Map Of Local Pattern Analogue Coefficient (LPAC) And Its Application In Diagnostic Analysis Of Seasonal Transfer Of Monthly Mean Circulation

The definition of map of the Local Pattern Analogue Coefficient (LPAC) and its facture method are introduced detailedly in this paper. By using NCEP/NCAR reanalysis data of height and wind, The inter-monthly LPAC map , the climate LAPC map ,inter-annual anomaly map and mean variance map of monthly wind field of 850 and 500hPa and monthly height field of 850, 500, 150, 30hPa are calculated in a globe-belt area, which situates between 30° S and 75° N , from December 1957 to December 1997, according them we analysis the rule of the season transfer and anomaly of NH mean circulation .The results show that the climate map of LAPC can describe the seasonal transfer process of large scale circulation better .the advance process of summer circulation establish is form south to north at the middle and lower level of the troposphere, that is reflected primly in the inter-monthly wind and pressure map of LAPC; at lower lever of stratosphere, the establish process is simulate to that of troposphere, and reflect of process of that the South Asia High toward plateau; at middle stratosphere the summer circulation establish begins at middle and high latitude initially, and then transmits to low latitude gradually, while the seasonal variability in mid-stratosphere is stronger than it in troposphere and low-stratosphere. In addition, this paper primarily analysis the anomaly characteristic of 1980 and 1991 using the climate and anomaly map of LAPC.