摘要
本文利用1979~2015年ERA-interim逐日再分析资料,对比分析了格陵兰阻高(GB)、大西洋-欧洲阻高(AEB)、乌拉尔山阻高(UB)和北太平洋阻高(NPB)四个阻高系统对年际尺度和天气尺度地面温度及极端冷日的单独和协同影响。结果表明,各阻高与地面温度之间的统计关系十分复杂,同一阻高系统可影响多个地区的温度异常,同一个地区的地面温度一般可受到多个阻高系统的不同影响。通过分离单阻高和多阻高(双阻高、三阻高和四阻高)组合的情形,本文的结果进一步表明,UB对欧亚大陆地面温度的影响最为重要,其次对于欧洲地面温度而言,依次为AEB、GB和NPB;对于亚洲地面温度而言,依次则为GB、NPB和AEB。而NPB对北美大陆温度的影响最为重要,其次为GB和AEB,UB的影响最弱。此外,多阻高协同影响地面温度时,并非线性叠加,而是表现为显著的非线性特征。
Based on 1979-2015 ERA-interim daily reanalysis data, this paper analyzes the independent and coordinative effects of four blocking systems(the Greenland blocking, GB;the Atlantic-Europe blocking, AEB;the Ural blocking,UB;the North Pacific blocking, NPB) on surface air temperature(SAT) and extreme cold days on interannual and synoptic scales. The results show that the statistical relationship between the blocking systems and SAT is very complicated. The same blocking system can affect SAT anomalies in many areas. Meanwhile, the SAT in the same area is generally affected by many blocking systems. By separating a single blocking from multiple blockings(double blockings,three blockings and four blockings), it is further demonstrated that the influence of UB on Eurasia SAT is the most important. However, the blocking systems that have secondary impacts on SAT over Europe and Asia are different. AEB,GB and NPB rank next for Europe while GB, NPB and AEB rank next for Asia in order of importance. The blocking system that has the most important influence on the SAT over the North American is NPB, followed by GB and AEB, and the effect of UB is the weakest. In addition, the coordinative effects of multiple blocking systems on SAT are significantly nonlinear instead of a linear superposition.
作者
李亚飞
任荣彩
LI Yafei;REN Rongcai(State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science&Technology,Nanjing 210044;University of Chinese Academy of Sciences,Beijing 100049)
出处
《大气科学》
CSCD
北大核心
2019年第6期1313-1328,共16页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金项目41575041
41430533
91837311
中国科学院先导专项项目XDA17010105
中国科学院前沿项目QYZDY-SSW-DQC018~~
关键词
阻塞高压
地面温度
极端冷日
协同影响
Blocking systems
Surface air temperature
Extreme cold days
Coordinative effects
