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Improving a tree-ring reconstruction from west-central Scandinavia: 900 years of warm-season temperatures

机译：改善斯堪的纳维亚半岛中西部的树木年轮重建：900年的暖季温度

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摘要

Dendroclimatological sampling of Scots pine (Pinus sylvestris L.) has been made in the province of Jamtland, in the west-central Scandinavian mountains, since the 1970s. The tree-ring width (TRW) chronology spans several thousand years and has been used to reconstruct June-August temperatures back to 1632 bc. A maximum latewood density (MXD) dataset, covering the period ad 1107-1827 (with gap 1292-1315) was presented in the 1980s by Fritz Schweingruber. Here we combine these historical MXD data with recently collected MXD data covering ad 1292-2006 into a single reconstruction of April-September temperatures for the period ad 1107-2006. Regional curve standardization (RCS) provides more low-frequency variability than "non-RCS" and stronger correlation with local seasonal temperatures (51 % variance explained). The MXD chronology shows a stronger relationship with temperatures than the TRW data, but the two chronologies show similar multi-decadal variations back to ad 1500. According to the MXD chronology, the period since ad 1930 and around ad 1150-1200 were the warmest during the last 900 years. Due to large uncertainties in the early part of the combined MXD chronology, it is not possible to conclude which period was the warmest. Morernsampling of trees growing near the tree-line is needed to further improve the MXD chronology.
机译：自1970年代以来，已经在斯堪的纳维亚中西部山区的Jamtland省进行了苏格兰松树（Pinus sylvestris L.）的树状气候学采样。树轮宽度（TRW）年表跨越数千年，已被用于重建6-8月份的温度，直至1632 bc。 Fritz Schweingruber于1980年代提出了一个最大的晚木密度（MXD）数据集，涵盖了广告期1107-1827（间隔为1292-1315）。在这里，我们将这些历史MXD数据与最近收集的涵盖广告1292-2006的MXD数据结合在一起，重建了广告1107-2006年4月至9月的温度。与“非RCS”相比，区域曲线标准化（RCS）提供了更多的低频变化，并且与当地季节性温度之间的相关性更强（解释了51％的变化）。 MXD年表显示的温度与温度的关系比TRW数据更强，但是这两个年表显示的相似的年代际变化可以追溯到公元1500年。根据MXD年表，公元1930年和公元1150-1200年之间的时间段最热最近900年。由于合并MXD年代的早期不确定性很大，因此无法推断哪个时期最温暖。需要对树线附近生长的树木进行更多采样，以进一步改善MXD的时间顺序。

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