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Highly variable Northern Hemisphere temperatures reconstructed fromlow-and high-resolution proxy data

机译:从低分辨率和高分辨率代理数据重建高度变化的北半球温度

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A number of reconstructions of millennial-scale climate variability have been carried out in order to understand patterns of natural climate variability, on decade to century timescales, and the role of anthropogenic forcing. These reconstructions have mainly used tree-ring data and other data sets of annual to decadal resolution. Lake and ocean sediments have a lower time resolution, but provide climate information at multicentennial timescales that may not be captured by tree-ring data. Here we reconstruct Northern Hemisphere temperatures for the past 2,000 years by combining low-resolution proxies with tree-ring data, using a wavelet transform technique to achieve timescale-dependent processing of the data. Our reconstruction shows larger multicentennial variability than most previous multi-proxy reconstructions, but agrees well with temperatures reconstructed from borehole measurements and with temperatures obtained with a general circulation model. According to our reconstruction, high temperatures: similar to those observed in the twentieth century before 1990: occurred around AD 1000 to 1100, and minimum temperatures that are about 0.7 K below the average of 1961-90 occurred around AD 1600. This large natural variability in the past suggests an important role of natural multicentennial variability that is likely to continue.
机译:为了了解自然气候变率的模式,十年到世纪的时间尺度以及人为强迫的作用,已经对千年尺度的气候变率进行了许多重建。这些重建主要使用了年轮解析度的年轮数据和其他数据集。湖泊和海洋沉积物的时间分辨率较低,但是可以提供多年百年尺度的气候信息,而树木年轮数据可能无法捕获这些信息。在这里,我们通过使用小波变换技术将低分辨率代理与年轮数据结合起来,重构了过去2000年的北半球温度,从而实现了数据的时标相关处理。我们的重建显示出比大多数以前的多代理重建更大的百年变化,但与从井眼测量重建的温度以及通过常规循环模型获得的温度非常吻合。根据我们的重建,高温(类似于1990年之前的20世纪观察到的高温)发生在公元1000年至1100年左右,而最低温度大约是1961-90年平均温度的0.7 K,发生在公元1600年左右。这种大的自然变异性过去表明自然百年变化的重要作用很可能会持续下去。

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