Snow Accumulation in North Greenland over the Last Millennium

Snow Accumulation in North Greenland over the Last Millennium
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过去千年格陵兰岛北部的积雪

DOI:
10.1007/978-3-319-13865-7_21
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发表时间:
2015
期刊:
International Journal of Climatology
影响因子:
--
通讯作者:
S. Kipfstuhl
S. Kipfstuhl
中科院分区:
--
文献类型:
--
作者:
S. Weißbach;A. Wegner;S. Kipfstuhl

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了解极地大冰盖的积雪速率及其随时间的变化对于物质收支研究和海平面预测至关重要。在这里,我们提出了平均长期的雪积累率的12个浅冰芯钻北格陵兰导线在格陵兰岛的北方部分。冰芯记录涵盖了过去的500-1000年。结果表明,从西南方向(~180 mmWE/a)到东北方向(~95 mmWE/a),累积速率呈递减趋势。冰分水岭的地点显示出更高的积累率,但也有更高的变异性(高达20%)比冰分水岭以外的地点(不到10%)。与最近的模拟研究不同,我们的结果表明,在过去的400年里,格陵兰岛北部的积累没有变化。
Knowledge of snow accumulation rates of the large polar ice sheets and their variability over time is crucial for mass budget studies and sea level predictions. Here we present mean long-term snow accumulation rates of 12 shallow ice cores drilled by the North Greenland traverse in the northern part of Greenland. The ice core records cover the last 500–1000 years. We find a trend of decreasing accumulation rate from the southwest (~180 mmWE/a) to northeast (~95 mmWE/a). Ice divide sites show higher accumulation rates but also higher variability (up to 20 %) than sites off the ice divides (less than 10 %). Unlike a recent modeling study our results indicate no change in the accumulation in the north of Greenland during the last 400 years.