利用树木年轮重建公元1639—2013年青南高原5~9月相对湿度变化

doi:10.12118/j.issn.1000-6060.2018.05.12

摘要/Abstract

摘要： 利用采集自青海省杂多县昂赛乡分布的大果圆柏建立树轮宽度差值年表（RES）。相关分析结果表明：青南高原5~9月平均大气相对湿度与树轮宽度差值年表具有显著的正相关关系，相关系数达0.65（建模期，1969-2013年）。利用差值年表重建了青南高原过去375 a的5~9月平均相对湿度变化序列，重建方程方差解释量达42.3%，且方程稳定。在重建的375 a中，显著的偏湿阶段有5个：1694-1710年、1753-1778年、1830-1847年、1892-1908年和1978-1989年；显著的偏干阶段有8个：1646-1673年、1682-1693年、1711-1731年、1735-1752年、1796-1809年、1817-1829年、1848-1861年和1873-1886年。采用多窗谱分析（MTM）发现，重建序列具有28~30 a的长周期，6~9 a和2~5 a的短周期。此次重建序列与其他一些能反映青藏高原地区干湿状况的树轮重建序列在低频上存在较好的一致性，而且与同期相关格点夏季帕尔默干旱指数（MADA）在公共区间（1639-2005年）的相关系数达0.489（P<0.001，n=367），进一步证明了本文重建序列的准确性。

关键词: 青南高原, 树轮宽度差值年表, 相对湿度, 重建

Abstract: The study of relative humidity is important to understand better the past climatic variations.However,there have been few long-term humidity reconstructions using tree-ring widths worldwide.In this paper,we established a reconstruction of mean relative humidity from May to September from AD 1639 to 2013 using Sabina tibetica Kom from the southern Qinghai Plateau region in the northeastern Tibetan Plateau,China.In total,there were 56 tree cores from 28 trees collected at Angsai Township of Zaduo County of Qinghai Province (AS,95°37.765'E,32°42.856'N).All samples were surfaced,cross-dated and measured according to standard dendrochronology techniques.The reconstructed equation was stable and reliable and its variance interpretation quantity reached 42.3%.In the past 375 years,there were five wet periods (1694-1710,1753-1778,1830-1847,1892-1908,and 1978-1989) and eight dry periods (1646-1673,1682-1693,1711-1731,1735-1752,1796-1809,1817-1829,1848-1861 and 1873-1886) in the reconstructed humidity sequence.The longest wet period is 1753-1778 (26 years),and the longest dry period is 1646-1673 (28 years).There were 12 extremely dry years:1689,1700,1724,1727,1739,1749,1872,1910,1942,1953,1995 and 1998;and 5 extremely wet years:1640,1699,1703,1704 and 1873.The multi-taper method (MTM) spectral analysis indicates that there are 3 periodic changes of 28-30 a,6-9 a,2-5 a.The 2-5 a cycle may be related to the Quasi-biennial and Southern Oscillations influenced by the constant change between east wind and west wind in the equatorial stratosphere in a cycle of 26-30 months.The 6-9 a cycle may be related to ENSO.By comparing the reconstructed sequence from this study with a few typical reconstructed series which can reflect the status of dry and wet in the Southern Qinghai Plateau,it is found that there were four curves which shared the same wet periods (1710s,1830s-1840s and 1890s-1900s) and drought periods (1660s,1680s-1690s,1730s-1740s,1820s and 1950s) at an inter-annual scale.The result shows that these series presented good consistency on the change of low frequency.Moreover,our relative humidity reconstruction was correlated well with the corresponding grids MADA dataset in the public section during the common period.All of these have proved the accuracy of the reconstruction sequence in this paper.

Key words: southern Qinghai Plateau, tree-ring residual chronology, relative humidity, reconstruction

中图分类号:

P467

黄小梅, 肖丁木, 秦宁生. 利用树木年轮重建公元1639—2013年青南高原5~9月相对湿度变化[J]. 干旱区地理, 2018, 41(5): 1001-1008.

HUANG Xiao-mei, XIAO Ding-mu, QIN Ning-sheng. Tree-ring based reconstruction of relative humidity from May to September in southern Qinghai Plateau during AD 1639-2013[J]. 干旱区地理, 2018, 41(5): 1001-1008.

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