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Arctic Oscillation (AO) and Antarctic Oscillation (AAO) are theleading modes of atmospheric circulation in mid-high latitudes.Previous studies have revealed that the climatic influences of thetwo modes are dominant in extra-tropical regions. This study findsthat AO and AAO signals are also well recorded in coral proxies inthe tropical South China Sea. There are significant interannualsignals of AO and AAO in the strontium (Sr) content, whichrepresents the sea surface temperature (SST). Among all the seasons,the most significant correlation occurs during winter in bothhemispheres: the strongest AO-Sr and AAO-Sr coral correlations occurin January and August, respectively. This study also determined thatthe Sr content lags behind AO and AAO by 1–3 months. Large-scaleanomalies in sea level pressure and horizontal wind at 850 hPa levelsupport the strength of AO/AAO-coral teleconnections. In addition, acomparison with oxygen isotope records from two coral sites inneighboring oceans yields significant AO and AAO signatures withsimilar time lags. These results help to better understand monsoonclimates and their teleconnection to high-latitude climate changes

Arctic and Antarctic Oscillation signatures in tropical coral proxies over the South China Sea