高级检索
贾建颖, 孙照渤, 刘向文, etal. 中国东部夏季降水准两年周期振荡的长期演变?[J]. 大气科学, 2009, 33(2): 397-407. DOI: 10.3878/j.issn.1006-9895.2009.02.17
引用本文: 贾建颖, 孙照渤, 刘向文, etal. 中国东部夏季降水准两年周期振荡的长期演变?[J]. 大气科学, 2009, 33(2): 397-407. DOI: 10.3878/j.issn.1006-9895.2009.02.17
JIA Jianying, SUN Zhaobo, LIU Xiangwen, . Evolution of Summer Precipitation Quasi-Biennial Oscillation in Eastern China[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(2): 397-407. DOI: 10.3878/j.issn.1006-9895.2009.02.17
Citation: JIA Jianying, SUN Zhaobo, LIU Xiangwen, . Evolution of Summer Precipitation Quasi-Biennial Oscillation in Eastern China[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(2): 397-407. DOI: 10.3878/j.issn.1006-9895.2009.02.17

中国东部夏季降水准两年周期振荡的长期演变?

Evolution of Summer Precipitation Quasi-Biennial Oscillation in Eastern China

  • 摘要: 采用中国气象局整编的中国160站月降水量资料 (1951年1月~2005年12月), 研究了中国东部地区夏季降水准两年周期振荡 (TBO) 的长期演变特征。最大熵谱分析和相对最大熵谱分析表明, 中国东部地区夏季降水TBO信号显著, 高值区基本呈带状分布, 方差最大值中心分布在江淮流域及南部沿海地区。根据中国东部夏季降水TBO分量的旋转经验正交函数展开 (REOF), 将东部地区划分为东北地区、 河套地区、 淮河流域、 长江流域、 华南西部、 华南中部及华南东部7个降水区。对各降水区的研究结果表明: (1) 东部夏季降水振幅变化TBO信号明显; (2) 各降水区夏季降水TBO有着不同的长期演变特征, 表现出不同的年代际变化。淮河流域、 长江流域和华南中部降水TBO特征较明显; 华南西部和东北地区降水TBO特征较弱; 河套地区在1990年代以前表现有较显著的TBO特征, 但1990年代后, TBO特征趋于不明显; 华南东部地区在1970年代中期以前TBO特征明显, 以后TBO特征减弱; (3) 淮河流域是中国东部地区由南向北的过渡带, 是夏季降水TBO的敏感地区。

     

    Abstract: The evolution of summer rainfall quasi-biennial oscillation (TBO) is studied over eastern China using monthly mean rainfall data of China 160 stations from China Meteorological Administration. The maximum entropy spectral analysis and the relative maximum entropy spectral analysis denote that the summer rainfall in eastern China has a marked TBO signal, the areas with high values distribute basically like a belt, and the variance maximum value centers are located in the Yangtze-Huaihe valley and the south littoral. Based on Rotated EOF analysis (REOF) of summer rainfall TBO, eastern China is divided into 7 sections including Northeast China, the Hetao basin, the Huaihe River basin, the Yangtze River basin, western South China, centre South China and eastern South China. The further study shows: (1) the eastern China summer rainfall amplitude possesses TBO features. (2) The summer rainfall TAO has different evolutions and interdecadal features for different sections. TBO is distinct in the Huaihe River basin, the Yangtze River basin and central South China; the TBO signal is weak in western South China and Northeast China; TBO was marked in the Hetao basin before the 1990s, but after the 1990s TBO weakened gradually; TBO was remarkable in eastern South China before the 1970s and it weakened after the 1970s. (3) The Huaihe River basin is the transition zone from south to north over eastern China, and is also the sensitive area to summer rainfall TBO in eastern China.

     

/

返回文章
返回