ENSO事件与北半球中高纬低频振荡

邱明宇; 陆维松; 王尚荣

ENSO事件与北半球中高纬低频振荡

1.
海南省气象局, 海南, 海口, 570203
2.
南京信息工程大学大气科学系, 江苏, 南京, 210044

基金项目: 国家自然科学基金(40275016);江苏省“六大人才高峰”行动计划基金项目共同资助

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出版历程
- 收稿日期: 2005-07-12
- 修回日期: 2006-03-09

ENSO EPISODES AND LOW-FREQUENCY OSCILLATION IN THE EXTRA-TROPICAL LATITUDE OF THE NORTHERN HEMISPHERE

1.
Hainan meteorological bureau, Haikou 570203, China
2.
Department of Atmospheric Sciences, NUIST, Nanjing 210044, China

摘要

摘要: 采用诊断方法研究了El Niño和La Niña事件与北半球中高纬大气低频振荡。用1950-2003年北半球中高纬逐日500 hPa高度场资料进行功率谱分析得出:(1)ENSO事件对中高纬大气低频振荡有调频作用,即夏季低频振荡较弱,冬季低频振荡较强。(2)El Niño(La Niña)事件有使低频振荡周期缩短(延长)的趋势。(3)ENSO事件对中高纬大气低频振荡的调频作用比中低纬明显。
- 调频作用 /
- 大气低频振荡 /
- 功率谱分析 /
- ENSO
Abstract: A diagnostic analysis is carried out to investigate the relationship of ENSO episodes and the atmospheric low-frequency oscillation (LFO) in the mid-high latitudes of the Northern Hemisphere.The power spectral analysis is performed for the daily 500 hPa height field data in the mid-high latitudes of the Northern Hemisphere from 1950 to 2003.The results show that:(1) ENSO episodes have the frequency modulation effect on low-frequency oscillation (LFO) in the extra-tropical latitudes of the Northern Hemisphere,i.e.Intensity of low-frequency oscillation in winter is stronger than that in summer.(2) The main period of low-frequency oscillation show the shortened (lengthened) tendency during E1 Niño (La Niña) episodes.(3) The frequency modulation effect of ENSO episodes on atmospheric low-frequency oscillation (LFO) in the mid-high latitudes is clearer than that in the mid-low latitudes.
- frequency modulation /
- low-frequency oscillation /
- power spectral analysis /
- ENSO

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参考文献(19)

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