Investigating the past and recent δ18O-accumulation relationship seen in Greenland ice cores
Investigating the past and recent δ18O-accumulation relationship seen in Greenland ice cores
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DOI：
10.5194/cp-8-2053-2012
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发表时间：
2012-01-01
影响因子：
4.3
通讯作者：
Dahl-Jensen, D.
中科院分区：
文献类型：
--
作者：
Buchardt, S. L.;Clausen, H. B.;Dahl-Jensen, D.
十年平均值的三角洲O-18和积累率从52个冰芯位置在格陵兰岛。累积率是从三角洲O-18曲线中确定的年度层得出的。对整个冰分水岭的三角洲O-18积累关系的调查显示，在格陵兰南部分水岭的背风侧，三角洲O-18和积累率的关系具有显著的焚风效应，而在格陵兰中部没有看到这种效应。此外，积累率对温度变化的敏感性被认为是较小的北方格陵兰岛比在中部和南部地区。数据集中的四个记录包含了足够的近期数据，可以对1990年代及以后观测到的温度上升期进行调查。所有四个记录都来自格陵兰岛北方冰分水岭附近的地点，虽然其中三个记录显示温度升高，但无法从这些数据中得出关于积累率的结论。
Decadal means of delta O-18 and accumulation rates from 52 ice core locations in Greenland are presented. The accumulation rates are derived from annual layers determined in the delta O-18 curve. Investigation of the delta O-18-accumulation relationship across the ice divide reveals a significant Foehn effect with anticorrelation of delta O-18 and accumulation rate on the lee side of the divide in Southern Greenland, while no effect is seen in Central Greenland. Furthermore, the sensitivity of accumulation rate to changes in temperature is found to be smaller in Northern Greenland than in the central and southern parts. Four records in the data set contain sufficient recent data that the period of observed temperature rise from the 1990s and onwards can be investigated. All four records are from locations close to the ice divide in Northern Greenland and while three of them show increased temperatures, no conclusive statement can be made about the accumulation rate from these data.