| 东亚夏季风过程大气低频振荡的数值模拟研究 |
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| 引用本文： | 倪文琪,蒋国荣.东亚夏季风过程大气低频振荡的数值模拟研究[J].热带气象学报,2010,26(1):93-97. |
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| 作者姓名： | 倪文琪 蒋国荣 |
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| 作者单位： | 1. 总参气象水文空间天气总站,北京,100081
2. 解放军理工大学气象学院,江苏,南京,211101 |
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| 摘 要： | 利用区域气候模式RegCM3对东亚夏季风及其中的大气低频振荡(LFO)进行了模拟研究。(1)进行控制试验,借助Lanczos带通滤波等方法分析了实测及模拟结果LFO强度和传播等特征,检验RegCM3对夏季风LFO的模拟能力;(2)通过增、减南海表面海温两个敏感试验探讨海温异常变化对LFO各特征的影响,并探究异常海温下的LFO与季风爆发时间的可能联系。结果表明:季风LFO强值集中在低纬地区,低纬夏季强冬季弱,高纬则相反。季风爆发前后的发生南传向北传的转换。模式RegCM3对季风区LFO基本特征有较好的把握,但高纬地区偏强。南海异常增(减)温有利于季风提前(推迟)爆发,也有利于LFO传向发生转换时间的提前(推迟)。说明季风爆发时间与LFO传向转换存在一定联系。两个试验均有使振荡能量大值区南移的趋势,且通过LFO的变化造成较高纬地区季风后期的气候异常。
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| 关 键 词： | RegCM3 东亚季风 低频振荡（LFO） 传向转换 季风爆发 |
A NUMERICAL STUDY OF ATMOSPHRIC LOW FREQUENCY OSCILLATION DURING THE EAST ASIA MONSOON PROCESS |
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| NI Wen-qi,JIANG Guo-rong.A NUMERICAL STUDY OF ATMOSPHRIC LOW FREQUENCY OSCILLATION DURING THE EAST ASIA MONSOON PROCESS[J].Journal of Tropical Meteorology,2010,26(1):93-97. |
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| Authors: | NI Wen-qi JIANG Guo-rong |
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| Abstract: | The regional climate model RegCM3 is used here to study the East Asian summer monsoon and its atmospheric low-frequency oscillation(LFO). First, a control experiment was conducted to analyze the intensity and other characteristics of LFO with the help of Lanczos pass filter of both NCEP data and simulation results, and test the simulation capability of RegCM3 with regard to LFO during the summer monsoon. Secondly, two sensitivity tests were performed in which the surface temperature of the South China Sea was either increased or decreased to discuss the change of LFO and possible relationships between LFO and monsoon onset time. The results show that the intensity of LFO was high mainly in the low latitudes and stronger in summer than in winter, and otherwise was true for high latitudes. There was a change in the propagation direction of LFO from southward to northward around the time of monsoon onset. RegCM3 has the ability of simulating the basic characteristic of LFO, but performs better in high latitudes. Anomalously high(low) temperature of South China Sea is favorable for bringing the outbreak of the monsoon forward (backward), while anomalously high(low) temperature is also favorable for pushing the shift of LFO propagation direction forward(backward). It shows that there must be some relationships between the onset of monsoon and LFO change in propagation direction. Both tests tend to move areas of strong oscillation southward and affect the climate anomalies of high latitudes during the late monsoon stage through LFO changes. |
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| Keywords: | RegCM3 RegCM3 East Asian monsoon low-frequency oscillation (LFO) change of propagation direction monsoon outbreak |
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