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中文摘要: 世界气象组织建议表征一个变量距平的多年平均值时段由原来的1961～1990年变为1971～2000年。因为多年平均值的改变,所表征的变量距平将不同,表现为冬季气温距平将降低,夏季降水距平在中国南方将偏少,在中国北方将偏多。这主要是因为20世纪60年代和90年代的气候态的差异所致。
中文关键词: 平均值，气候要素，SST，环流，影响
Abstract:WMO suggests that period of normals expressing the anomaly of an element variable can be changed from the old period of 1961-1990 to a new period 1971-2000.Because of the different normals,the anomaly of an element,such as the temperature,precipitation,SST and geopotential height,will be changed.The winter temperature anomaly will be 0.5℃ below in the northern part of China.The summer rainfall anomaly will be more in the Yellow River valley,the North China and Northeast China,and will be less in the Northwest China and the south of Yangtze River.It is based on the different climate state in the two periods of 1960s and 1990s.
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引用文本：
王永光,2002.多年平均值的改变对中国气候业务的影响[J].气象,28(8):41-43.
,2002.The Influences of Normals Change upon Climate Operation of China[J].Meteor Mon,28(8):41-43.
王永光,2002.多年平均值的改变对中国气候业务的影响[J].气象,28(8):41-43.
,2002.The Influences of Normals Change upon Climate Operation of China[J].Meteor Mon,28(8):41-43.