检索结果-南通市图书馆

Computational stability of the forced dissipative nonlinear {2. equations

在线全文

学校读者我要写书评

暂无评论

引用

chinese Science Bulletin 1999年第10期44卷 949-952页

作者： li jianping and {2. jifan lasg , institute of atmospheric physics , chinese academy of sciences , beijing 100080, china Department of atmospheric sciences , Lanzhou University , Lanzhou 730000, china beijing Meteorological College, beijing 100081, china lasg Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of atmospheric sciences Lanzhou University Lanzhou China beijing Meteorological College Beijing China

A new concept of computational quasi-stability (CQS) is introduced to study the computational stability (CS) of the forced dissipative nonlinear (FDN) evolution equations. Based on the concept, the CQS criterion of difference scheme of FDN atmospheric equations is obtained. So it provides the theoretical basis for designing the computational stable difference scheme of FDN atmospheric equations.

关键词： computational stability (CS) computational quasi-stability (CQS) operator equation difference scheme forced dissipative nonlinear (FDN) equations.

Operator constraint principle for simplifying atmospheric dynamical equations

在线全文

学校读者我要写书评

暂无评论

引用

chinese Science Bulletin 2001年第12期46卷 1053-1056页

作者： li jianping & {2. jifan1. National Key Laboratory of atmospheric sciences and Geophysical Fluid Dynamics (lasg), institute of atmospheric physics, chinese academy of sciences, beijing 10002., china 2. Department of atmospheric sciences, Lanzhou University, Lanzhou 730000, china National Key Laboratory of atmospheric sciences and Geophysical Fluid Dynamics ({2.) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Department of atmospheric sciences Lanzhou University Lanzhou China

Based on the qualitative theory of atmospheric dynamical equations, a new method for simplifying equations, the operator constraint principle, is presented. The general rule of the method and its mathematical strictness are discussed. Moreover, the way that how to use the method to simplify equations rationally and how to get the simplified equations with harmonious and consistent dynamics is given.

关键词： simplification operator equation operator constraint principle.

Large-scale low-frequency rainfall regimes and their transition modes in summertime over china

在线全文

学校读者我要写书评

暂无评论

引用

chinese Science Bulletin 2006年第11期51卷 1355-1367页

作者： REN Hongli ZHANG Peiqun chou {2. li Weijing GAO li College of atmospheric sciences Lanzhou University Lanzhou 730000 China Laboratory for Climate Studies National Climate Centre China Meteorological Administration Beijing 100081 China lasg Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Seven large-scale low-frequency rainfall regimes (LFRRs) in summertime are identified for china in a 10-dimensional phase space by using a 40-year daily precipitation dataset. Corresponding to the local extrema of observed probability density in phase space, the LFRRs are characterized by the persistence and transitions that reflect the spread and jump features of low-frequency rainfall centers. The LFRRs are generally consistent with summer monsoon rainbelts on the intraseasonal timescale, and there exist the preferred transition relationships between the LFRRs. Four LFRRs’ transition modes (LFRRTMs), which are the dominant components of the interannual and intraseasonal variability of sum- mer rainfall in china, are further induced. Analyses of atmospheric circulation system show that the anomalies of the subtropical high over the western Pacific (SHWP) and blockings in mid-high latitudes, the low-latitude circulation anomalies, and the wavetrains over the East Asia-Pacific region (EAPWs), play crucial roles in the occurrence and transitions of the LFRRs. Moreover, the evolution of the SHWP and blockings, the distribution and movement of the EAPWs, and the intraseasonal variability of the East Asian-Pacific jet stream may be principal factors of the formations of the LFRRTMs.

关键词：夏季降雨相空间低频降雨体系大尺度预报