A NEW RECONSTRUCTION OF TEMPERATURE VARIABILITY IN THE EXTRA-TROPICAL NORTHERN HEMISPHERE DURING THE LAST TWO MILLENNIA
A NEW RECONSTRUCTION OF TEMPERATURE VARIABILITY IN THE EXTRA-TROPICAL NORTHERN HEMISPHERE DURING THE LAST TWO MILLENNIA
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DOI：
10.1111/j.1468-0459.2010.00399.x
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发表时间：
2010-01-01
影响因子：
1.5
通讯作者：
Ljungqvist, Fredrik Charpentier
中科院分区：
文献类型：
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作者：
Ljungqvist, Fredrik Charpentier
本文提出了一个新的热带外北方半球（90-30 ° N）近2000年的年代际分辨率温度重建。利用许多以前从未包括在任何大规模温度重建中的古温度代用记录。在百年时间尺度上重建的温度变率的幅度超过0.6摄氏度。该重建首次显示了公元1-300年的明显罗马暖期，达到1961-1990年的平均温度水平，接着是黑暗时代寒冷期，大约公元300-800年。中世纪温暖期，大约公元800-1300年，小冰期，大约公元1300-1900年。随后在二十世纪温度迅速升高。重建中的最高平均温度出现在10世纪中后期，最低温度出现在17世纪后期。十年平均温度在罗马温暖期和中世纪温暖期的大量时段达到或超过1961-1990年的平均温度水平。过去二十年的温度，然而，可能比过去两千年来的任何时候都要高，尽管这只在仪器温度数据中看到，而不是在多代理重建本身中看到，但我们的温度重建与Moberg等人（2005）和Mann等人（2008）的重建吻合良好。尽管在数据覆盖范围和方法上存在显著差异，但在变化幅度以及温暖和寒冷时期的时间方面，除了公元300-800年的时期c
A new temperature reconstruction with decadal resolution covering the last two millennia is presented for the extra-tropical Northern Hemisphere (90-30 degrees N). utilizing many palaeo-temperature proxy records never previously included in any large-scale temperature reconstruction The amplitude of the reconstructed temperature variability on centennial time-scales exceeds 0 6 degrees C This reconstruction is the first to show a distinct Roman Warm Period c AD 1-300, reaching up to the 1961-1990 mean temperature level, followed by the Dark Age Cold Period c AD 300-800 The Medieval Warm Period is seen c AD 800-1300 and the Little Ice Age is clearly visible c AD 1300-1900. followed by a rapid temperature increase in the twentieth century The highest average temperatures m the reconstruction are encountered in the mid to late tenth century and the lowest in the late seventeenth century Decadal mean temperatures Scent to have reached or exceeded the 1961-1990 mean temperature level during substantial pails of the Roman Warm Period and the Medieval Warm Period The temperature of the last two decades, however, is possibly higher than during any previous time in the past two millennia, although this is only Seen in the instrumental temperature data and not in the multi-proxy reconstruction itself Our temperature reconstruction agrees well with the reconstructions by Moberg et al (2005) and Mann et al (2008) with regard to the amplitude of the variability as well as the timing of warm and cold periods, except for the period c AD 300-800, despite significant differences in both data coverage and methodology