1960-2012年西藏林芝气温和降水变化

基于1960-2012年日平均气温和日降水量数据，利用小波分析和Mann-Kendall突变分析方法，分析了西藏林芝气温和降水的变化特征。结果表明：林芝年平均气温增长速率0.028℃·a^-1；年平均气温受3~4 a尺度波动的影响，无明显主周期；年平均气温序列有3个突变点，分别是1972-1973年、1975-1976年和1977-1978年。年降水量增长率1.218 mm·a^-1；年降水量受4 a、10 a和20 a尺度波动的影响；有两个主周期，分别为2 a、19 a；年降水量序列有4个突变点，分别为1960-1961年、1965-1966年、1977-1978年、1982-1983年。

Wavelet Analysis and Mann-Kendall Test of Mean Air Temperature and Annual Precipitation in Linzhi,Tibet, China from 1960 to 2012

After making trend analysis,morlet wavelet analysis and Mann-Kendall test were used in this study for analyzing air temperature and precipitation annual variabilityfrom 1960 to 2012 in Linzhi Station,Tibet,China. It is found that there existed a increasing trend with 0.028℃·a^-1 and characteristic periods of 3-4 years for mean air temperature,but there was no obvious main period for mean air temperature,and there were three abrupt changes for mean air temperature,which were the years of 1972-1973,1975-1976 and 1977-1978.There existed a slowly increasing trend for annual precipitation with 1.1218 mm·a^-1,there also existed characteristic periods of 4 years,10 years and 20 years for annual precipitation,and there were two main periods of 2 and 10 years for precipitation,there were four abrupt changes for precipitation,which were the years of 1960-1961,1965-1966,1977-1978 and 1982-1983.