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利用观测资料研究发现,东亚-北印度洋对流层热力差异指数(East Asian-North Indian Ocean index,IEANI)与东亚夏季风及相应的中国东部季风降水都具有密切的关系.当IEANI偏高(低)时,东亚中纬度夏季风偏强(弱),华北地区降水偏多(少),江南地区降水偏少(多).为了研究东亚夏季风的长期变化特征,我们利用北京和澳大利亚塔斯曼尼亚地区的重建气温回归了BC665～AD1985年的IEANI.研究发现,在过去2000多年里,重建的IEANI总体上能够指示世纪尺度上的东亚夏季风变化和中国东部降水异常.重建的IEANI与中国东部降水的关系与现代气候所表现出来的关系非常相似,表明这种相关特征也出现在过去2000多年来的世纪尺度上.对于IEANI在更长时间尺度(数百至千年)上的变化特征及其与降水的关系,尚需利用更多类型的代用资料进一步验证.
Based on the observed data, it is found that the East Asian-North Indian Ocean index (IEANI) is closely related to the East Asian summer monsoon and the corresponding monsoon precipitation in eastern China. When IEANI is high (low) (Lower) in the northern part of China, and less (more) precipitation in the southern part of the Yangtze River.In order to study the long-term variation of the East Asian summer monsoon, The reconstructed air temperature returned to IEANI in BC665 ~ AD in 1985. The study found that in the past 2000 years, the reconstructed IEANI can generally indicate the change of the East Asian summer monsoon on a century scale and the precipitation anomalies in eastern China. The relationship between the reconstructed IEANI and precipitation in eastern China The correlation with the modern climate is very similar, indicating that this related feature also appears in the century scale over the past 2000 years.For IEANI in the longer time scale (hundreds to thousands of years) and its characteristics of precipitation and precipitation Relationship, still need to use more types of proxy data for further verification.