The 1997-1998 El Nino event recorded by a stalagmite from central China

摘要

The El Nino-Southern Oscillation (ENSO) is one of the most important oceanic and atmospheric phenomena that cause global climate variations. In this study, we reported a stalagmite delta O-18 record from Shizi cave in central China, which clearly shows a prominently positive variation during 1997-1998 CE. This delta O-18 variation correlates well with a thinner annual layer that indicates a decrease in the growth rate, possibly due to a reduction of the rainfall amount near our study site caused by the 1997-1998 El Nino event. This hypothesis is supported by a comparison of the variations of the rainfall amount near the study site in terms of the southern oscillation index (SOI) for the last 60 years, which indicates that almost all of the El Nino events lead to a reduced rainfall amount. The results suggest that speleothems deposited in central China may potentially reflect El Nino activity. (C) 2017 Elsevier Ltd and INQUA. All rights reserved.