Arctic and Antarctic Oscillation signatures in tropical coral proxies over the South China Sea
Arctic and Antarctic Oscillation signatures in tropical coral proxies over the South China Sea
复制标题
南海热带珊瑚代理中的北极和南极涛动特征
DOI：
10.5194/angeo-27-1979-2009
复制
发表时间：
2009-01-01
影响因子：
1.9
通讯作者：
Ho, C. -H.
中科院分区：
文献类型：
--
作者：
Gong, D. -Y.;Kim, S. -J.;Ho, C. -H.
北极涛动（AO）和南极涛动（AAO）是中高纬度大气环流的主要模态。以往的研究表明，这两种模态的气候影响在热带以外地区占主导地位。本研究发现，AO和AAO信号也很好地记录在热带南海的珊瑚代理。Sr含量在代表海表温度（SST）的年际变化中具有明显的AO和AAO信号。在所有的季节中，最显着的相关性发生在冬季在两个半球：最强的AO-Sr和AAO-Sr珊瑚的相关性分别发生在1月和8月。这项研究还确定了Sr含量滞后于AO和AAO 1-3个月。海平面气压和850 hPa水平风的大尺度异常支持AO/AAO-珊瑚遥相关的强度。此外，与氧同位素记录从两个珊瑚网站在邻近的海洋产生显着的AO和AAO签名具有类似的时间滞后的比较。这些结果有助于更好地理解季风气候及其与高纬度气候变化的遥相关。
Arctic Oscillation (AO) and Antarctic Oscillation (AAO) are the leading modes of atmospheric circulation in mid-high latitudes. Previous studies have revealed that the climatic influences of the two modes are dominant in extra-tropical regions. This study finds that AO and AAO signals are also well recorded in coral proxies in the tropical South China Sea. There are significant interannual signals of AO and AAO in the strontium (Sr) content, which represents the sea surface temperature (SST). Among all the seasons, the most significant correlation occurs during winter in both hemispheres: the strongest AO-Sr and AAO-Sr coral correlations occur in January and August, respectively. This study also determined that the Sr content lags behind AO and AAO by 1-3 months. Large-scale anomalies in sea level pressure and horizontal wind at 850 hPa level support the strength of AO/AAO-coral teleconnections. In addition, a comparison with oxygen isotope records from two coral sites in neighboring oceans yields significant AO and AAO signatures with similar time lags. These results help to better understand monsoon climates and their teleconnection to high-latitude climate changes.