White Spruce Light Rings in Northwestern Canada
White Spruce Light Rings in Northwestern Canada
复制标题
加拿大西北部的白云杉光环
DOI：
--
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Szeicz
中科院分区：
文献类型：
--
作者：
J. Szeicz
光环年表是从白色云杉（云杉glauca [Moench] Voss）在6个地点在加拿大的育空地区和西北地区西部，以评估其时空分布和调查的气候因素，导致其形成。使用活化石和亚化石材料制作的年表长度从350年到800年不等。在公元1641年至1989年的几个关键年份，所有或大多数地点的大多数树木都出现了光环，这表明它们对树木年轮记录的区域交叉定年非常有用。光环记录与气候数据的比较表明，白色云杉光环的形成与6月至8月的平均温度有关，重点是8月的低温。加拿大西北部显著的白色云杉光环年与北方魁北克北部的黑色云杉光环年不同，这可能是由于两个地区天气环流模式的差异，因此交叉定年可能仅限于区域尺度。
Light ring chronologies are developed from white spruce (Picea glauca [Moench] Voss) at six sites in the Yukon and western Northwest Territories of Canada in order to evaluate their spatiotemporal distribution and to investigate the climatic factors leading to their formation. The chronologies, produced using both living and subfossil material, vary in length from 350 yr to 800 yr. In several key years during the common interval A.D. 1641-1989, light rings developed in a majority of trees at all or most of the sites, indicating their usefulness for regional crossdating of tree-ring records. Comparison of light ring records with climate data at the northernmost site suggests white spruce light ring formation is related to below average June to August tempertures, with an emphasis on low August temperatures. Prominent white spruce light ring years in northwestern Canada are different from black spruce light ring years in northern Quebec, probably due to the differences in synoptic circulation patterns between the two regions, and thus cross-dating may be limited to the regional scale.