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Precipitation variability during the past 400 years in the Xiaolong Mountain (central China) inferred from tree rings

机译:根据树木年轮推断小龙山(中国中部)近400年来的降水变化

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摘要

We developed the first tree-ring chronology, based on 73 cores from 29 Pinus tabulaeformis trees, for the Xiaolong Mountain area of central China, a region at the boundary of the Asian summer monsoon. This chronology exhibits significant (at 0.01 level) positive correlations with precipitation in May and June, and negative correlations with temperature in May, June and July. Highest linear correlation is observed between tree growth and the seasonalized (April-July) precipitation, suggesting that tree rings tend to integrate the monthly precipitation signals. Accordingly, the April-July total precipitation was reconstructed back to 1629 using these tree rings, explaining 44.7 % of the instrumental variance. A severe drought occurred in the area during the 1630s-1640s, which may be related to the weakened Asian summer monsoon caused by a low land-sea thermal gradient. The dry epoch during the 1920s-1930s and since the late 1970s may be explained by the strengthened Hadley circulation in a warmer climate. The dry (wet) epochs of the 1920s-1930s (the 1750s and 1950s) occurred during the warm (cold) phases of the El Nino-Southern Oscillation and the Pacific Decadal Oscillation that are often associated with weakened (strengthened) East Asian summer monsoon. These relationships indicate significant teleconnections operating over the past centuries in central China related to large-scale synoptic features.
机译:我们以亚洲29个油松树的73个核心为基础,为亚洲中部季风边界处的中国中部的小龙山地区开发了第一个树年轮年代学。该年表与5月和6月的降水呈显着正相关(在0.01水平),而5月,6月和7月与温度呈负相关。在树木生长和季节性(4月至7月)降水之间观察到最高的线性相关性,这表明树木年轮倾向于整合每月的降水信号。因此,使用这些年轮将4月至7月的总降水量重建到1629年,解释了仪器变化的44.7%。 1630年代至1640年代期间该地区发生了严重的干旱,这可能与低陆海热梯度引起的亚洲夏季风减弱有关。 1920年代至1930年代以及1970年代后期以来的干旱时期可能是由于哈德利在更温暖的气候中的环流增强所致。 1920年代至1930年代(1750年代和1950年代)的干旱(潮湿)时期发生在厄尔尼诺-南方涛动和太平洋年代际涛动的温暖(寒冷)阶段,通常与东亚夏季风减弱(增强)有关。 。这些关系表明,过去几个世纪以来,在中国中部与大规模天气特征有关的大量遥相关活动。

著录项

  • 来源
    《Climate dynamics》 |2012年第8期|1697-1707|共11页
  • 作者单位

    Key Laboratory of Western China's Environmental Systems (Ministry of Education), Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China, Department of Geosciences and Geography,University of Helsinki, PO Box 64, 00014 Helsinki, Finland;

    Key Laboratory of Western China's Environmental Systems (Ministry of Education), Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;

    Key Laboratory of Western China's Environmental Systems (Ministry of Education), Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;

    Swiss Federal Research Institute WSL, Zuercherstrasse 111,8903 Birmensdorf, Switzerland Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland;

    Key Laboratory of Western China's Environmental Systems (Ministry of Education), Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;

    International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA;

    Department of Palaeontology, Eotvos University, Pazmany setany 1/c, Budapest 1117, Hungary;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tree ring; Precipitation; Central China; Asian summer monsoon; Dendroclimatology;

    机译:年轮;沉淀;中国中部;亚洲夏季风;树状气候学;

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