南海夏季风暴发过程的低频特征
Characteristics of low-frequency oscillations during summer monsoon onset over the South China Sea
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摘要: 应用1979～1996年共18a的NOAA卫星OLR资料及NCEP/NCAR再分析850hPa风场资料,分析了夏季南海地区及南海季风暴发过程的某些低频特征。认为北半球夏季南海地区的低频活动较活跃,并且具有明显的年际变化,这种年际变化同南海季风的暴发时间有联系。南海地区的低频振荡在南海季风暴发后增强。通过对18a 及K*的时段叠加合成图的分析,发现南海夏季风的暴发同赤道印度洋低频振荡的东传及西太平洋低频扰动西传有密切联系,南海夏季风暴发期间南海地区将印度洋与西太平洋之间的低频活动联系在一起。Abstract: The NOAA OLR data and NCEP/NCAR reanalysis wind data at 850 hPa from 1979 to 1996 were used to analyze the characteristics of low-frequency oscillations (LFO) over the South China Sea (SCS) during the summer monsoon onset. It was demonstrated that the LFO over SCS was active in summer and had obvious interannual variability that was related with the monsoon onset over SCS. The LFO over SCS intensified after the monsoon onset. From 18 a composite analysis of and K*, we found that the monsoon onset over SCS was closely related with the eastward LFO propagation over the Indian Ocean and westward LFO propagation over the pacific Ocean, and the LFOs over Indian Ocean and Pacific Ocean were linked together in SCS region during the monsoon onset over SCS.
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Key words:
- Summer monsoon onset /
- SCS /
- low-frequency oscillations
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