黄土高原积温变化的敏感性研究  

Sensitivity of total temperature change in China loess plateau

作　　者：王锡稳[1] 王毅荣 

机构地区：[1]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室 [2]兰州区域气候中心,甘肃兰州730020

出　　处：《干旱区地理》2006年第6期817-822,共6页Arid Land Geography

基　　金：科技部社会公益研究专项(2004DIB5J196);干旱气象科学研究基金项目(IAM200508);甘肃省科学技术攻关计划项目(ZGS042-A44-017)共同资助

摘　　要：利用54 a(1951-2004年)逐日气温等资料,研究黄土高原活动积温(≥0℃、≥5℃、≥10℃、≥15℃、≥20℃)的变化。结果表明:黄土高原积温及其持续日期变化的敏感区不仅相同;积温及其持续日期存在突变式增加,区域分布中东部较快、西部较慢,在敏感区域增加最突出;积温及持续日数的增加主要体现在积温结束日期明显推迟;降水与积温在突变(1980年)后,反向配置更为突出,积温偏高时往往降水偏少,反之亦然。In this paper, the change of accumulated temperatures ≥ 0℃, ≥5℃, ≥10℃,≥15℃,≥20℃ and 0 -20℃ over the Loess Plateau in China during the period of 1951 -2004 is lucubrated using EOF, wavelet analysis and smoothed t -text. The results are follows： （1） The accumulated temperatures ≥ 0℃, ≥5℃, ≥10℃, ≥ 15℃, ≥20℃ and 0 -20℃ and their durations over the Loess Plateau increase from the north to the south, the regional differences in the accumulated temperatures and their durations are significantly related to the elevation; the change of the accumulated temperatures and their durations is significantly linear; the change of the accumulated temperatures is sensitive in the hinterland of the plateau, especially in the Yan＇an Region; the change of accumulated temperature durations is sensitive in the central and northern parts of the plateau; （2） The accumulated temperatures ≥0℃,≥5℃,≥10℃ and ≥20℃ were sharply increased in 1986; the accumulated temperature durations were significantly prolonged in 1984; the precipitation has been reduced since 1984; the starting date of the accumulated temperature ≥ 0℃ became earlier around 1984; （3） The increase extents of the accumulated temperatures and their durations are high in the central part of the plateau but low in the marginal zone; （4） Precipitation is increased when the accumulated temoerature is high but decreased when the accumulated temperature is low.

关 键 词：黄土高原 积温及持续时间 区域变化 敏感性 

分 类 号：P461.3[天文地球—大气科学及气象学]