湖北永兴洞降水对2015年厄尔尼诺的响应  

The response of precipitation δ^18O in Yongxing Cave,Hubei Province to ENSO,2015

作　　者：王权 赵侃[3,4,5] 杨少华 梁怡佳 张敬伟[3,4,5] 崔英方 汪永进 Wang Quan;Zhao Kan;Yang Shaohua;Liang Yijia;Zhang Jingwei;Cui Yingfang;Wang Yongjin(Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area,School of Geography and Tourism,Chongqing Normal University,Chongqing 401331;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,Shaanxi;School of Geography,Nanjing Normal University,Nanjing 210023,Jiangsu;Key Laboratory of Virtual Geographic Environment(Nanjing Normal University),Ministry of Education,Nanjing 210023,Jiangsu;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,Jiangsu;Nanjing Institute of Tourism&Hospitality,Nanjing 211100,Jiangsu)

机构地区：[1]重庆师范大学地理与旅游学院,三峡库区地表过程与环境遥感重庆市重点实验室,重庆401331 [2]中国科学院地球环境研究所,黄土与第四纪地质国家重点实验室,陕西西安710061 [3]南京师范大学地理科学学院,江苏南京210023 [4]虚拟地理环境教育部重点实验室(南京师范大学),江苏南京210023 [5]江苏省地理信息资源开发与利用协同创新中心,江苏南京210023 [6]南京旅游职业学院,江苏南京211100

出　　处：《第四纪研究》2020年第4期985-991,共7页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:41572151和41702180);重庆市教育委员会科学技术研究项目(批准号:KJQN201900536);中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目(批准号:SKLLQG1922);重庆师范大学基金项目(批准号:19XLB010)共同资助。

摘　　要：通过对湖北永兴洞为期3年(2013年6月至2016年7月)的地表降水δ^18O观测,发现该地点降水δ^18O在2015夏季显著偏正.利用HYSPLIT后向轨迹方法对永兴洞降水水汽来源进行分析,结果表明在厄尔尼诺事件的影响下2015年夏季来自远源印度洋的水汽显著减少,而近源太平洋水汽相对增多,即降水 δ^18O因"环流效应"而偏正.本研究提供的观测证据表明永兴洞石笋 δ^18O记录在重建ENSO主导下的亚洲季风大气环流方面具有重要潜力.Yongxing Cave(31°35'N,111°14'E;800 m above sea level)is located in Hubei Province,Central China.The area is strongly influenced by the subtropical monsoon climate,and current meteorological conditions are dominated by distinct seasonal changes of temperature and precipitation.According to recent research,the stalagmiteδ^18O record in Yongxing Cave shows significant ENSO signals.To verify the relationship between the stalagmiteδ^18O record in Yongxing Cave and ENSO,precipitationδ^18O in Yongxing Cave was monitored monthly from June 2013 to July 2016,and it is found that the precipitationδ^18O was more positive from May to September 2015.The HYSPLIT backward trajectory method was used to analyze the water vapor source of precipitation in Yongxing Cave.The results showed that under the influence of El Niño event,the water vapor from the Indian Ocean decreased significantly from May to September 2015,while the water vapor from the West Pacific Ocean,which is near Monsoonal China,increased relatively.Therefore,interannual variability of precipitationδ^18O in Yongxing Cave is mainly controlled by Chinese monsoon"circulation effect",which reflects the Indian/Pacific Ocean circulation.Evidence provided here indicates that the stalagmiteδ^18O records in Yongxing Cave have the potential to provide information on atmospheric circulation linked with ENSO in the Asian monsoon region.

关 键 词：ENSO 降水δ^18O 环流效应 永兴洞 石笋 

分 类 号：P597.2[天文地球—地球化学] P532[天文地球—地质学]