南海东北海域海面高度的多尺度变异
The multi-scale variability of sea surface height in the northeastern South China Sea
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摘要: 利用8a的TOPEX/Poseidon高度计资料,采用小波分析方法,研究南海东北部海域海面高度的多尺度变异.研究得出,南海东北部海域的海面高度变化主要受3个不同时间尺度因素的影响,其中最强的是季节变化(Va)的影响,其周期范围为0.60～1.20a,它主要与海面高度的年循环相联系;其次是周期在0.17～0.45a(即2～5个月)的变化(V25)的影响,它主要与中尺度时间周期引起的海面高度变化相联系.较小的一个因素是周期在1 50～5 00a的年际变化(Vi)的影响,它主要与El Niño事件引起的海面高度变化相联系.分析表明对8a平均而言,海面高度变化所引起的能量偏差V25的高值区主要分布在吕宋海峡以西海域,在1995,1996和1999年出现最大值;偏差Va的高值区分布在吕宋岛西北海域,在1995年出现最大值;年际偏差Vi的高值区位于台湾的西南海域,在1997～1998年El Niño事件期间达到最大.Abstract: The wavelet transformation methods were applied to 8 a(1993~2000)TOPEX/Poseidon data set to investigate the multiple time-scale variability of sea surface height(SSH)in the northeastern South China Sea(SCS). Analysis results indicate that SSH variation mainly subjects to influences from three factors of different time-scale. Among them,the seasonal variation(Va),with period range from 0.60 to 1.20 a,appears to be the strongest, which mainly relates to seasonal cycling of SSH.Secondly,the variation(V25),with period range from 0.17 to 0.45 a(i.e.,of 2~5 months period),mainly relates to SSH variation caused by mesoscale phenomena.Arelatively weak factor is the interannual variation(Vi)with period range from 1.50 to 5.00 a,w hich mainly associates with SSH changes of El Niño events.Analyses also show that,from eight years mean distribution,high variation areas of energy variance V25 appears mainly to the west of Luzon Strait with energy maximums in 1995,1996 and 1999.Areas of high Va appear in the sea area northwest off Luzon Island show a energy peak in 1995.And high variation areas of inter annual variance Vi are located to southwest of Taiwan Island which reaches energy maximum during the 1997/1998 El Niño event period.
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