喜马拉雅山达索普冰川积累量变化及其对青藏高原温度的响应  

Precipitation Variation Recorded in a HimalayanIce Core and Its Response to Tibetan Temperature

作　　者：段克勤[1] 姚檀栋[1] 蒲健辰[1] 孙维贞[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开放研究实验室,甘肃兰州730000

出　　处：《冰川冻土》2001年第2期119-125,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金!(4980 10 0 4) ;国家重点基础研究专项! (G19980 40 80 2 ) ;中国科学院寒区旱区环境与工程研究所冰芯与寒区环

摘　　要：利用从青藏高原南部提取的达索普冰芯重建的积累量 ,研究其与印度夏季风之间的关系 ,并分析了近百年来积累量的变化趋势 .应用子波分析方法对达索普积累量及高原温度变化进行分析 ,结果表明 :积累量与高原温度变化都具有多尺度特征 ,在 10～ 2 0a尺度上 ,高原温度与达索普积累量存在显著的正相关性 .通过分析印度季风降水与高原温度之间的相互作用 ,探讨了达索普积累量对高原温度变化的响应 .A high-resolution ice core record from the Dasuopu Glacier in the Himalayasreveals that precipitation is sensitive to the fluctuation of temperature in the Tibetan Plateau. The aim of this paper is to reconstruct the precipitation in the Middle Himalayas since 1900 and to link it with the temperature variation in the Tibetan Plateau. The glacier accumulation history reconstructed from an ice core can be used to detect the response of glaciers to climate change, and to predict the possible variation of glacier mass balance and water resources. This kind of work is particularly important on the Tibetan Plateau, where direct observation is relatively scarce. In 1997 three ice cores were recovered from the Dasuopu Glacier (28°23′ N, 85°43′ E), approximately 2 km northwest of the Peak Xixabangma. The result from one core at 7 200 m a.s.l. is presented. Recovery of accumulation within the ice core requires for a time scale. Dating is based on seasonal characteristics of ions and a ice flow model. There is some uncertainty in the dating because of high accumulation, low temperature and strong seasonal variation. Based on the relationship among depth, velocity and annual layer suggested by Thompson et al., accumulation of the glacierover the last 100 years is constructed. In the past 100 years, accumulation of the glacier fluctuated like a sin wave, together with a decreasing trend. Since 1900, accumulation has decreased by 1/2, as shown in the annual and decadal averaged data. The maximum annual mean accumulation appeared between 1918 and 1928. Morlet wavelet analysis is employed to resolve the temporal structure of the variation of annual proxy precipitation. It is found that the accumulation time series displays variability for multiple time scales. No single and persistent frequency dominated. Most of the energy is located in the frequency band with period less than about 15 a, and the maximum power appears around 2～4 a and 10～15 a. In addition, the annual mean temperature in the Tibet Plate

关 键 词：达索普冰芯 青藏高原 温度 印度季风 积累量 冰川 子波分析 

分 类 号：P467[天文地球—大气科学及气象学] P343.6