Analysis of temporal and spatial characteristics of correlations between the global circulation systems

The correlation matrixes are constructed based on the NCEP/NCAR global height field data and the surface pressure data and the characteristics of these two matrixes are analyzed. The results show that the correlations in all levels of height field are better in the middlelow latitudes regions and descend to the middlehigh latitudes regions, presenting the characteristics of quasizonal distribution; in the vertical direction, the correlations in the low levels are weaker and become more and more stronger with the increase in height; and there is always a negative correlation center in all levels of height field in the north Pacific region, reflecting a certain degree of particularity. The results of the delayed correlation show that the correlation is decreased with the increasing in the delayed days, the change of correlation gradually flats when the delayed time is 15 days and there is an obvious turning point at the time of 60 days. The fact that the correlation decreased with the increasing in delayed days and existence of the decay critical point provide a theory reference for the numerical prediction of 2 weeks or longer time scale. The decay rate of correlation in the circulation system reflects the feature that the higher the latitude is and/or the lower the level is the stronger the correlation is. Changes over time in the global average correlations for the three height fields and the surface pressure field are almost the same with abrupt changes occurred during 1978-1982 and 1996-1998.