中文摘要：

Historical La Nia events since 1950 are divided into Eastern Pacific(EP) type and Central Pacific(CP) type,and the SSTA developing features as well as the different responses of the tropical atmosphere are further analyzed by using multiple datasets.Classification of different types La Nia is based on the normalized Ni o3 and Ni o4 indices and the SSTA distribution pattern during the mature phase.The minimum negative SSTA for CP La Nia is located over the equatorial central Pacific near the dateline,more westward than that of EP La Nia.It has stronger intensity and larger east-west zonal difference of SSTA over the equatorial Pacific than EP La Nia.Influenced by the different SSTA distribution pattern,CP La Nia induces more westward location of the anomalous sinking motion and the anomalous low-level divergent and high-level convergent winds over the equatorial eastern Pacific.The different response of the tropical atmospheric circulation between EP and CP La Nia is more significant in the upper troposphere than in the lower troposphere.However,the tropical precipitation patterns during the mature phase of EP and CP La Nia are much similar,except the less(more) precipitation over the equatorial central Pacific(eastern Indian Ocean-western Pacific) during CP La Nia than during EP La Nia.

英文摘要：

Historical La Nifia events since 1950 are divided into Eastern Pacific （EP） type and Central Pacific （CP） type, and the SSTA developing features as well as the different responses of the tropical atmosphere are further analyzed by using multiple datasets. Classification of different types La Nina is based on the normalized Nifio3 and Nifio4 indices and the SSTA distribution pattern during the mature phase. The minimum negative SSTA for CP La Nina is located over the equatorial central Pacific near the dateline, more westward than that of EP La Nifia. It has stronger intensity and larger east-west zonal difference of SSTA over the equatorial Pacific than EP La Nifia. Influenced by the different SSTA distribution pattern, CP La Nifia induces more westward location of the anomalous sinking motion and the anomalous low-level divergent and high-level convergent winds over the equatorial eastern Pacific. The different response of the tropical atmospheric circulation between EP and CP La Nifia is more significant in the upper troposphere than in the lower troposphere. However, the tropical precipitation patterns during the mature phase of EP and CP La Nina are much similar, except the less （more） precipitation over the equatorial central Pacific （eastern Indian Ocean-western Pacific） during CP La Nina than during EP La Nina.