东亚季风区冬季经向风的季节内变化及其可能机理
投稿时间: 2017-08-05  最后修改时间: 2017-10-11  点此下载全文
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作者单位E-mail
李华凝 南京信息工程大学 353220281@qq.com 
姚素香 南京信息工程大学 yaosx@nuist.edu.cn 
储鹏 中国民用航空华东地区空中交通管理局江苏分局 南京禄口国际机场航管楼  
基金项目:国家重点基础研究发展计划(973计划);国家教育部回国人员科研启动基金
中文摘要:利用1979-2013年ERA-interim再分析资料,通过均方差分析、功率谱分析、滤波及合成分析等统计方法系统地分析了东亚季风区冬季经向风的季节内变化及其可能机理。结果表明,东亚季风区冬季经向风异常在我国华南一带变化显著,振荡周期为10-20天(准双周振荡QBWO)。在准双周尺度上850hPa异常北风主要呈现从高纬向低纬传播的特点,60癗附近异常经向风向东南传播,副热带30癗附近弱的异常经向风向东传播,在华南汇合,随后分为两支中心,分别向南和向东继续传播,我国华南一带存在基本气流向准双周尺度波动能量的转换,因此异常经向风在华南会显著增强。我国东部上空300hPa也存在经向风准双周振荡的大值中心,副热带地区波动比850hPa更为明显,60癗附近波动向东南方向移动,同样在我国东部地区合并,来自于欧洲的Rossby波东传与来自于北太平洋的Rossby波向西传播,在150癊附近辐合导致波动能量的增强。
中文关键词:东亚季风区  经向风  季节内变化  传播特征
 
Intraseasonal Variation of Winter Meridional Wind in East Asian Monsoon Region and Its Possible Mechanism
Abstract:Based on the ERA-interim reanalysis data from 1979 to 2013 year, through mean-variance analysis, power spectrum analysis, filtering and synthesis analysis and other statistical methods, to systematically analyze intraseasonal variation and its possible mechanism of winter meridional wind in East Asian monsoon region. The results have shown that winter meridional wind anomaly in East Asian monsoon area in Southern China area changes significantly, the oscillation period is 10-20 days (quasi-biweekly oscillation QBWO). On a quasi-biweekly scale, 850hPa anomalous north wind shows the characteristics of the spreading from the high latitude to the low latitude, anomalous meridional wind near 60?N spreads in the direction of southeast, the weak anomalous meridional wind near 30癗 in subtropical zone spreads eastward, they converge in South China, then fall into two centers, respectively continue to spread southward and eastward, in Southern China area, there exists conversion from basic air flow to quasi-biweekly scale fluctuation energy, therefore, anomalous meridional wind will enhance significantly in Southern China. 300hPa in the top of the eastern part of China, there are also large value center of meridional wind quasi-biweekly oscillation, the fluctuations of the subtropical regions are more obvious than 850hPa, the fluctuations near 60癗 move to the southeast, similarly merging in the eastern part of China, the Rossby waves from Europe spread eastward and the Rossby waves from the North Pacific spread westward, their convergence near 150癊 results in an increase of fluctuation energy.
keywords:East Asian monsoon region  meridional wind  intraseasonal variation  propagation characteristics
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