High-Resolution Greenland Ice Core Data Show Abrupt Climate Change Happens in Few Years
High-Resolution Greenland Ice Core Data Show Abrupt Climate Change Happens in Few Years
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DOI：
10.1126/science.1157707
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发表时间：
2008-08
期刊：
影响因子：
56.9
通讯作者：
J. Steffensen;K. K. Andersen-K.;M. Bigler;H. Clausen;D. Dahl-Jensen;H. Fischer;K. Goto‐Azuma;M. Hansso
中科院分区：
文献类型：
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作者：
J. Steffensen;K. K. Andersen-K.;M. Bigler;H. Clausen;D. Dahl-Jensen;H. Fischer;K. Goto‐Azuma;M. Hansso
在我们目前的温暖间冰期的开始，由新仙女木冷却事件中断的最后两个突然变暖，从北格陵兰冰芯项目冰芯的高时间分辨率进行了研究。氘过量，格陵兰降水水分来源的代理，切换模式在1至3年内，这些过渡，并启动了一个更渐进的变化（超过50年）的格陵兰气温，记录稳定的水同位素。格陵兰两次突然变暖的发生都稍早于格陵兰灰尘沉积的减少，反映了亚洲沙漠的湿润。热带辐合带的北方移动可能是这些北方半球大气环流突变的触发器，导致格陵兰水汽源温度从一年到下一年的2到4开尔文的变化。
The last two abrupt warmings at the onset of our present warm interglacial period, interrupted by the Younger Dryas cooling event, were investigated at high temporal resolution from the North Greenland Ice Core Project ice core. The deuterium excess, a proxy of Greenland precipitation moisture source, switched mode within 1 to 3 years over these transitions and initiated a more gradual change (over 50 years) of the Greenland air temperature, as recorded by stable water isotopes. The onsets of both abrupt Greenland warmings were slightly preceded by decreasing Greenland dust deposition, reflecting the wetting of Asian deserts. A northern shift of the Intertropical Convergence Zone could be the trigger of these abrupt shifts of Northern Hemisphere atmospheric circulation, resulting in changes of 2 to 4 kelvin in Greenland moisture source temperature from one year to the next.