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《Journal of Glaciology and Geocryology》 2003-03
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Comparison of Two Ice Core Records Since 1954 from Mt.Qomolangma (Everest) Region

HOU Shu-gui 1 , ZHANG Dong-qi 1, 2 (1.Key Laboratory of Ice Core and Cold Regions Environment, CAREERI, CAS, Lanzhou Gansu 730000, China; 2.Chinese Academy of Meteorological Sciences, Beijing 100081,China)  
A 41-mice core was recovered from the Far East Rongbuk Glacier (FER), and another 80\^4-m core from the East Rongbuk Glacier (ER), Mount Qomolangma (Everest) region. Both of the cores are dated by the reference layers of \% β \% activity peaks correlated to known nuclear fallout events and the seasonal variations of the \{δ 18 O\} and the major ions. The two cores have roughly the same trends in \{δ 18 O\} and net-accumulation since 1954, which indicate the same climate controlling in this region. Although the average net-accumulation rate at the FER core site is less than half of the corresponding value at the ER core site owing to the difference in location and melting condition, both of the net-accumulation records of the ER core and the FER core show clearly a sharp decline from the middle 1950s to the late 1960s, which might reflect the sudden climate change in the Asian monsoon region during that period. It is likely that the increase in atmospheric sulphate aerosol has already begun to affect the monsoon in the Himalayas, offsetting the increasing trend in monsoon precipitation that would have been caused by the increase in atmospheric greenhouse-gases. Though similar smoothing trend is apparent for the \{δ 18 O\} profiles of the two cores, the mean \{δ 18 O\} of the FER core is 3\^12 less than that of the ER core for the period 1954\_1996. This phenomenon needs much more study. Moreover, much difference exists for the mayor ionic profiles and their corresponding cumulative fluxes of the two cores. core. Since the two ice cores drilling sites are only several kilometers apart and at the same altitude, the apparent difference between the chemical records of the two cores should be attributed to the post-depositional modification.
【Fund】: 中国科学院知识创新工程重大项目(KZCX11002 KZCX210 8 KZCX2301) ;; 国家重点基础研究发展规划项目(G19990 43 40 0 );; 国家自然科学基金项目(4 990 10 0 4 40 2 0 5 0 0 7)资助
【CateGory Index】: P343.6
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