LIAO Hongtao,XIAO Tiangui,WEI Wei,et al.Low Frequency Wave Packet Propagation Characteristics in East Asian Meiyu Season[J].Journal of Chengdu University of Information Technology,2019,(02):143-148.[doi:10.16836/j.cnki.jcuit.2019.02.008]
东亚梅雨季低频波波包传播特征
- Title:
- Low Frequency Wave Packet Propagation Characteristics in East Asian Meiyu Season
- 文章编号:
- 2096-1618(2019)02-0143-06
- Keywords:
- meteorology; East Asian monsoon; low frequency oscillation; South China Sea summer monsoon; WPD; Meiyu anomaly
- 分类号:
- P458.1+21
- 文献标志码:
- A
- 摘要:
- 利用1976-2016年41 a NCEP/NCAR再分析日平均资料和中国2426站20~20时日降水量资料,使用带通滤波以及波包传播的诊断方法分析了10~20 d低频波波包分布和传播特征,并进一步研究了典型梅雨异常年(1998年和2002年)梅雨季低频扰动能量的传播特征,提高对10~20 d低频扰动能量的认识,进而提高中期延伸期的天气预报水平。研究表明,南半球低频波波包值高于北半球; 低频波波包呈经向传播,冬季低频波波包高值中心基本位于高纬度地区,到了夏季,高纬度地区低频波波包向低纬度赤道方向移动。梅雨典型异常年波包的纬向和经向传播表明,丰梅年长江中下游地区扰动能量纬向上主要受来自太平洋中部西传累积的影响,经向上受来自蒙古高原向南传播累积的影响。枯梅年则正好相反。
- Abstract:
- Using 41 years from 1976 to 2016 NCEP / NCAR reanalysis data and the daily average of 20-20 precipitation data from 2426 stations, and band-pass filtering and wave packet propagation diagnostic methods were used to analyze the distribution and propagation characteristics of low-frequency wave packets in 10-20 d. Moreover, the propagation characteristics of low-frequency disturbance energy in the Meiyu rainy season(1998 and 2002)were further studied, which improves our understanding of the low-frequency disturbance energy of 10-20 d, and then improves the forecasting level of the medium-term extension period. Studies have shown that the low-frequency waves in the southern hemisphere are higher than in the northern hemisphere; The low-frequency wave packet is transmitted through the meridional direction. The low-frequency wave package center in winter is basically located in the high latitude area. In summer, the low-frequency wave package moves toward the low latitude equator in the high latitudes. The latitudinal and meridional propagation of the typical anomalous wave packets in the Meiyu period indicates that the disturbance energy latitude in the middle and lower reaches of the Yangtze River in the Fengmei year is mainly affected by the accumulation of the westward spreading from the middle Pacific, and the upward propagation is influenced by the propagation from the Mongolian plateau to the south. The year of dry plum is exactly the opposite.
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备注/Memo
收稿日期:2018-05-11 基金项目:国家自然科学基金资助项目(91337215、41575066); 国家科技支撑计划资助项目(2015BAC03B05); 全国大学生创新训练计划资助项目(201610621033)