东南极洲Lambert冰川流域半个多世纪以来气候变化特征

The Features of the Climate Change in the Past 50 Years in the Lambert Glacier Basin, East Antarctica

通过对 1 996/ 1 997年中国首次南极内陆冰盖考察获得的东南极洲 Lambert冰川流域东侧50 m雪芯 ,顶部 1 3 m的δ1 8O资料的分析和积累率的恢复 ,首次揭示了 Lambert冰川流域东侧半个多世纪以来的气候变化特征 ,即半个多世纪以来气候变化的总趋势为气温升高、降水增加 .而Lambert冰川流域西侧雪芯资料表明 ,本地区半个多世纪以来气温变化趋势不明显 ,降水明显减少 ,说明整个 Lambert冰川流域 2 0世纪 40年代以来气候变化有明显的区域差异性 .同时研究了Lambert冰川流域东西两侧稳定同位素比率和温度的关系 .

The upper 13 meters of the 50 meter firn core drilled along the route of the 1996/1997 Chinese First Antarctic Inland Expedition in the eastern part of the Lambert Glacier Basin, East Antarctica, has been measured for δ 18 O and the rate of accumulation. The features of the climate change in the past 50 years in the studied region have been shown for the first time. In the past 50 years, the whole climate trends in the region were the warming temperature and the increasing precipitation. On the contrary, the temperature trend of the western part of the Lambert Glacier Basin was not so clear in the same period. The precipitation trend of the region was clearly decreasing, which indicates the climate changes of the whole Lambert Glacier Basin were different in the different regions. At the same time, the study of the correlation between stable isotope ratios and temperature shows that the δ temperature gradients were different between the eastern part and the western part of the Lambert Glacier Basin.