Low Frequency Oscillations of Southern Hemispheric Critical Systems and Precipitation During Flood Season in South China

Zhang Ting; Wei Fengying; Han Xue

Vol.22, NO.3, 2011

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Zhang Ting, Wei Fengying, Han Xue. Low frequency oscillations of Southern Hemispheric critical systems and precipitation during flood season in South China. J Appl Meteor Sci, 2011, 22(3): 265-274.

Citation:

Zhang Ting, Wei Fengying, Han Xue. Low frequency oscillations of Southern Hemispheric critical systems and precipitation during flood season in South China. J Appl Meteor Sci, 2011, 22(3): 265-274.

Zhang Ting, Wei Fengying, Han Xue. Low frequency oscillations of Southern Hemispheric critical systems and precipitation during flood season in South China. J Appl Meteor Sci, 2011, 22(3): 265-274.

Citation:

Zhang Ting, Wei Fengying, Han Xue. Low frequency oscillations of Southern Hemispheric critical systems and precipitation during flood season in South China. J Appl Meteor Sci, 2011, 22(3): 265-274.

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Low Frequency Oscillations of Southern Hemispheric Critical Systems and Precipitation During Flood Season in South China

Zhang Ting^1,2,
Wei Fengying^{1
,
,},
Han Xue^1,3

1.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Jilin Provincial Climate Center, Changchun 130062
3.
National Marine Environmental Forecasting Center, Beijing 100081

Received Date: 2010-06-29
Rev Recd Date: 2011-03-21
Publish Date: 2011-06-30

Abstract

Abstract

By using daily precipitation data over South China and the NCEP/NCAR daily mean reanalysis data of SLP in Southern Hemisphere during 1960—2008, the low frequency oscillations of Southern Hemispheric critical systems and precipitation during raining seasons in South China are investigated by means of statistical method, for example, MTM-SVD, and so on. The LFV spectrum results show a 30—60 days low frequency oscillation and variation of 5—7 days for the precipitation during raining seasons in South China. Australian high in Southern Hemisphere can also be decomposed into 30—60 days low frequency oscillations, 10—20 days bi-weekly oscillations and variations of 5—7 days and 2—3 days. Mascarene high has 30—90 days low frequency oscillations and characteristics of bi-weekly oscillations. The MTM-SVD method can identify coupled spatial and temporal evolving signal by using both phase and amplitude information. Tracking the spatial and temporal coupling evolution of low-frequency oscillation with 30—60 days, it is found that the Mascarene and Australian high from strong to weak is corresponding to the rainy zone transfer from southwest to northeast in South China, and vice versa. South rain belt of precipitation in South China coincides with the variations and phase of the Mascarene and Australian high very well, but North rain belt is opposite with the Mascarene and Australian high. When the SLP of Mascarene and Australian high are positive from the usual, southern rain belt in South China is usually strong and northern rain belt tends to by weak, and vice versa.
- South China;
- precipitation during raining seasons;
- MTM-SVD;
- temporal reconstruction;
- spatial reconstruction

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References(28)

Figures and Tables

图 1 华南地区71个站点分布

Fig. 1 Distribution of 71 stations in South China

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图 2 华南汛期降水序列 (a)、澳大利亚高压强度 (b) 和马斯克林高压强度 (c) 小波变换

Fig. 2 Wavelet transform of precipitation during raining season in South China (a) with SLP of the Australian high (b) and the Mascarene high (c)

DownLoad: Full-Size Img PowerPoint

图 3 华南汛期降水 (a)、澳大利亚高压 (b) 和马斯克林高压 (c) 的LFV谱

(虚线分别代表 0.01, 0.05, 0.10和0.50显著性水平)

Fig. 3 The LFV spectrum of precipitation during raining season in South China (a) with SLP of the Australian high (b) and the Mascarene high (c)

(dashed lines represent the 0.01, 0.05, 0.10, 0.50 significant levels)

DownLoad: Full-Size Img PowerPoint

图 4 南半球SLP场和华南地区汛期降水45 d时间尺度耦合空间重建

Fig. 4 Spatial reconstruction of the joint SLP of the Southern Hemisphere and precipitation during raining season in South China at 45-day timescale

DownLoad: Full-Size Img PowerPoint

图 5 南半球SLP场和华南汛期降水的45 d长期趋势变化重建

Fig. 5 Temporal reconstruction of the joint SLP of Southern Hemisphere and precipitation during raining season in South China at 45-day timescale

DownLoad: Full-Size Img PowerPoint

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