末次盛冰期南京降水记录中ENSO的演化

The Evolution of ENSO During LGM from Precipitation Record in Nanjing

基于南京葫芦洞一支石笋TIMS-U系测年和纹层计数的交叉定年。获得丁末次盛冰期在24170～21222aBP时段石笋年纹层厚度的时间序列，主要反映了夏季风降水变率．小波分析揭示末次盛冰期连续3ka夏季风降水记录中厄尔尼诺一南方涛动（ENSO）周期和强度随时间的演化特征，该记录表明ENSO在末次盛冰期并非一直存在，有着高发期和平缓期。其爆发的频率和强度逐渐减弱。支持ENSO演化的“冰期阻尼效应”假说．

A glacial stalagmite chronology from Nanjing has been established by the TIMS-U series dating and annual band counting methods, The annually layering sequence spanning 3000a from 24170 to 21222 calendar years before present （aBP） was analyzed for evidence of Asian summer monsoon precipitation variability during Last Glacial Maximum （LGM）, Wavelet analysis reveals the variations in the frequency of occurrence and amplitude of E1 Nifio-Southern Oscillation （ENSO） during LGM. We found 5 ENSO blasting times with statistical significance. Decreasing frequency of occurrence and amplitude of ENSO probable support ＂glacial dampening＂, hypothesis of ENSO＇ s evolvement.