| Climate chang over the past2000years are important part of the climate research, especially climate evolution in nearly years. During this period have some significant climate fluctuations, such as the Medieval Warm Period, the Little Ice Age and the20th century warming, they are all hot spots of the global climate and environment research. The Little Ice Age is a short climate cooling events between the Medieval Warm Period and the20th century warming period, its climate background is special, so to clear up characteristics of the Little Ice Age, such as onset and ending time, internal structure and forcing mechanism, will help to predict climate change of the future.Based on16230Th ages and1376annual thickness dates of three stalagmites from Xiniu Cave in Hubei province, provide a high resolution annual thickness of three stalagmites respectively. It’s found that very good consistency on overall trend and details in annual layers of three stalagmites. Through the normalized obtain a relatively complete record from1180to1905AD. The onset of LIA is identified in our record at about1365AD, lasted until to1710AD in Hubei province. The Little Ice Age is characterized by two weaker monsoon events and a relative stronger monsoon event, including more sub-fluctuations. Comparison of the Xiniu cave records with the records of Heshang cave, Longquan cave and Jhumar cave, show that synchronous characteristics of the structure and transformation in overlapping time, suggesting that climate has consistency in large range. And found that the cooling event in17th century is mild.There are many factors of the forcing of the Little Ice Age, the solar activity and volcanic eruptions are two controversial factors. Contract stalagmites layer thickness with solar activity and volcanic, suggesting that stalagmite growth may be major controlled by solar activity and lagging behind volcanic activity. In addition, natural changes, greenhouse gas concentrations and human activity, should not be ignored. |
PDF Full Text Request