High-resolution climate recorded in the δ13C of Porites lutea from Nansha Islands of China

摘要

＜正＞ A Porites Lutea core from Yongshu Reef of Nansha Islands covering 50-year growth history is analyzed for carbon iso-topic composition with monthly and seasonal resolution, and the results show that the coral δ13C generally has clear yearly cycles. The calibration indicates that the coral δ13C can record the sunshine duration, total cloud cast and rainfall of the Yongshu Reef, and it also shows significant association to El Nino events. From 1950 to 1999, the δ13C shows a clear long-term declining trend, which indicates a decrease in the sunshine duration and an increase in cloud cast and rainfall over Yongshu Reef over the past fifty years.