宁夏热量资源气候变化的EOF特征  

EOF Characteristics of Thermal Resource Variation over Ningxia

作　　者：桑建人[1] 刘玉兰 韩世涛 邱旺[1] 

机构地区：[1]宁夏气象防灾减灾重点实验室,银川750002 [2]银川市气象局,银川750002

出　　处：《气象科技》2007年第2期187-190,共4页Meteorological Science and Technology

基　　金：科技部项目"宁夏气候对全球气候变化的响应及其机制"(2004DIB3J121)资助

摘　　要：对宁夏20个测站1961-2004年大于等于0℃、5℃、10℃积温的EOF分析表明,随着全球气候变暖,宁夏积温增加,生长季延长。大于等于0℃、5℃积温的时空变化基本一致,1997-2004年表现为连续偏多的趋势。20世纪80年代中期以前,大于等于0℃积温偏少,之后偏多。大于等于5℃积温转折时间推迟到90年代中期,之前积温偏少,之后相反。大于等于10℃积温分两种,60.1%的年份表现为整体偏多或偏少,31.6%的年份以中宁、盐池一线为分界线,南北表现为相反的趋势。生长季具有明显的年代际变化特征,生长季呈逐渐延长的趋势,每10年增加3.8天,尤其是进入21世纪以来,头4年的平均值比20世纪60年代增加14.9天。EOF analysis of accumulated temperature of 20 stations over Ningxia shows that the accumulated temperature and growth season increase with the global warming in Ningxia. The greater-than-0℃ and greaterthan-5 ℃ accumulated temperatures have a very similar variation trend： increasing from 1997 to 2004. The greater-than-0 ~C accumulated temperature is smaller before the middle 1980s and greater afterwards. The greater-than-5℃ accumulated temperature curve has a break in the middle 1990s, smaller before and greater after. The greater-than-10℃ accumulated temperature is greater or smaller than normal in the whole region in 60.1% years and has the opposite variation trend in the northern and southern parts with the boundary from Zhongning to Yanchi in 31.6 % years. The growing season shows the clear inter-decadal variation trend with an increasing rate of 3.8 days per 10 years, especially the average of the first four years of the 21st century is 14. 9 days more than that in the 1960s.

关 键 词：积温 EOF特征 生长季延长 

分 类 号：P426.613[天文地球—大气科学及气象学]