为了解气候增暖情况下,无锡地区极端最高和最低气温的气候特征,用阈值检测方法对无锡市1959--2007年的日最高气温、日最低气温进行了研究,分析了极端事件的发生规律,得出主要结论:(1)从年代际看,不论是日最高气温或日最低气温,2001-2007年偏高事件最多,偏低事件最少。(2)最低气温从1980s初开始稳定上升。(3)在3、5、7、12月比较容易出现异常的气温。月内异常气温出现次数多少主要与季节更替和天气系统的转换有关。(4)日最低气温不论冬春夏秋,都是明显升高。日最高气温冬、春、秋季呈升高趋势,而夏季震荡加大。即在夏季,日最高气温偏高的事件增多,日最高气温偏低的事件也增多。
Checking Wuxi's daily high and low temperature with threshold value method, analyzing the rules of the event occurrence, several results are concluded. ( 1 ) In decade dimension, the 2 000th century has the most high-leaning events and the least low-leaning events. (2) The low temperature had been rising from the 1980. (3) Early or late seasonal change and weather system change mainly decide the number of the event. (4) In summer, the high-leaning event number of the high temperature is increasing, and the low-leaning number of it is increasing too.