Greenland temperature response to climate forcing during the last deglaciation
Greenland temperature response to climate forcing during the last deglaciation
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DOI：
10.1126/science.1254961
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发表时间：
2014-09-05
期刊：
影响因子：
56.9
通讯作者：
Brook, Edward J.
中科院分区：
文献类型：
--
作者：
Buizert, Christo;Gkinis, Vasileios;Brook, Edward J.
格陵兰冰芯水同位素组成（δ O-18）提供了气候突变的详细证据，但本身不足以定量重建过去的温度及其空间格局。我们调查格陵兰岛的温度演变在最后一次冰消期使用独立的重建从三个冰芯和模拟与耦合的海洋-大气气候模式。与传统的三角洲O-18解释相反，由于二氧化碳强迫和夏季日照的增加，新仙女木时期比最老仙女木时期温暖4.5度+/- 2度C。格陵兰中部温度突变的幅度（9度至14度）大于西北部（5度至9度），这表明北大西洋起源。模拟的温度季节性变化密切跟踪大西洋翻转强度的变化，并支持气候突变主要是冬季现象的假设。
Greenland ice core water isotopic composition (delta O-18) provides detailed evidence for abrupt climate changes but is by itself insufficient for quantitative reconstruction of past temperatures and their spatial patterns. We investigate Greenland temperature evolution during the last deglaciation using independent reconstructions from three ice cores and simulations with a coupled ocean-atmosphere climate model. Contrary to the traditional delta O-18 interpretation, the Younger Dryas period was 4.5 degrees +/- 2 degrees C warmer than the Oldest Dryas, due to increased carbon dioxide forcing and summer insolation. The magnitude of abrupt temperature changes is larger in central Greenland (9 degrees to 14 degrees C) than in the northwest (5 degrees to 9 degrees C), fingerprinting a North Atlantic origin. Simulated changes in temperature seasonality closely track changes in the Atlantic overturning strength and support the hypothesis that abrupt climate change is mostly a winter phenomenon.