Climatic signals in multiple highly resolved stable isotope records from Greenland
Climatic signals in multiple highly resolved stable isotope records from Greenland
复制标题
DOI：
10.1016/j.quascirev.2009.11.002
复制
发表时间：
2010-02
影响因子：
4
通讯作者：
B. Vinther;P. Jones;K. Briffa;H. Clausen;K. K. Andersen-K.;D. Dahl-Jensen;S. Johnsen
中科院分区：
文献类型：
--
作者：
B. Vinther;P. Jones;K. Briffa;H. Clausen;K. K. Andersen-K.;D. Dahl-Jensen;S. Johnsen
二十冰芯钻在格陵兰冰盖的中高积累地区已被用来提取季节性解决稳定同位素记录。研究了格陵兰和冰岛的季节性稳定同位素数据与过去150-200年的气温和大气流量之间的关系。冬季的稳定同位素数据被发现的北大西洋涛动（NAO）的影响和非常密切相关的西南格陵兰岛的温度。冬季稳定同位素数据和格陵兰冬季温度的第一主成分之间的线性相关系数为0.71的季节性解决的数据和0.83的十年过滤的数据。夏季稳定同位素数据与斯蒂基斯霍尔穆尔夏季温度和北大西洋SST条件的相关性高于与格陵兰西南部温度的相关性。斯蒂基斯霍尔穆尔夏季温度和夏季稳定同位素数据的第一主成分之间的线性相关为0.56，增加到0.66的十年过滤数据。来自冰芯记录的冬季稳定同位素数据可以追溯到1400多年前，表明始于20世纪20年代的温暖时期将格陵兰岛南部的温度提高到与大约900-1300年前中世纪温暖时期最温暖时期相同的水平。这一观测结果得到了格陵兰南部冰芯钻孔温度反演的支持。格陵兰钻孔温度反演被发现对应更好地与冬季稳定同位素数据比与夏季或年度平均稳定同位素数据，它建议，一个强大的本地格陵兰温度信号，可以提取从冬季稳定同位素数据，即使在百年到千年的时间尺度。
Twenty ice cores drilled in medium to high accumulation areas of the Greenland ice sheet have been used to extract seasonally resolved stable isotope records. Relationships between the seasonal stable isotope data and Greenland and Icelandic temperatures as well as atmospheric flow are investigated for the past 150–200 years. The winter season stable isotope data are found to be influenced by the North Atlantic Oscillation (NAO) and very closely related to SW Greenland temperatures. The linear correlation between the first principal component of the winter season stable isotope data and Greenland winter temperatures is 0.71 for seasonally resolved data and 0.83 for decadally filtered data. The summer season stable isotope data display higher correlations with Stykkisholmur summer temperatures and North Atlantic SST conditions than with SW Greenland temperatures. The linear correlation between Stykkisholmur summer temperatures and the first principal component of the summer season stable isotope data is 0.56, increasing to 0.66 for decadally filtered data. Winter season stable isotope data from ice core records that reach more than 1400 years back in time suggest that the warm period that began in the 1920s raised southern Greenland temperatures to the same level as those that prevailed during the warmest intervals of the Medieval Warm Period some 900–1300 years ago. This observation is supported by a southern Greenland ice core borehole temperature inversion. As Greenland borehole temperature inversions are found to correspond better with winter stable isotope data than with summer or annual average stable isotope data it is suggested that a strong local Greenland temperature signal can be extracted from the winter stable isotope data even on centennial to millennial time scales.