摘要
通过对甘肃临夏松鸣岩地区紫果云杉树轮宽度的分析,发现研究区树轮标准宽度年表与降水、PDSI相关低,而与当地3～10月平均最高温（3月至10月月平均最高温的算术平均值）相关最高（r=0.578,p＜0.0001,n=62）.在此基础上,利用多元回归技术设计转换方程,重建了研究区1818年以来3～10月平均最高温,重建序列的方差解释量达40％（调整自由度后为38％）.重建序列中高温年与低温年的年份大致相当,分别为14.9％和12.9％;重建时段可以分为4个温暖期（1818～1854年、1882～1900年、1937～ 1966年和2001～2012年）和3个寒冷期（1855～1881年、1901～1936年和1967～2000年）,可与秦岭西部的温度重建结果进行良好的对比;研究区在20世纪后期（2001～2012年平均最高温比1970～1980年平均最高温）有明显的升温趋势,上升0.77℃.空间分析表明,临夏地区3～10月平均最高气温变化具有一定的空间代表性,可以反映黄土高原西部地区气温的历史变化.功率谱分析（MTM）检测出该重建序列在过去195年中存在42.74a,7.79～3.18a和2.77a的准周期震荡,可能与PDO和ENSO大尺度海洋耦合作用有关.
Global warming was widely accepted in the 20th century,but there were diversities in different region.This paper analyzed the background of the regional response to global change in the Linxia region of the west of the Loess Plateau by tree ring.Sampling points is located in the Songmingyan National Forest Park in Linxia City,Gansu Province,and it belongs to the northern piedmont of Linxia Taizi Mountain （35.24°N,103.40°E）.According to the growth conditions of the trees,39 tree cores from 21 different trees were collected,and recorded as SMY.This sampling point＇s altitude is from 2551m to 2638m,which is located below the Picea purpurea＇s tree line.Based on the tree ring width analysis of Picea purpurea Mast.in Linxia region,Gansu Province,we found that tree-ring width chronologies had a low correlation with precipitation and PDSI,but had the highest correlation with 3～10 monthly mean maximum temperature （r =0.578,p＜0.0001,n =62） in this study,which the meteorological data was from Linxia Meteorological Station （35°35′N,103°11′E; a.s.l.=1918.5m,1951 ～ 2012A.D.）.Based upon the correlation analysis,the mean maximum temperature from March to October was reconstructed using STD chronology.The transfer function saw text.We reconstructed the mean maximum temperature from March to October of 1818～2011 A.D.using tree-ring width index in study region.The explained variance reached 40％,and 38％ after adjusting degree of the freedom.The reconstruction displayed the fluctuation of temperature in this region.The years of high temperature and low temperature in reconstruction sequence are roughly same,respectively 14.9％ and 12.9％.After an 11-year moving average,the reconstruction showed that cold and warm intervals appear alternatively in decadal scale.This presents four warm periods （1818～ 1854A.D.,1882～ 1900A.D.,1937 ～ 1966A.D.and 2001 ～2012A.D.）,with temperatures lower than the mean; and three cold periods （1855～ 1881A.D.,1901 ～ 1936A.D.,and 1967～ 2000A.D.）,with te
出处
《第四纪研究》
CAS
CSCD
北大核心
2014年第6期1270-1279,共10页
Quaternary Sciences
基金
国家重点基础研究发展规划项目(973项目)(批准号:2013CB955900)
中国科学院方向性重点项目(批准号KZZD-EW-TZ-03)共同资助
关键词
临夏
紫果云杉
树轮宽度
温度重建
Linxia
Picea purpurea Mast.
tree-ring width
temperature reconstruction
