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Empirical orthogonal Function (EOF) analysis technique has been applied to monthly mean sea-level pressure (SLP) data of June, July and August from 1951 to 1980 to determine the SLP anomaly patterns associated with the monsoon and planetary components over the Asian continent and the Northern Pacific Ocean. The result shows that only a few EOF’s are needed to explain a large part of the variance for each series of fields. Among those EOF’s, two kinds of anomaly patterns can be identified: one is characterized by an opposition in sign of anomaly between the continent and the ocean; the other is marked with an opposite sign of anomaly between low and high latitudes, or with an alternative sign along the latitudinal zone from west to east. The former is confirmed to be related to summer monsoon and defined as monsoon component, whereas the latter is connected with the anomalies of westerlies or long waves in the westerlies and thus cosidered as planetary components. The possible influences of SST (sea surf
Empirical orthogonal Function (EOF) analysis technique has been applied to monthly mean sea-level pressure (SLP) data of June, July and August from 1951 to 1980 to determine the SLP anomaly patterns associated with the monsoon and planetary components over the Asian continent and the Northern Pacific Ocean. The result shows that only a few EOF’s are needed to explain a large part of the variance for each series of fields. Among those EOF’s, two kinds of anomaly patterns can be identified: one is characterized by an opposition in sign of anomaly between the continent and the ocean; the other is marked with an opposite sign of anomaly between low and high latitudes, or with an alternative sign along the latitudinal zone from west to east. The former is confirmed to be related to summer monsoon and defined the monsoon component, the latter is connected with the anomalies of westerlies or long waves in the westerlies and thus cosidered as planetary components. s of SST (sea surf