From the Cover: Antarctic climate signature in the Greenland ice core record.
From the Cover: Antarctic climate signature in the Greenland ice core record.
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DOI：
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发表时间：
2007
影响因子：
11.1
通讯作者：
S. Barker;G. Knorr
中科院分区：
文献类型：
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作者：
S. Barker;G. Knorr
数值算法应用于格陵兰冰盖项目2（GISP 2）从格陵兰岛的尘埃记录，以消除与末次冰期的Dansgaard-Oeschger（D-O）振荡的尘埃通量的突变。该程序是基于这样一个假设，即尘埃的快速变化与大气传输的大规模变化有关，这意味着D-O振荡（就其大气印记而言）在形式上比从格陵兰温度记录中推断的更为对称。在去除突变后的剩余，dejumped灰尘记录被发现与南极气候变率的时间滞后几百年。有人认为，这种变化可能反映了格陵兰岛灰尘来源地区（被认为是东亚的沙漠）的变化。来自该地区和全球范围内的其他记录也揭示了舌式变异，并表明这种信号在全球范围内普遍存在。这为提出逐渐变化在触发气候系统更突然的转变方面发挥更重要的作用提供了潜在的基础。
A numerical algorithm is applied to the Greenland Ice Sheet Project 2 (GISP2) dust record from Greenland to remove the abrupt changes in dust flux associated with the Dansgaard-Oeschger (D-O) oscillations of the last glacial period. The procedure is based on the assumption that the rapid changes in dust are associated with large-scale changes in atmospheric transport and implies that D-O oscillations (in terms of their atmospheric imprint) are more symmetric in form than can be inferred from Greenland temperature records. After removal of the abrupt shifts the residual, dejumped dust record is found to match Antarctic climate variability with a temporal lag of several hundred years. It is argued that such variability may reflect changes in the source region of Greenland dust (thought to be the deserts of eastern Asia). Other records from this region and more globally also reveal Antarctic-style variability and suggest that this signal is globally pervasive. This provides the potential basis for suggesting a more important role for gradual changes in triggering more abrupt transitions in the climate system.