The series of the Southern Oscillation Index (SOI) published by US CAC is extended from 1935 back to 1857 using the sea level pressure differences belween Tahiti and Darwin. The periodicities-of SOI and,its -relationship to the SST are examined.

• 本文利用塔希提和达尔文的气压差将美国气候分析中心的SOI序列从1935年向前接补到1857年,并用SOI周期及其与SST的关系进行了检验,证明可以将两段SOI接续起来。