青藏高原东北部边坡地带气温变化特征研究

利用青藏高原东北部边坡地带12个地面气象站1961～2000年的月平均气温资料,分析了40年来气温变化的特征及趋势.发现,青藏高原东北部边坡地带气温暖突变发生在1987年,从20世纪80年代初开始区域内最低气温明显上升,到90年代出现最高、最低气温同时上升的现象;夏季、秋季和冬季平均气温普遍呈升高趋势,冬季气温在1978年出现暖突变,升温趋势明显要大于其它季节,春季气温上升趋势不明显.最高、最低气温和气温日较差的变化具有明显的季节差异.

Variation characteristics of temperature in northeastern border region of Qinghai Xizang Plateau

Based on the monthly temperature data of 12 stations in the northeast border region of Qinghai-Xizang plateau,the variation characteristics of temperature in recent 40 years were analyzed.The results showed that the warm abrupt change of yearly mean temperature occurred in 1987,the minimum temperature increased from early of 1980s' in this region,in the 1990s' the minimum temperature still increased while the maximum temperature became increasing.The mean temperatures of summer,autumn and winter all apparently increased.The increasing speed of winter was obviously faster than other seasons,and the warm abrupt change of winter mean temperature occurred in 1978 earlier than in other years.The increasing trend of spring mean temperature was not apparently.The change of daily maximum temperature,daily minimum temperature and daily temperature was obviously different in different seasons.