三沙市美济礁滨珊瑚记录的近百年海面温度变化

利用南沙群岛美济礁滨珊瑚Sr/Ca建立与海面温度（SST）的关系式，后报近百年南沙群岛海区高分辨率的SST序列。结果显示：美济礁近百年SST的年平均值为28.4℃，最高值为29.2℃（1998 AD），最低值为27.6℃（1917 AD），相差1.6℃。近百年SST呈增暖趋势，升温速率为0.025℃/10 a，但存在年代际的温度波动，其中1906―1927 AD呈降温态势，1928―1938 AD呈增温态势，1939―1957 AD呈降温态势，1958年后SST呈波动上升趋势。近百年SST呈现3.5 a、33 a周期，显示受ENSO和太平洋年代际涛动（PDO）影响。

Sea Surface Temperature Variations during the Last 100 Years Recorded in a Porites Coral from the Mischief Reef of Sansha City

Sea surface temperature (SST) variation over the last 100 years was reconstructed with high-resolution Sr/Ca of a Porites coral from the Mischief Reef, Sansha City. The results showed that the annual average SST from 1906 to 2007 AD was 28.4°C with the maximum of 29.2°C in 1998 AD and the minimum of 27.6°C in 1917 AD. The SST of the Nansha Islands increased by 0.025°C/10 a during this period, similar to that of the Xisha Islands. The SST series displayed a significant decadal oscillation with a period of 33 years, suggesting a possible linkage between the SST and the Pacific Decadal Oscillation. In addition, in the years when ENSO occurred, the SST was high, indicating the influence of ENSO in this area. In this paper, a Sr/Ca-SST relation was first established for the Mischief Reef and then the high-resolution SST record was extended to more than 100 years in this area. The SST variations were characterized and related mechanisms were explored.