Regional Differences in Temperature Change Characteristics and Abrupt Change Analysis for Shandong Area During 1961～2011

Based on the relevant data from 17 meteorological stations in Shandong area during the period of1961 to 2011,such as the daily average temperature,annual mean maximum temperature and annual mean minimum temperature,the methods of trend analysis,Mann-Kendall test and accumulated difference curve were used to analyze the characteristics of the variation and the abrupt change of the temperature in recent 50 years.The results indicated that the annual average temperature,annual mean maximum temperature and annual mean minimum temperature all showed warming trend in Shandong area from 1961 to 2011 and the average warming rates were 0. 22℃ /10a,0. 17℃ /10a and 0. 33℃ /10a,respectively. The increase of the annual mean minimum temperature was greater than that of the annual mean maximum temperature,which displayed that the annual minimum temperature rising made contribution to the climate warming in Shandong area. The temperature changing trend was of marked characteristic of stage rather than monotonically increasing over the last 50years. In some areas of Shandong,climate warming heavily concentrated in recent 20 years while the abrupt change of the annual average temperature,annual mean maximum temperature and annual mean minimum temperature mostly appeared from the late 1980s to the early 1990s. Generally,the climate warming of Shandong Province had remarkable regional characteristic,the related data demonstrated that the annual mean maximum temperature rising in Rizhao region was most obvious,and both the annual mean minimum temperature rising and the annual average temperature rising in Longkou region were especially evident.