A high-resolution reconstruction of Storglaciaren mass balance back to 1780/81 using tree-ring data and circulation indices

作者：Linderholm Hans W^*; Jansson Peter; Chen Deliang

来源：Quaternary Research, 2007, 67(1): 12-20.

DOI：10.1016/j.yqres.2006.08.005

• mass-balance reconstruction
• tree rings
• circulation indices
• Storglaciaren
• northern Sweden

Storglaciaren in northernmost Sweden has the world's longest ongoing continuous mass-balance record, starting in 1946. To extend this mass-balance record, we have reconstructed summer (b(S)) and winter (b(W)) mass balances separately back to the mass balance year 1780/81 with annual resolution. We used tree-ring data for b(S) and a set of circulation indices, based on the sea-level pressure, for b(W). Both proxies have correlation coefficients with respective mass balance components of ca. 0.7. The reconstructed net balance (b(N)) of Storglaciaren was well correlated to the observations during 1946-1980 (r=0.8, p < 0.05). Our reconstruction agrees well with previously obtained results of northern Sweden glacier variability, where the predominantly positive bN years between 1890 and 1910 correspond to the well documented post-Little lee Age advance of Storglaciaren. Furthermore, the results suggest that bs, as a function of summer temperatures, is more important than bw in determining the bN, which is contrary to glaciers in the maritime parts of western Scandinavia. In general, bN has been negative over the last 220 yr, suggesting a predomination of continental conditions over northern Sweden. However, the influence of bw increased in the late twentieth century, indicating a shift to a more oceanic climate regime.

• 出版日期2007-1
• 单位国家气候中心