A late-winter to early-spring temperature reconstruction for southeastern Norway from 1758 to 2006
A late-winter to early-spring temperature reconstruction for southeastern Norway from 1758 to 2006
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DOI：
10.3189/172756407782871657
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发表时间：
2007-10
影响因子：
2.9
通讯作者：
Ø. Nordli;E. Lundstad;A. Ogilvie
中科院分区：
文献类型：
--
作者：
Ø. Nordli;E. Lundstad;A. Ogilvie
直到世纪初，挪威才进行了系统的温度观测，而且只是零星的。气候替代数据可以用来重建这一时期之前的温度，但到目前为止，还没有任何气候替代数据可用于冬末。这种情况最近发生了变化，因为在挪威东南部兰斯峡湾湖附近的一个农场发现了一本日记，其中载有历史上的冰破裂数据。这些数据，再加上同一地区米约萨湖的观测结果，使我们有可能重建1758年的温度。重建的系列，结合湖泊附近地区的仪器系列，合并成一个复合时间序列，涵盖1758-2006年。最低温度出现在世纪早期的道尔顿太阳黑子极小期。20世纪比19世纪高1.3摄氏度，而19世纪比18世纪的最后43年高0.4摄氏度。在1758-1850年期间，平均气温比20世纪的平均值低1.4摄氏度。在整个系列中，90年代和21世纪初观察到的温暖是前所未有的。
Abstract Systematic temperature observations were not undertaken in Norway until the early 19th century, and even then only sporadically. Climate-proxy data may be used to reconstruct temperatures before this period, but until now there have not been any climate proxies available for late winter. This situation has recently changed, as a diary containing historical ice break-up data from a farm near lake Randsfjord in southeastern Norway has been discovered. These data, together with observations from lake Mjøsa in the same region, make it possible to reconstruct temperature back to 1758. The reconstructed series, combined with instrumental series from the area near the lake, were merged into one composite time series covering the period 1758–2006. The lowest temperatures are seen during the Dalton sunspot minimum in the early 19th century. The 20th century was 1.3˚C warmer than the 19th century, whereas the 19th century was 0.4˚C warmer than the last 43 years of the 18th century. During the period 1758–1850, the mean temperature was 1.4˚C lower than the mean value of the 20th century. The warmth observed in the 1990s and at the start of the 21st century is unprecedented during the whole series.