Climatic signal of ice melt features in southern Greenland
Climatic signal of ice melt features in southern Greenland
复制标题
格陵兰岛南部冰雪融化特征的气候信号
作者：
M. Herron;S. Herron;C. Langway
中深度极地冰芯融化特征的地层学记录为过去夏季气候提供了有价值的资料1 -3。以前的研究中使用的热钻技术排除了将这一记录延长到几百年以上的可能性。然而，最近在格陵兰岛南部机械钻取了一个901米深的冰芯。卓越的岩心质量和测量熔融特征的改进技术，使2000年的记录具有始终如一的高质量数据。我们在这里报告说，融化特征丰度的时间变化，表示为年度融化百分比（AMP），提供夏季气候的替代数据，可以补充其他记录延伸到几千年前。AMP剖面表明，从公元950年到公元1500年，相对温暖的夏季盛行，在十三世纪和十四世纪达到顶峰。大约在公元前300年至150年、公元350年至550年和公元1550年至1800年期间，夏季融化相对较少。
The stratigraphie record of melt features in intermediate depth polar ice cores has provided valuable data on past summer climate1–3. The thermal drilling technique used in previous studies precluded extending this record beyond a few hundred years. Recently, however, a 901-m deep ice core was mechanically drilled in southern Greenland. The excellent core quality and improved techniques for measuring melt features have resulted in an ∼2,200 yr record with consistently high quality data. We report here that the temporal variations in melt feature abundance, expressed as annual melt per cent (AMP), provide proxy data on summer climate that can complement other records extending back thousands of years. The AMP profile indicates that relatively warm summers prevailed from about AD 950 until AD 1500 culminating in the thirteenth and fourteenth centuries. The periods from about 300 to 150 BC, AD 350 to 550, and AD 1550 to 1800 had relatively little summer melting.