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| 南极伊利莎白公主地250年来雪芯累积、氧同位素与化学研究 | |
| 引用本文： | 张明军,李忠勤,任贾文,XIAO Cunde,QIN Dahe,KANG Jiancheng,LI Jun.南极伊利莎白公主地250年来雪芯累积、氧同位素与化学研究[J].地理学报(英文版),2006,16(1):23-33. |
| 作者姓名： | 张明军 李忠勤 任贾文 XIAO Cunde QIN Dahe KANG Jiancheng LI Jun |
| 作者单位： | 1. 西北师范大学 2. 中国科学院寒冷与干旱地区环境工程研究所 3. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China 4. Chinese Institute of Polar Research, Shanghai 200129, China 5. Antarctic Cooperation Research Center and Australian Antarctic Division, Hobart 7001, Australia |
| 基金项目： | The Key International Cooperation Project of the Ministry of Science and Technology of China, No. 2001CB711003; Knowledge Innovation Project of CAS, No.KZCX3-SW-354 |
| 摘 要： | 1Introduction In the ongoing discussion of climate change,the mass balance of Antarctica has received increasing attention during recent decades,since its reaction to global warming will strongly influence sea-level change(Schlosser and Oerter,2002).Many … |
| 关 键 词： | firn core δ18O accumulation rate glaciochemistry Antarctic ice sheet |
| 收稿时间： | 2005-10-20 |
| 修稿时间： | 2005-10-202005-11-21 |
250 years of accumulation, oxygen isotope and chemical records in a firn core from Princess Elizabeth Land, East Antarctica |
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| Mingjun Zhang Ph.D.,Zhongqin Li,Jiawen Ren,Cunde Xiao,Dahe Qin,Jiancheng Kang,Jun Li.250 years of accumulation, oxygen isotope and chemical records in a firn core from Princess Elizabeth Land, East Antarctica[J].Journal of Geographical Sciences,2006,16(1):23-33. | |
| Authors: | Mingjun Zhang PhD Zhongqin Li Jiawen Ren Cunde Xiao Dahe Qin Jiancheng Kang Jun Li |
| Institution: | (1) Geography and Environment College of Northwest Normal University, Lanzhou, 730070, China;(2) Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, 730000, China;(3) Chinese Institute of Polar Research, Shanghai, 200129, China;(4) Antarctic Cooperation Research Center and Australian Antarctic Division, Hobart, 7001, Australia |
| Abstract: | A 51.85-m firn core collected from site DT001 (accumulation rate 127 kgm-2a-1, mean annual temperature -33.1 oC) on Princess Elizabeth Land, East Antarctica, during the 1996-97 Chinese First Antarctic Inland Expedition has been analyzed for chemical composition and oxygen isotope ratio. A comparison between the seasonal variations of major ions was carried out in order to reduce the dating uncertainty, using the volcanic markers as time constrains. A deposition period of 251 years was determined. The calculated accumulation rates display an increasing trend before 1820, while after 1820, the trend of the accumulation is not obvious. Overall, temperature change in the region shows a slight increasing trend over the past 250 years. But, notably, a temperature decline of -2 oC is observed from 1860 to the present. This feature, at odds with the warming trend over the past century recorded in both hemispheres, likely reflects a regional characteristic related to the lack of a high latitude/low latitude link in the Southern Hemisphere circulation patterns. The results of the glaciochemical records of the firn core show that the mean concentrations of Cl-, Na and Mg2 are similar to those reported from other sites in East Antarctica. However, the mean concentration of Ca2 is much higher than that reported from other regions, suggesting the influence of the strong local terrestrial sources in Princess Elizabeth Land. There is no evidence of a positive correlation between NO3- concentrations and solar activity (11-year solar cycle and solar cycle length), although solar proton events may account for some of the NO3- peak values in the record. |
| Keywords: | firn core δ 18O accumulation rate glaciochemistry Antarctic ice sheet |
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