摘要
基于月降水和月平均气温资料,分析了川中丘陵区近50年降水和气温的变化特征及其与太平洋年代际振荡指数(PDO I)的关系.结果表明,川中丘陵区气候存在明显的年代际趋势和突变特征.相关分析和独立样本T检验表明,川中丘陵区夏季气温、年平均气温和秋季降水量与年PDO I均有显著的相关关系,PDO冷位相(1977年以前)对应着高温、多秋雨,而PDO暖位相(1977年以后)对应着夏季和年均温下降,秋季雨水减少.
Based on monthly precipitation and monthly mean surface air temperature （SAT）, the changes of precipitation and surface air temperature in the hill regions of Middle Sichuan during last 50 years and their relationship with the Pacific Decadal Oscillation （PDO） have been analyzed. The results indicate that there was a prominent trend and an abrupt change in the analysis period. The correlation analysis and independent-samples T test have brought about a finding of significant correlativity between PDO index （PDOI） and summer temperature, annual mean air temperature and autumn precipitation in these regions. The correlation exhibits that the negative phase of PDOI （warm PDO phase） matches warming and more autumn precipitation, and the positive PDOI phase corre- sponds to low SAT and less autumn precipitation.
出处
《西华师范大学学报（自然科学版）》
2008年第4期360-364,共5页
Journal of China West Normal University(Natural Sciences)
基金
四川省教育厅重点资助项目(2005A110)
西华师范大学基金资助项目(07A001)
关键词
太平洋年代际振荡
川中丘陵区
气候变化
Pacific Decadal Oscillation
the hill regions of Middle Sichuan
climate change
