Comparison between the interannual and decadal components of the Silk Road pattern  

作　　者：HONG Xiao-Wei XUE Shu-Hang LU Ri-Yu LIU Yu-Yun 

机构地区：[1]Climate Change Research Center,Chinese Academy of Sciences [2]College of Atmospheric Science,Nanjing University of Information Science & Technology [3]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences [4]College of Earth Sciences,University of the Chinese Academy of Sciences [5]Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2018年第3期270-274,共5页大气和海洋科学快报（英文版）

基　　金：supported jointly by the National Natural Science Foundation of China[Grant numbers 41705044 and 41405053]

摘　　要：The Silk Road pattern（SRP）, which is a teleconnection pattern along the Asian upper-tropospheric westerly jet in summer, exhibits both interannual and decadal variabilities. Through the nineyear Gaussian filtering method and regression analyses, this study compares the interannual and decadal components of the SRP. The results indicate that the interannual SRP corresponds to a well-organized wave train of alternate cyclonic and anticyclonic anomalies across the Eurasian continent along the Asian westerly jet, resulting in a similar wave-like pattern of cold and warm surface temperature anomalies. This pattern of temperature anomalies differs from that associated with the original SRP, which is characterized by warmer or cooler temperatures mainly over Europe–West Asia and Northeast Asia, depending on the phase of the SRP. On the other hand, the decadal SRP shows a similar pattern to the interannual one from Europe to Central Asia, but the meridional wind anomalies tend to be weak over East Asia. These circulation anomalies are responsible for the significant temperature anomalies over Europe–West Asia and Northeast Asia but weak anomalies between these two domains.丝绸之路遥相关是夏季对流层高层沿亚洲急流波导东传的准定常波列,它能显著影响欧亚大陆的气候异常。最近的研究表明丝绸之路遥相关具有明显的年际和年代际变化分量。本文比较了这两种时间尺度的异同。结果表明:丝绸之路遥相关在年际时间尺度上对应横跨欧亚大陆上空清晰的波列状环流异常,并导致下垫面类似的波列状冷暖温度异常;而其年代际变化对应的环流异常在欧洲到中亚与年际相似,但在东亚明显减弱,而且对应的温度异常也北移到俄罗斯远东地区。我们认为年代际的这些特点可能受到其他气候要素的影响,并认为去除年代际可以更加突出丝绸之路遥相关的物理本质及其气候影响。

关 键 词：Silk Road pattern interannual variability decadal variation TEMPERATURE 

分 类 号：P461[天文地球—大气科学及气象学]