DIAGNOSIS ON LOW FREQUENCY COMPONENT OF ENSO VARIABILITY-PART Ⅱ:ORIGIN OF THE COMPONENT |
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作者姓名: | Zou Li Ni Yunqi |
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作者单位: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093;Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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摘 要: | Diagnosis is undertaken on the origin for the low-frequency component(LFC) of ENSO variability in the context of 1979-1990 OLR and u-wind datasets.Evidence suggests that ① a power spectrum-yielded maximum,significant statistically,is derived from the OLR monthly anomalies in a 3-5-year period range over the tropical central/western Pacific;②compositean alysis of the signals of the monthly anomaly low frequency component(period>3 years) confirms further the dynamic features of the component as documented in Part Ⅰ:③serving as forcing on ENSO,the related monsoon region represents the source area of the component;④the one-point correlation maps of unfiltered OLR monthly anomalies with zonal wind on a lagged,a simultaneous and a leading basis show clearly the close relation between the u wind-associated eastward travelling low-frequency wave and the low-frequency oscillation of low-latitude central/western Pacific large-scale convection and the east-moving mode is likely to be excited by the oscillation at a 3-5-year period range.It follows that the large-scale convection oscillation shows up as the origin of the eastward waves,i.e.,ENSO LFC.
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收稿时间: | 1995/12/18 0:00:00 |
修稿时间: | 1996/10/7 0:00:00 |
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