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Tree-Ring Based Reconstructions of Precipitation for the Southern Canadian Cordillera

机译:基于树状环的加拿大南部山脉降水重建

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摘要

This paper reconstructs precipitation variability in the southern Canadian Cordillera over the past 3–400 years using dendroclimatologicaltechniques. Fifty-three total ring-width (RW) chronologies, 28 earlywood (EW) and 28 latewood (LW) chronologies were developed from open-grown, low-elevation stands of Pseudotsuga menziesii (Douglas-fir) and Pinusponderosa (ponderosa pine) across the southern Canadian Cordillera. RW, EW and LW chronologies from both species were used to develop 13 annual (prior July to current June) precipitation reconstructions across the region. The reconstructions range in length from 165 to 688 years, pass verification tests and capture 39–64% of the variancein the instrumental record. Coincident, prolonged intervals of dry conditions are estimated for the years: 1717–1732, 1839–1859, 1917–1941 and1968–1979. Shorter dry intervals are identified between 1581–1586, 1626–1630,1641–1653 1701–1708, 1756–1761, 1768–1772, 1793–1800,1868–1875, 1889–1897 and 1985–1989. The historic drought of the 1920–1930s was the longest but not the most intense across this area in the last 300 years. Wet conditions occur in the majority of reconstructions for the years: 1689–1700, 1750–55,1778–1789, 1800–1830, 1880–1890, 1898–1916 and 1942–1960. Thesedata, in conjunction with data from adjacent areas, are used to provide the first maps of decadal precipitation anomalies for the region between 1700 and 1990.
机译:本文使用树状气候学技术重建了过去3–400年加拿大南部山脉的降水变化。从开阔,低海拔的Pseudotsuga menziesii(Douglas-fir)和Pinusponderosa(ponderosa pine)的开放,低海拔林分发展了53种总环宽(RW)年表,28种早木(EW)和28种晚木(LW)年表。加拿大南部山脉。利用这两个物种的RW,EW和LW年代,在该地区开展了13次年度(7月至目前的6月)降水重建。重建的长度从165年到688年不等,通过了验证测试,并捕获了仪器记录中39-64%的差异。估计以下年份的一致,延长的干燥条件间隔为:1717–1732、1839–1859、1917–1941和1968–1979。在1581–1586、1626–1630、1641–1653 1701–1708、1756-1761、1768–1772、1793–1800、1868–1875、1889–1897和1985–1989之间确定了较短的干燥间隔。在过去300年中,1920-1930年代历史上的干旱是该地区最长的,但不是最严重的。多年来,大多数重建工作都出现了湿润的条件:1689-1700年,1750-55、1778-1789年,1800-1830年,1880-1890年,1898-1916年和1942-1960年。这些数据与相邻区域的数据一起用于提供1700年至1990年之间该地区年代际降水异常的第一张地图。

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  • 来源
    《Climatic Change》 |2004年第2期|209-241|共33页
  • 作者

    Emma Watson; Brian H. Luckman;

  • 作者单位

    Department of Geography The University of Western Ontario;

    Department of Geography The University of Western Ontario;

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  • 正文语种 eng
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