500hPa全球动能年际变率及1983和1987年两个厄尼诺年动能距平的差异
ON THE INTERANNUAL VARIABILITY IN GLOBAL KINETIC ENERGY AT 500hPa AND THE DIFFERENCE IN ENERGY ANOMALIES BETWEEN THE TWO EI NIÑO YEARS OF 1983 AND 1987
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摘要: 利用1980-1988年9年期间ECMWF500hPa全球风场资料,计算7个“纬度带”上三种基本动能模态,研究这些动能模态的各年异常情况。结果表明,1983年是这9年内动能唯一的正值异常年,而1987年和1985年动能基本上属于正常年,只有个别动能模态有异常。这说明,1980年代两个厄尼诺年的异常情况有很大的差异。动能模态与赤道东太平洋海温距平(SSTA)的后延相关表明,1983年事件的影响可以波及范围相当广泛甚至波及全球大气,而1987年事件所能影响的范围远比1983年事件要小。此外,还表明北半球副热带急流轴附近是对SSTA响应的敏感地区。Abstract: Using the materials of 21 kinetic energy items (abbreviated to KED which are incorporated seven latitudinal belts with three primary energy modes, at 500hPa in the whole range of the globe during the 9 years of 1980-1988, the anomaly in kinetic energy for each year is investigaed. The annual anomaly was classified into four grades, i.e. anomalous, subanomalous, fair average anomalous and approximately normal. It is shown that 1983 was the only anomalous year during the nine years studied, but the 1987 El Ninño year and the 1985 La Nina year both belonged to the approximately normal one. So, there are great differences in the grade of the energy anomaly between the two El Ninño years during eighties. The main KEIs by which the anomalies were characterized during the three event years, all are very high lag-cross correlation coefficients with SSTA in the equatorial eastern Pacific. It is shown that the anomalies of these KEIs responded to the three events. Besides, it is also shown that the northern subtropical jet is a sensitive region to respond to the SSTA. In responses to the three events there were three different typical character in the subtropical jet.
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Keywords:
- El Ninñ /
- o /
- Global kinetic energy
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