Analysis on the meteorological backgrounds for the great events of Nilarparvata lugens long-distance migration northward during midsummers in China;

The results showed that the differen t kind of geological disaster matches the different geographical distribution and the synoptic background.

The synoptic background,meteorological factor field and comfort index of Tianjins’ daily maximum electrical load process in Summer from 2002 to 2005 are discussed by the synoptic method.

The climate background of ecosystem managing in the north Shaanxi;

Climate background analysis of convective weather was the foundation of nowcasting,which was the necessary to Olympics weather service in 2008.

Due to the demand of nowcasting of convective weather in North China(including Beijing,Tianjin,and Hebei Province),the authors use the averaged fields of NCEP 1°× 1° final analyses during May to August of 2000-2005 to analyze the climatic background of convective weather in warm season in north China.

Based on the 74 circulation characteristics from the National Climate Centre of China and NCEP/NCAR reanalysis data, the climatic background of heavy rainfall anormalies caused by the severe tropical storm ( STS ) "Bilis" is analyzed.

By using NCEP reanalysis data and observational data in station,the climatic background which may be responsible for the spring strong dust storm activities in 2006 has been investigated.