基于REOF研究辽宁省极端最高气温时空分布

选用辽宁省35个代表站1961～2005年逐日最高气温,研究极端最高气温事件的时空分布特征,采用REOF、均方差等方法,反映辽宁不同地域极端最高气温的变化和分布情况。结果表明,辽宁省年极端最高气温可分成3个区域,分别是东北部地区、西部和西北部地区、南部和东南部地区;辽宁省极端最高气温阈值分布特征与平均气温分布特征基本一致,极端最高气温阈值相对较高的地区位于西北部地区,相对较低的地区位于东南部和东部大部地区;辽宁省极端最高气温在冬季变化最大,夏季变化最小,极端最高气温日数在夏季变化最大,而春、秋、冬季变化都不大。

Analysis on the Spatial and Temporal Distribution of Extreme Maximum Temperature in Liaoning Province Based on REOF

By selecting the daily maximum temperature during 1961-2005 in 35 representative stations in Liaoning Province,the temporal and spatial distribution characteristics of extreme maximum temperature event were studied.By using REOF,the mean-square deviation and so on,the change and distribution situation of extreme maximum temperature in the different regions of Liaoning were reflected.The analysis showed that the extreme maximum temperature in Liaoning Province could be divided into 3 regions,and they were respectively in the northeast area,the west and the northwest area,the south and the southeast area.The threshold distribution characteristic of extreme maximum temperature in Liaoning Province was basically consistent with the distribution characteristic of average temperature.The zone where the extreme maximum temperature threshold was relatively high was in the northwest area of Liaoning,and the low threshold was in the southeast area and most areas of east.The change of extreme maximum temperature in winter was the greatest and the smallest in summer.The change of extreme maximum temperature days was the greatest in summer and wasn't great in spring,autumn and winter.