Characteristic Analysis Of Global Disturbed Energy Distribution In Different Time-scales

The global disturbed energy percentage distributions in different time-scale are investigated using NCEP/NCAR reanalysis data for 49 years (1958-2006) of 200hPa/850hPa wind and potential height. The spatial and temporal global character of the disturbed energy percentage in the synoptic scale and intraseasonal scale are also studied using EOF analysis method.?The percentage of disturbed energy is used to study the global spatial distribution of disturbed character, which is calculated using the disturbed energy in different time-scales by the total disturbed energy, so the distributions not only show the disturbed energy differences among different regions, but also the effect magnitude of the different time-scale systems in local climate change. The spatial distributions of the disturbed energy are different in the different time-scales, which denote the different part of the atmospheric circulation character.The disturbed energies in synoptic scale are high in high latitudes and low in low latitudes both in 850hPa and 200hPa wind field, as well as in potential height field. The distributions of the disturbed energy calculated by wind data indicate some connection with those calculated by potential height data. The results show that there are some relationship between the spatial distributions of the synoptic disturbed energy percentage and the locations of the monthly mean trough or ridge.The maximum of the disturbed energy in the intraseasonal scale locates in the Bengal Bay and the warm-water regions in both hemispheres in 850hPa wind field; the maximum in 200hPa wind field locates in high latitude and the low latitude off the equator; the maximum in 850hPa potential height field locates in high latitude of the Northern Hemisphere and middle latitudes in Southern Hemisphere; the maximum in 200hPa potential height field locates in high latitudes of the Northern Hemisphere and the southern sea region of the southern America in South Hemisphere. This distribution are in accordance with some results have been confirmed, and also some differences.The most disturbed energies in interannual scale almost locate in low tropical latitude regions. The maximum of the disturbed energy in 850hPa wind field locates in middle tropical Pacific Ocean, the second locates in east part of the Africa; The maximum of the disturbed energy in 200hPa wind field also locates in middle tropical Pacific Ocean, which more extends to the east; the maximum in 850hPa potential height field locates in Indonesia region; the maximum in 200hPa potential height field locates in east tropical Pacific Ocean, which is also the maximum in 850hPa /200hPa wind and potential height field.The most disturbed energies in intra-decadal scale are also active in the low tropical latitude region. The maximum of the disturbed energy in intra-decadal scale is in the east part of the Africa in 850hPa wind field; the maximum in 200hPa wind field locates in east tropical Pacific Ocean; the maximum in 850hPa potential height field locates in east part of Africa; the maximum in 200hPa potential height field locates in Indonesia area, the second locates in the tropical Atlantic Ocean. The spatial distributions caused by the inter-annual and intra-decadal scale through planetary wave triggered by convective heating in the tropical ocean in the climate change are distinct different.The EOF analysis of disturbed energy in synoptic and intraseasonal scale shows that the spatial distributions are almost similar with the long-term mean result, and have the inter-annual and intra-decadal period. It also indicates that the inter-annual and intra-decadal scale systems play a strong influence to synoptic and intraseasonal scale system.