Pacific Decadal Oscillation (PDO) is a long-term ENSO-like variability of theNorth Pacific. It is the first principal component of EOF of the North Pacific SST. ENSO is thestrongest signal of annular change of global ...Pacific Decadal Oscillation (PDO) is a long-term ENSO-like variability of theNorth Pacific. It is the first principal component of EOF of the North Pacific SST. ENSO is thestrongest signal of annular change of global climate system. Empirical Mode Decomposition (EMD)method is applied to two types of indices. One type of index is the Pacific Decadal Oscillation(PDO) index that represents a long-term ENSO-like variability of the North Pacific. The other typeof indices such as Southern Oscillation (SO) index, Ninol+2 SST, Nino3 SST, Nino4 SST and Nino3.4SST represents ENSO. The relationship between two types of indices shows the temporalcharacteristics and relationships between the two phenomena. It is found that, for PDO, the goodcorrelations with ENSO only exist on the quasi-2-7-yr timescales and decadal and multi-decadaltimescales, suggesting that a close relationship between PDO and ENSO only exists among some specialintrinsic mode functions at lower frequency band.展开更多
基金This work is jointly supported by the National Natural Science Foundation of China under Grant Nos. 40233028, 40075017.
文摘Pacific Decadal Oscillation (PDO) is a long-term ENSO-like variability of theNorth Pacific. It is the first principal component of EOF of the North Pacific SST. ENSO is thestrongest signal of annular change of global climate system. Empirical Mode Decomposition (EMD)method is applied to two types of indices. One type of index is the Pacific Decadal Oscillation(PDO) index that represents a long-term ENSO-like variability of the North Pacific. The other typeof indices such as Southern Oscillation (SO) index, Ninol+2 SST, Nino3 SST, Nino4 SST and Nino3.4SST represents ENSO. The relationship between two types of indices shows the temporalcharacteristics and relationships between the two phenomena. It is found that, for PDO, the goodcorrelations with ENSO only exist on the quasi-2-7-yr timescales and decadal and multi-decadaltimescales, suggesting that a close relationship between PDO and ENSO only exists among some specialintrinsic mode functions at lower frequency band.
