摘要
利用祁连山区周围34个测站1961-2000年历年1～12月低云量和降水量资料，采用EOF、REOF等方法，分析了40年来祁连山附近低云量的空间异常特征和时间变化规律。结果表明：EOF的前3个主成分可以较好地反映季低云量整体异常结构，即主体一致型、东西变化的“＋-＋”型、南北变化相反型。REOF的前3个载荷向量场可以较好地代表低云量的3个主要异常敏感区：柴达木盆地区、祁连山区、河西走廊区。柴达木盆地：各个季节低云量皆呈上升趋势，特别是1985年以后云量显著增加。河西走廊区：春、夏季低云量的变化趋势不显著，但20世纪90年代夏季低云量处于减少时期。祁连山区：春、秋季趋势不显著，但秋季从1991年后显著上升，夏季有显著的下降趋势。
Using the low cloud amount of 34 observational stations over Qilian mountain area from January to December in the period of 1961-2000, the spatial anomaly features and time evolution rule of low amount for 40 years were analyzed with EOF and REOF methods. The results show the first three principal components can reflect the whole anomaly structure of season low cloud amount, namely the consistent type in the whole, ＂＋-＋＂ type of east and west changes, north and south change contrary type. The first three loading vector fields of REOF can represent the three principal amount anomaly areas. Chaidainu basin, Qilian mountain area and Hexi corridor. Its turn in to have the different trends, Chaidamu basin＇s cloud amount had increased trend in each season, especially the amount of cloud notable increased after 1985. Hexi corridor＇s cloud amount trend hadn＇t obviously changed in spring and summer, but in 1990＇s the amount obviously decreased in summer. Qilian mountain area＇s trend didn＇t obviously change in spring and autumn, but the autumn＇s amount trend increased in 1990＇s and decreased in summer.
出处
《高原气象》
CSCD
北大核心
2006年第3期545-548,共4页
Plateau Meteorology
基金
国家科技攻关计划"人工增雨技术研究及示范"(2001BA610A06)
甘肃省气象局"云水资源及降水量时空分布的卫星遥感监测研究"(2001人影-1-2)资助
关键词
祁连山
低云量
气候变化
Qilian mountain, Low cloud amount
Climatic change
