利用红柳沙包沉积纹层揭示罗布泊地区近现代的气候变化

The modern climate change revealed by the sedimentary veins of Tamarix dune in Lop Nor region

罗布泊地区红柳沙包落叶中TN、K+和Na+含量与6～8月平均气温呈正相关;δ13C、TOC含量与9～10月平均空气相对湿度呈显著负相关,K+、Ca2+、Mg2+含量与其呈显著正相关;所有气候代用指标与6～8月降水总量相关性都较差。依据选择的显著相关因子,重建了罗布泊地区近160多年来的6～8月平均气温序列,9～10月平均空气相对湿度序列。结果显示:6～8月平均气温变化经历了1841～1854年、1867～1912年、1937～1960年和1995～2005年的偏暖期以及1855～1866年、1913～1936年和1961～1994年的偏冷期;9～10月平均空气相对湿度变化经历了1841～1884年、1900～1910年和1954～1986年的偏干期以及1885～1899年、1911～1953年和1987～2005年的偏湿期。

The content of TN,K＋ and Na＋ in fallen leaves of Tamarix cones have a positive relationship with the average temperature during June to August;The values of δ13C and TOC is negatively correlated with the average air relative humidity during September to October,and the content of K＋,Ca2＋,Mg2＋ is positively correlated with it;There is a poor correlation between all the climatic proxies and the total precipitation during June to August in Lop Nor region.Based on the choosen significant correlation factors,the paper reconstructs the average temperature series from June to August,the average air relative humidity series from September to October,and divides the cold-warm and dry-wet periods.The result shows that in recent 160 years the average temperature series from June to August has experienced warmer periods in the years of 1841-1854,1867-1912,1937-1960 and 1995-2005 as well as colder periods in the years of 1855-1866,1913-1936 and 1961-1994;the average air relative humidity series from September to October has experienced drier periods in the years of 1841-1884,1900-1910 and 1954-1986 as well as wetter periods in the years of 1885-1899,1911-1953 and 1987-2005.