CAJ | 학술논문

在综合考虑了东亚夏季风的热力和动力特征的基础上,利用湿位涡定义了一个新的东亚副热带夏季风指数,并利用1948-2007年NCEP/NCAR再分析资料分析了近60年来东亚副热带夏季风的变化特征.研究表明:该指数可以很好地反映东亚副热带夏季风的季节变动、年际变化、年代际变化等特征.另外,该指数与我国160个测站降水的相关分析表明:高指数年,夏季季风强,华北、西南内陆及华南沿海地区多雨,江淮地区少雨;反之,低指数年,夏季季风弱,华北、西南内陆及华南沿海地区偏旱,江淮流域偏涝.最后,通过与其它四种有代表性的指数的对比,发现本指数在指示江淮夏季降水方面具有明显的优势.
재종합고필료동아하계풍적열력화동력특정적기출상,이용습위와정의료일개신적동아부열대하계풍지수,병이용1948-2007년NCEP/NCAR재분석자료분석료근60년래동아부열대하계풍적변화특정.연구표명:해지수가이흔호지반영동아부열대하계풍적계절변동、년제변화、년대제변화등특정.령외,해지수여아국160개측참강수적상관분석표명:고지수년,하계계풍강,화북、서남내륙급화남연해지구다우,강회지구소우;반지,저지수년,하계계풍약,화북、서남내륙급화남연해지구편한,강회류역편로.최후,통과여기타사충유대표성적지수적대비,발현본지수재지시강회하계강수방면구유명현적우세.
Based on synthetically calculated thermodynamic and kinetic features of the summer monsoon of East Asia, this article utilizes the moist potential vorticity (MPV) to define a new index of subtropical summer monsoon for this region, and uses the NCEP/NCAR data to analyze the variation features of the subtropical summer monsoon for the past 60 years. The result shows that this new index can well reflect the seasonal, interannual, interdecadal variations and abrupt climate change of the subtropical summer monsoon. Besides, correlation analysis of this new index and the data of 160 stations in China show that, in the high index year, the summer monsoon is strong, it rains more in North China and southwestern inland and South China's coastal areas while it rains less in the areas near Changjiang River and Huaihe River; the opposite is true in the low index year. Lastly, through comparisons with the other four representative indexes, this new index has obvious advantages in denoting the summer rainfall in the areas near Changjiang River and Huaihe River.