3篇
您的检索式：作者名="DAIXingang"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Multiscale characteristics of the rainy season rainfall and interdecadal decaying of summer monsoon in North China显示文摘This paper focuses on the rainfall spectrum and its evolution of North China in rainy season with summer monsoon decaying in interdecadal time scale. The interan-nual component of the rainfall is the dominant part, ac-counting for 85% of the total variance, and has been changed significantly during the last 30 years. According to wavelet analysis its 5a periodic spectrum suddenly disappeared in the late 1960s, and its biennial oscillation gradually become weaker and weaker since 1970, accompanied by the summer monsoon decaying. Contrarily, the interdecadal component is principal in the summer monsoon over North China and is very similar to the counterpart of the rainfall. Their interde-cadal parts are significantly correlated, and the correlation coefficient is nearly equal to the one of the original sequences. Besides, the dry and wet climate alternated with the mon-soon abrupt changes in the 1960s and the 1970s over East Asia, apart from North China, climate drifted from a light drought to a severe drought during the past 30 years. | DAIXingang WANGPing CHOUJifan | 2003 | Chinese Science Bulletin2003，48，24： | 32 |
| 2 | Rainfall spectrum change in North China and its possible mechanism显示文摘The seasonal distribution of the rainfall in North China has changed greatly since 1977, with more rainfall in spring and less in July, August, and September (JAS). Wavelet analysis showed that the JAS rainfall underwent an abrupt spectrum change in the mid-1960s. Its interannual variability has declined while the interdecadal component has become the dominant mode, associated with the dry climate. Correlation analysis found that the JAS rainfall is negatively correlated with the departures of the 500 hPa geopotential height significantly over the northwest and southwest of China, and positively correlated with the summer monsoon over eastern China. Therefore, the interdecadal ascending of the air pressure in northwestern China and the monsoon decaying over East Asia in the past 20 years may be the two major causes of North China drought. | DAIXingang WANGPing ZHANGPeiqun CHOUJifan | 2004 | Progress in Natural Science:Materials International2004，14，7： | 7 |
| 3 | A quasi-geostrophic wavelet-spectrum model for barotropic atmosphere and its numerical solution显示文摘A quasi-geostrophic wavelet-spectrum model of barotropic atmosphere has been constructed by wavelet-Galerkin method with the periodic orthogonal wavelet bases. In this study a wavelet grid-spectrum transform method is designed to decrease the tremendous computation of the nonlinear interaction term in the model, and a two-dimensional Helmholtz equation from the model in a wavelet spectrum form is derived, and a solution with high precision under the periodic boundary condition is obtained. The numerical investigation manifests that the wavelet-spectrum model (WSM) could keep on running for a long time under the forcing of heating and topography. Although its numerical solution is compatible with the grid model (GM), the WSM is of a higher precision and faster convergence rate than GM’s. A stationary solution comes forth when the model is forced only by the surface heating, whereas a quasi-periodic oscillation with a period about 15 days appears as considering the topography in the model. The latter oscillation, to some extent, is very similar to the Rossby index cycle of atmosphere over middle and high latitudes. | DAIXingang WANGPing CHOUJifan | 2004 | Progress in Natural Science:Materials International2004，14，11： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员