Continental-scale temperature variability during the past two millennia
Continental-scale temperature variability during the past two millennia
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DOI：
10.1038/ngeo1797
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发表时间：
2013-05-01
影响因子：
18.3
通讯作者：
Zorita, Eduardo
中科院分区：
文献类型：
--
作者：
Ahmed, Moinuddin;Anchukaitis, Kevin J.;Zorita, Eduardo
过去的全球气候变化具有强烈的区域表现。为了阐明它们的时空模式，我们重建了过去一到两千年来七个大陆尺度区域的过去温度。几乎所有区域温度重建中最连贯的特征是长期降温趋势，该趋势在十九世纪末结束。在数十年至百年尺度上，温度变率显示出明显不同的区域模式，每个半球内的相似性大于它们之间的相似性。没有全球同步的几十年温暖或寒冷的时间间隔来定义世界范围内的中世纪温暖期或小冰期，但所有的重建都显示出公元1580年至1880年之间普遍寒冷的条件，在某些地区被18世纪的温暖几十年打断。北极、欧洲和亚洲向这些较冷条件的转变发生得比北美或南半球地区要早。最近的变暖逆转了长期的冷却;在公元1971-2000年期间，面积加权平均重建温度高于近1,400年来的任何其他时间。
Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between AD 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period AD 1971-2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years.