古里雅冰芯气候记录对ENSO事件的响应  

The Response of the Climate Records in the Guliya Ice Core to ENSO Events

作　　者：杨梅学[1] 姚檀栋[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2003年第1期27-33,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金"创新群体"项目;国家自然科学基金项目 ( 4 0 1710 2 0 );国家重点基础研究发展规划项目 (G19980 40 80 0 )资助

摘　　要：ENSO现象是一个产生于大尺度海气相互作用的全球事件 ,它是影响全球中低纬度大部分地区气候年际变化的一个重要的因子 .通过高通滤波法、累积异常法以及非参数检验等方法 ,对古里雅冰芯中所记录的气候信息与ENSO事件进行相关分析表明 ,在厄尔尼诺年 ,古里雅冰芯中记录的降水量显著减少 ,但对于δ18O而言 ,虽然也在厄尔尼诺年偏低 ,但未达到显著性水平 .El Nino-Southern Oscillation (ENSO) is a global event caused by the sea-atmosphere interaction in large scale. The period of ENSO is 2～10 a. In the lower and middle latitudes of the world, ENSO event is one of the very important factors for climate variation. Many scientists studied the impact of ENSO events on the climate in China. The studies of ENSO and precipitation variations in semi-arid regions in northern China showed that El Nino events corresponded with the deficit of precipitation in northern China and the Southern Oscillation Index (SOI) significantly correlated with precipitation variations. In this paper, based on the El Nino Chronology and other El Nino-Southern Oscillation index, using precipitation and temperature data recorded in the Guliya ice core, the response of the climate records in Guliya ice core to the ENSO events was examined.;The Guliya ice cap (35°17′ N,81°29′ E), with the elevation of {6 200}～{6 700} m, located in the West Kunlun Mountains. It was demonstrated that the glacier net accumulation in the Guliya ice cap is a good proxy index for precipitation. Thus, the net accumulation recorded in the Guliya ice core can be used as precipitation. Meanwhile, it was also showed that the δ 18O recorded in the Guliya ice core is a good proxy index for temperature.;Due to the ENSO event caused by the sea-atmosphere interaction in large scale. It occurs every 3～5 a and its spectrum width is 2～10 a. Firstly, the net accumulation and δ 18O from 1690 to 1991 recorded in the Guliya ice core was expressed by 10-year Gaussian moving average. The differences of the raw data (high-passed filtered data) and the moving average data were used as the anomaly in the following analysis. If only the anomalies from the raw data were used in analysis, the response signals of the climate records to El Nino events will be affected by the low frequency variation. So, it is necessary to use the high-passed filtered data. The high-passed filtered data can ensure that any significant relationship

关 键 词：古里雅 冰芯气候记录 ENSO事件 厄尔尼诺 年际变化 降水量 相关分析 

分 类 号：P467[天文地球—大气科学及气象学] P732