摘要
利用夏季欧亚中高纬大气环流持续流型指数的年代际变化来反映欧亚中高纬大气环流的多年振动,尝试揭示夏季欧亚中高纬持续流型的年代际变化与我国降水、全球海温以及北大西洋涛动(NAO)的年代际变化之间的联系,主要结论如下:(1)1959—2000年夏季欧亚中高纬流型指数有明显的年代际变化,1980年前后流型指数均值发生了年代际突变;(2)夏季欧亚中高纬流型指数的年代际变化特征与我国夏季降水、6月全球海表温度距平的年代际变化趋势具有一致性,印证了SSTA与夏季欧亚中高纬持续流型、持续流型与我国夏季降水之间的关联;(3)冬季NAO指数和夏季流型指数在年代际尺度上关系甚为密切,它们的年际相关也存在着年代际变化;(4)合成分析表明,NAO高指数及E型过程对应的春季SSTA分布形势极为相似,且突变前后与E、C型环流对应的海温异常的分布特征和关键区,在中期-月及年代际不同时间尺度上也表现出了一致性,印证了下垫面强迫在夏季欧亚中高纬持续流型的形成和维持中的作用。
The interdecadal variation of the persistent general circulation pattern index over Eurasian mid-high latitude in summer (hereinafter referred to as CP-index) is investigated to reflect the interdecadal variation, and try to reveal the relation of the interdecadal variation of the persistent general circulation over Eurasian mid-high latitude in summer to the rainfall in China, global sea surface temperature and North Atlantic Oscillation (NAO). The main conclusions are as follows: (1) From 1959 to 2000, the summertime circulation over Eurasian mid-high latitude experience obvious interdecadal variation, while the index value a shift of the average index around 1980. (2) The trend of interdecadal variation of the CP-index is consistent with that of the rainfall in China, global sea surface temperature anomaly. (3) The NAO index (in winter) and the CP-index (in summer) show a similar trend for interannual and interdecadal variation. Highly statistic significant positive correlativity exists between the two index under interdeeadal time-scale. (4) The sea surface temperature in spring corresponding to NAO high-value index is similar to that corresponding to general circulation pattern E, which verifying the underlying surface forcing play main role in the formation and persistence of persistent general circulation pattern over Eurasian mid-high latitude in summertime.
出处
《海洋预报》
2016年第6期57-68,共12页
Marine Forecasts
基金
"十二五"国家科技支撑计划(2012BAC19B10)
关键词
夏季欧亚中高纬
持续异常
年代际变化
降水
海温
北大西洋涛动
Eurasian mid-high latitude in summer
persistent anomaly
decadal variation
rainfall
sea surface temperature
NAO