树轮记录的黄河源区1505～2013年5～9月相对湿度变化  

TREE-RING BASED MAY-SEPTEMBER RELATIVE HUMIDITY RECONSTRUCTION DURING 1505~2013 IN THE YELLOW RIVER SOURCE REGION

作　　者：黄小梅[1,2] 肖丁木[1,2,3] 秦宁生[4] 

机构地区：[1]中国气象局成都高原气象研究所/高原与盆地暴雨旱涝灾害四川省重点实验室,成都610072 [2]高原大气与环境四川省重点实验室,成都610072 [3]四川省气象台,成都610072 [4]四川省气候中心,成都610072

出　　处：《第四纪研究》2017年第3期442-451,共10页Quaternary Sciences

基　　金：高原大气与环境四川省重点实验室开放课题资助项目（批准号：PAEKL-2017-C2）、中国沙漠气象科学研究基金项目（批准号：Sqj2016002）和国家自然科学基金项目（批准号：41375116和41405077）共同资助

摘　　要：根据采集自青海省玛沁县雪山乡的祁连圆柏建立树轮宽度年表。通过相关分析发现，树轮宽度标准化年表（STD）与黄河源区内4个气象站平均5～9月相对湿度存在显著的正相关关系，相关系数达到0.60（建模期为1969～2013年）。利用标准化年表重建了黄河源区过去509年的5～9月平均相对湿度变化序列，重建方程方差解释量达36.0%，且方程稳定可靠。重建序列在过去509年先后经历了6个湿润阶段和8个干旱阶段：湿润阶段为1655～1697年、1746～1793年、1795～1816年、1898～1916年、1933～1957年和1962～1992年；干旱阶段为1530～1541年、1544～1586年、1590～1634年、1728～1745年、1817～1836年、1856～1886年、1917～1932年和1993～2004年。利用多窗谱分析（MTM）表明，重建序列具有85～256a、3.0～3.6a和2.0～2.8a左右的显著周期变化。通过对比发现，此次重建序列与黄河源区附近及青藏高原东北部其他一些能反映干湿状况的树轮重建序列在低频上具有较好的一致性。The source region of the Yellow River is in the northeastern area of Tibetan Plateau（32°30＇～36°12＇N, 95°50＇～103°30＇E）. This area is arid with a plateau-continental climate, which is in drought throughout the year. Its climate is affected by the plateau monsoon. This important region of the Tibetan Plateau has experienced changes in geographic environment and climatic conditions. These changes play a significant role in the Tibetan Plateau climate change, and will lead to problems in the social and economic development of Northwest and North China. It is important to develop new tree-ring chronologies in this region, in order to recognize climatic variation in the past. Tree-ring width chronology was created by Sabina przewalskii Kom. which collected in Xueshan Township of Maqên County of Qinghai Province（XS：34°77.293＇N, 99°67.817＇E; 3780～3811m）. In total, 51 cores/26 trees were collected. All samples were surfaced, cross-dated and measured according to standard dendrochronology techniques. Three types of tree-ring width index chronologies were created：Standard （STD）, Residual （RES） and ARSTAN （ARS） chronologies. The STD chronology, which preserves more growth features, was applied in this study. Correlation analysis indicates that there is significantly positive correlation between tree-ring width standardized chronology（STD）and the average relative humidity of four meteorological stations（May-September）in the source region of Yellow River（r=0.61969～2013）. Based on the analyses, the relative humidity sequence in May-September of Yellow River source region during 1505～2013 was reconstructed. The reconstructed equation was stable and reliable and its explain variance reached 36.0%. In the past 509 years, there were 6 wet periods（1655～16971746～17931795～18161898～19161933～1957 and 1962～1992）and 8 dry periods（1530～15411544～15861590～16341728～17451817～18361856～18861917～1932 and 1993～2004）. The longest wet period is 1746�

关 键 词：黄河源区 树轮标准化年表 相对湿度 重建 

分 类 号：P468.023[天文地球—大气科学及气象学] P534.632