东亚季风区最近1000 a石笋δ^(18)O空间变化特征及气候意义研究  

On Spatial Variation and Its Implications of Stalagmiteδ^(18)O from East Asian Monsoon Region over the past 1000a

作　　者：鄢应燃 刘睿恺 杨勋林[1] 吕春艳[1] 张日萍 张瑞 YAN Ying-ran;LIU Rui-kai;YANG Xun-lin;LÜChun-yan;ZHANG Ri-ping;ZHANG Rui(Key Laboratory of Eco-environments in Three Gorges Reservoir (Ministry of Education)/School of Geographical Sciences, Southwest China University, Chongqing 400715, China)

机构地区：[1]西南大学地理科学学院/三峡库区生态环境教育部重点实验室,重庆400715

出　　处：《西南师范大学学报（自然科学版）》2021年第4期98-104,共7页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(41971109);中央高校基本科研业务费重大项目(XDJK2012A003).

摘　　要：利用重庆市丰都水鸣洞石笋NSM03精确定年数据和δ^(18)O数据建立的高分辨率石笋记录,结合其他已经发表的亚洲季风区石笋氧同位素记录,探讨洞穴石笋δ^(18)O值过去1000 a的空间变化特征以及指示的气候环境意义.结果显示:亚洲季风区石笋δ^(18)O值过去1000 a在空间上呈现出与大气降水δ^(18)O值相似的纬度效应和海陆效应,石笋δ^(18)O值沿水汽输送路径不断衰减,逐渐变轻,表明印度洋是中国季风降水的主要水汽源区;水鸣洞NSM03石笋记录与南亚季风区瓦什卡洞的WBS石笋记录以及中国藏南波密-林芝地区的树轮记录存在明显的相关关系,也进一步地表明中国东部季风区的水汽主要来自印度洋;亚洲季风区石笋δ^(18)O记录在过去1000 a的变化趋势基本一致,但是中国东部季风区降水变化存在很大的空间差异,这表明季风区石笋δ^(18)O记录不一定都能指示当地降水量的变化;因此,中国季风区石笋δ^(18)O记录主要指示是东亚季风环流的信息,当东亚季风环流强的时候,季风区石笋氧同倍数偏轻;反之亦然.High-resolution stalagmite absolute-dated and oxygen rerocd by Shuiming Cave Stalagmite NSM03 from Fengdu has been studied in combination with other published in Asian monsoon region stalagmite oxygen isotope record,and the spatial variation and its implications of stalagmiteδ^(18)O from East Asian monsoon region over the past 1000a also been discussed.The result show that the stalagmiteδ^(18)O record change in Asian monsoon region have an obviously latitude effect and sea effect over the past 1000a,similar to atmospheric precipitation,along the water vapor transport path to decay,stalagmiteδ^(18)O become lighter;Asian monsoon region stalagmiteδ^(18)O recording trends within the past 1000a tends to be consistent;there is significant correlation between Shuiming cave NSM03 stalagmite record and the South Asian monsoon region Wah Shikar cave WBS stalagmite record and Bomi-Linzhi area tree ring records of Southern Tibet in China.The study indicated that China Eastern monsoon region water mainly from India ocean,the monsoon region China stalagmite is a record of the South Asian monsoon information,when the South Asian monsoon is strong,the East Asian monsoon region stalagmite oxygen isotope is relatively light;and vice versa.

关 键 词：石笋 氧同位素 季风环流 水鸣洞 中国东部 

分 类 号：P532[天文地球—古生物学与地层学]