that SST variations are consistent with the ENSO activity documented in numerous records during the Late Holocene.Especially, the SST anomalies since 1 330 aBP closely match the changes in the frequency and intensity of El Ni??o events. Our analysis indicated that ENSO has driven the SST evolution at the southwestern end of the Okinawa Trough during the late Holocene by modulating the intensity of the Kuroshio, highlighting the crucial role of low-latitude processes in the transport of heat from the tropical western Pacific to midand high-latitudes.更多还原