中国冬季气温的次季节尺度振荡及其与年际异常的关系  

Sub-seasonal Scale Oscillations of Winter Temperature in China and the Relationship with Interannual Anomalies

作　　者：李文慧 谭桂容[1] LI Wenhui;TAN Guirong(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Joint International Research Laboratory of Climate and Environment Change(ILCEC),collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC‑FEMD),Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室

出　　处：《高原气象》2020年第1期110-119,共10页Plateau Meteorology

基　　金：国家重点研发计划项目(2018YFC1505804);国家自然科学基金项目(41575070,41575085,41475090)

摘　　要：利用全国756站逐日平均气温资料和旋转经验正交展开方法(REOF)、功率谱方法,分析了中国冬季气温次季节尺度振荡的基本特征,并对次季节尺度振荡引起的冬季气温年际异常进行了研究。结果表明:(1)中国冬季气温的次季节尺度振荡存在地域差异。中国南部、西部和东部地区的冬季气温次季节尺度都存在10~20天和20~60天的振荡变化,只是南部和东部地区10~20天振荡较西部更显著。(2)冬季气温的10~90,10~20和20~60天主振荡的强度具有明显的年际变化,其中西北、华中、华南地区振荡周期的年际变化相似;华北、东北地区振荡周期的年际变化相似;西南地区和云南省振荡周期的年际变化相似。(3)中国冬季气温的次季节尺度振荡与冬季气温的年际变化有密切的关系。区域主振荡强弱年对应的中国冬季气温存在明显的异常,且相应的次季节变化与冬季气温年际变化存在负相关关系。Based on the daily averaged temperature data of 756 stations in China,we analyze the basic sub-seasonal characteristics of winter temperatures in China and study the interannual anomalies of winter temperature caused by sub-seasonal oscillations,by using the Rotated Empirical Orthogonal Function(REOF) and power spectrum analysis methods.The results show that:(1) There are regional differences in the sub-seasonal oscillations of winter temperature in China.The sub-seasonal scales of winter temperatures in southern,western and eastern have 10~20 days and 20~60 days oscillations,but the 10~20 days oscillations in the southern and eastern China are more pronounced than in the western China.(2) The intensity of the main oscillations of 10~90 days,10~20 days and 20~60 days in winter has obvious interannual variations.The interannual variations of the oscillation period in the northwestern,central,and southern China are similar.The interannual variations of the oscillation period in northern and northeastern China are similar,and the interannual variations of the oscillation period in southwestern China and Yunnan province are similar.(3) The sub-seasonal oscillations of winter temperatures in China are closely related to the interannual variations of winter temperatures.There are significant winter temperature anomalies corresponding to the regional main oscillation strength year.And there is a negative correlation relationship between the low-frequency variation and the winter temperature anomalies.

关 键 词：次季节尺度振荡 年际变化 冬季气温异常 

分 类 号：P432[天文地球—大气科学及气象学]