Synchronous Change of Atmospheric CO2 and Antarctic Temperature During the Last Deglacial Warming
Synchronous Change of Atmospheric CO2 and Antarctic Temperature During the Last Deglacial Warming
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DOI：
10.1126/science.1226368
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发表时间：
2013-03
期刊：
影响因子：
56.9
通讯作者：
F. Parrenin;V. Masson‐Delmotte;P. Köhler;D. Raynaud;D. Paillard;J. Schwander;C. Barbante;A. Landais-A.-Land
中科院分区：
文献类型：
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作者：
F. Parrenin;V. Masson‐Delmotte;P. Köhler;D. Raynaud;D. Paillard;J. Schwander;C. Barbante;A. Landais-A.-Land
大气CO2浓度的变化与地面气温密切相关。然而，温度既可以影响大气中的二氧化碳，也可以受到二氧化碳的影响，对极地冰芯的研究得出结论，在迅速变暖期间，温度的上升比二氧化碳的上升早几百年。Parrenin等人（第1060页;见Brook的《透视》）根据南极冰芯中N2的同位素组成，提出了一个修订的南极冰芯大气成分年龄表，并认为在最后一次冰消期，温度和CO2在四个快速变暖的时间段内同步变化。在末次冰消期，气温的升高并没有导致大气二氧化碳浓度的增加。[Also要理解大气中二氧化碳在过去气候变化中的作用，就需要清楚地了解它是如何随时间相对于温度变化的。南极冰芯保存了过去80万年来大气二氧化碳和南极温度的高分辨率记录。在这里，我们提出了一个修订的相对年龄尺度的大气CO2浓度和南极温度的最后一次冰消期变暖，使用数据从南极冰芯。我们推断的相位之间的CO2浓度和南极温度在四个时间时，他们的趋势突然改变。我们发现它们之间没有显著的相关性，这表明南极温度并没有像早期研究所建议的那样，在大气CO2浓度增加之前开始几百年就开始上升。
No Leader to Follow Changes in the concentration of atmospheric CO2 and surface air temperature are closely related. However, temperature can influence atmospheric CO2 as well as be influenced by it. Studies of polar ice cores have concluded that temperature increases during periods of rapid warming have preceded increases in CO2 by hundreds of years. Parrenin et al. (p. 1060; see the Perspective by Brook) present a revised age scale for the atmospheric component of Antarctic ice cores, based on the isotopic composition of the N2 that they contain, and suggest that temperature and CO2 changed synchronously over four intervals of rapid warming during the last deglaciation. Rising air temperature did not lead the increase of atmospheric carbon dioxide concentration during the last deglaciation. [Also see Perspective by Brook] Understanding the role of atmospheric CO2 during past climate changes requires clear knowledge of how it varies in time relative to temperature. Antarctic ice cores preserve highly resolved records of atmospheric CO2 and Antarctic temperature for the past 800,000 years. Here we propose a revised relative age scale for the concentration of atmospheric CO2 and Antarctic temperature for the last deglacial warming, using data from five Antarctic ice cores. We infer the phasing between CO2 concentration and Antarctic temperature at four times when their trends change abruptly. We find no significant asynchrony between them, indicating that Antarctic temperature did not begin to rise hundreds of years before the concentration of atmospheric CO2, as has been suggested by earlier studies.