In terms of the NCEP/NCAR daily reanalysis data,an index based on the vorticity value in the key area is defined to describe the longitudinal position of the western Pacific subtropical high(SH).

• 采用NCEP/NCAR再分析逐日资料,根据特定区域涡度值,定义描述西太平洋副高东西位置的指标,并利用该指标研究了6月副高东西位置变动特征。