长白山地区夏季旱涝时空分布规律研究

根据帕默尔旱度模式和刘巍巍等人修正的帕默尔旱度模式，以长白山地区20个气象站历年气温和降水资料建立长白山地区的旱涝指数模式，计算了能够反映长白山地区干湿变化的20个气象站1960-2005年夏季（6—8月）逐月水分距平指数，并应用经验正交函数展开方法分析了长白山地区夏季旱涝时空分布规律．结果表明：长白山地区夏季旱涝存在全区一致型、东北一西南反相型和西南、北、东部与中部反相型3种分布类型，其中全区一致干旱或一致雨涝是长白山地区夏季旱涝的最主要特征．

Study of Spatial-temporal Distribution of the Drought and Flood for Changbai Mountains Area

We uses a farther modified Meteorological Drought Severity Model to calculate summer （6-8 months） moisture anomaly index Z for Changbai mountains area which based on the Palmer Drought Severity Model and the modified Palmer Drought Severity Model corrected by Liu Weiwei etc. , and then the spatialtemporal distribution of the Z values is analyzed by empirical orthogonal funtion expansion （EOF）. The monthly temperature and precipitation data at 20 stations from Changbai moutains area （1960--2005） were used as bisic data. The results show that there are three distribution patterns of summer drought and flood in Changhai mountains area, namery all-consistent pattern, northeast-southwest reversal pattern and southwest- north-east with middle area reversal pattern. The all-consistent drought or flood is the main characteristic.