A new climate era in the sub-Arctic: Accelerating climate changes and multiple impacts
A new climate era in the sub-Arctic: Accelerating climate changes and multiple impacts
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DOI：
10.1029/2009gl042064
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发表时间：
2010-07-29
影响因子：
5.2
通讯作者：
Johansson, Margareta
中科院分区：
文献类型：
--
作者：
Callaghan, Terry V.;Bergholm, Fredrik;Johansson, Margareta
自2000年以来，瑞典亚北极地区的气候变暖已达到统计分析首次表明当前变暖已超过1930年代末和1940年代初的水平，并已大大超过0摄氏度的年平均温度阈值，造成许多冰冻圈和生态影响。气温加速上升的趋势导致了一个世纪以来积雪厚度增加、湖冰减少、活动层厚度增加、湖水TOC（总有机碳）浓度和硅藻组合增加以及树木位置和植物群落结构变化等类似趋势。其中一些影响在世纪的第一个温暖时期并不明显。气候变化与温度变化减少有关，特别是冬季寒冷和夏季凉爽的减少，以及导致山坡不稳定和基础设施故障的极端降水事件的增加。这里首次汇编的多个当地环境因素的长期记录为制定适应战略提供了详细信息，而特别易受气候变化影响的环境的巨大变化突出表明需要采取全球缓解战略。引用：Callaghan，T.五、F. Bergholm，T. R.克里斯滕森角，澳-地Jonasson，U. Kokfelt和M. Johansson（2010），《亚北极的新气候时代：加速气候变化和多重影响》，Geophys。保留信函：37，L14705，doi：10.1029/2009GL042064。
Climate warming in the Swedish sub-Arctic since 2000 has reached a level at which statistical analysis shows for the first time that current warming has exceeded that in the late 1930' s and early 1940' s, and has significantly crossed the 0 degrees C mean annual temperature threshold which causes many cryospheric and ecological impacts. The accelerating temperature increase trend has driven similar trends in the century-long increase in snow thickness, loss of lake ice, increases in active layer thickness, lake water TOC (total organic carbon) concentrations and the assemblages of diatoms, and changes in tree-line location and plant community structure. Some of these impacts were not evident in the first warm period of the 20th Century. Changes in climate are associated with reduced temperature variability, particularly loss of cold winters and cool summers, and an increase in extreme precipitation events that cause mountain slope instability and infrastructure failure. The long term records of multiple, local environmental factors compiled here for the first time provide detailed information for adaptation strategy development while dramatic changes in an environment particularly vulnerable to climate change highlight the need to adopt global mitigation strategies. Citation: Callaghan, T. V., F. Bergholm, T. R. Christensen, C. Jonasson, U. Kokfelt, and M. Johansson (2010), A new climate era in the sub-Arctic: Accelerating climate changes and multiple impacts, Geophys. Res. Lett., 37, L14705, doi:10.1029/2009GL042064.