1200 years of warm-season temperature variability in central Scandinavia inferred from tree-ring density
1200 years of warm-season temperature variability in central Scandinavia inferred from tree-ring density
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DOI：
10.5194/cp-12-1297-2016
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发表时间：
2015-02
影响因子：
4.3
通讯作者：
Peng Zhang;H. Linderholm;B. Gunnarson;J. Björklund;Deliang L. Chen
中科院分区：
文献类型：
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作者：
Peng Zhang;H. Linderholm;B. Gunnarson;J. Björklund;Deliang L. Chen
摘要。尽管世界各地出现了新的高分辨率温度重建，但只有少数覆盖了中世纪气候异常（MCA）。在这里，我们展示了C-Scan，一种新的基于苏格兰松树年轮密度的斯堪的纳维亚中部温暖季节（4月至9月）温度重建，可追溯到公元850年，将之前的重建延长了250年。C-Scan基于在有限山区采集的样本，根据海拔和当地环境的差异进行调整，并使用新的RSFi算法进行标准化，以保留低频信号。在C-Scan中，MCA的暖峰出现在约1000-1100 CE，小冰期（LIA）出现在1550 - 1900 CE之间。此外，在过去的一千年中，最冷的几十年出现在公元1600年左右，而最温暖的10年和30年出现在最近的一个世纪。通过对比C-Scan与Fennoscandia的其他千年温度重建，揭示了多年代际温度变化的区域差异，特别是在上一千年的暖期。尽管这些差异可能是由于方法上的原因，但它们可能表明整个芬诺斯坎迪亚的非同步变暖模式。需要进一步研究这些区域差异及其背后的原因和机制。
Abstract. Despite the emergence of new high-resolution temperature reconstructions around the world, only a few cover the Medieval Climate Anomaly (MCA). Here we present C-Scan, a new Scots pine tree-ring density-based reconstruction of warm-season (April–September) temperatures for central Scandinavia back to 850 CE, extending the previous reconstruction by 250 years. C-Scan is based on samples collected in a confined mountain region, adjusted for their differences in altitude and local environment, and standardised using the new RSFi algorithm to preserve low-frequency signals. In C-Scan, the warm peak of MCA occurs ca. 1000–1100 CE, and the Little Ice Age (LIA) between 1550 and 1900 CE. Moreover, during the last millennium the coldest decades are found around 1600 CE, and the warmest 10 and 30 years occur in the most recent century. By comparing C-Scan with other millennium-long temperature reconstructions from Fennoscandia, regional differences in multi-decadal temperature variability, especially during the warm period of the last millennium are revealed. Although these differences could be due to methodological reasons, they may indicate asynchronous warming patterns across Fennoscandia. Further investigation of these regional differences and the reasons and mechanisms behind them are needed.