Analysis of the Temperature Variations and It's Reason in Sichuan and Chongqing

Analysis of the Temperature Variations and It's Reason in Sichuan and Chongqing
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川渝地区气温变化及其原因分析

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发表时间：
2008
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通讯作者：
Chen Bingyan
Chen Bingyan
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作者：
Chen Bingyan

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根据1957—2006年四川省47个站和重庆市34个站的逐日气温资料以及Nio3地区的海表温度(SST)资料,采用线性方法和小波技术,分析了近50年来四川省和重庆市气温变化的长期趋势和时频结构特征,并得出了气温变化的相关性。并采用交叉小波变换方法对川渝地区海表温度和Nio3地区海温进行了分析。结果表明,川渝地区气温变化具有多尺度、多重特征,具有2～4、8、12～16和28年的周期性波动,其中以4年周期最为明显。从年代际变化来看,1950年代末和1960年代初四川气温变化相对较明显。重庆市20世纪50年代末至1960年代末气温偏高，1960年代初至90年代末相对较低，1990年代末以来气温上升强度明显加大。重庆市气温变化与四川省大体相似，但差异较小。例如，1950年代末至1960年代末重庆气温偏暖，1970年代以后气温变化与四川省基本相同。气温变化的相关性川渝地区海温和Nio3地区海温在4年尺度上为正值，在13年尺度上为负值。川渝地区气温变化的原因有：一是中东赤道太平洋海温高（低）异常导致该地区气温高（低）；二是南亚高压的异常变化对四川盆地夏季气温变化有极其重要的影响；三是西太平洋海温变化。海洋通过副热带环流系统的影响，也是四川盆地气温变化的重要原因之一。
According to the day-to-day air temperature data of 47 stations in Sichuan Province and 34 stations in Chongqing city during 1957 to 2006,as well as the Sea Surface Temperature(SST) data in Nio3 area,by means of linear methods and wavelet techniques,an analysis was conducted on the characteristics of the long-term tendency and time-frequency structure of the air temperature variation in Sichuan Province and Chongqing city during the last 50 years.And then the correlations between air temperature variation in Sichuan and Chongqing and the SST in Nio3 area were analyzed also using the cross wavelet transform method.The results show that there are multi-scale and multifold feature and periodic fluctuations of 2～4,8,12～16 and 28 years for the air temperature variation in Sichuan and Chongqing,Especially the period of 4-year is most obvious.With respect to interdecade variations,the air temperature in Sichuan in late 1950s and early 1960s was relatively high,the early 1960s to late 1990s was relatively low,and the intensity of increased air temperature was significantly greater since late 1990s.The variations of air temperature in Chongqing city were largely similar as in Sichuan province but with minor differences.For example,the air temperature in Chongqing in late 1950s to late 1960s was warmer,the air temperature variation after 1970s was the basically same as in Sichuan Province.The correlations between the variation of air temperature in Sichuan and Chongqing and the SST in Nio3 area are positive at the 4-year scale and negative at 13-year scale.The reasons of air temperature variation in Sichuan province and Chongqing city are,firstly,the high(low) SST anomaly in Middle East equatorial Pacific will cause the high(low) air temperature in the area;moreover,the abnormal changes of South Asia high pressure were extremely important impact on air temperature variation in summer in the Sichuan Basin;and the SST of Western Pacific ocean,through the influence of sub-tropical circulation system,was also one of the important reasons for the air temperature variation in Sichuan Basin.