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首页> 外文期刊>Chinese science bulletin >Variations of the spring precipitation day numbers reconstructed from tree rings in the Urumqi River drainage, Tianshan Mts. over the last 370 years
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Variations of the spring precipitation day numbers reconstructed from tree rings in the Urumqi River drainage, Tianshan Mts. over the last 370 years

机译：从天山乌鲁木齐河排水树年轮重建的春季降水日数的变化。在过去的370年中

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摘要

The tree-ring cores of Tianshan spruces collected from nine sites in the Urumqi River drainage of the middle Tianshan Mountains were used to establish three types of the tree-ring width chronologies over the last 370 years, using the international standard method of dendrochronology. Our study demonstrates that dendrochronology can be better used to reconstruct the number of the precipitation day than to reconstruct the precipitation amount in middle Tianshan Mountains. It is found that the residual chronology among the three tree-ring width chronologies has the best relationship with number of spring precipitation days from May 20 to June 8. The chronologies at Haxiong-gou B site and Zaierdegou site in the Urumiqi drainage have the highest correlation with the observed number of spring precipitation days at Daxigou meteorological station, and are used to reconstruct the spring precipitation days over the last 370 years in the drainage. The main significant decreasing trend of the number of the spring precipitation days occurred during 1665 — 1717, while the significant increasing trends happened during 1805 — 1841 and 1914 — 1943. The reconstructed series of the number of spring precipitation days has quasi-periodic variations of 3.3, 2.1, 2.5, 12.3 and 32.0 years with the dominated short periodical changes. The long cycle of 32 years is shown quite clearly in the 10-year smoothed sequence. The maximum spring precipitation days occurred mainly in the 1630s, 1840s and 1940s, while the lowest number of spring precipitation days for the 10-year average occurred in the 1710s.
机译：从天山中段的乌鲁木齐河流域的9个站点收集的天山云杉的年轮树芯，使用国际标准的年代学方法，在过去370年中用于建立三种类型的年轮宽度年表。我们的研究表明，树状年代学比重建天山中部地区的降水量更好地用于重建降水日数。结果表明，从5月20日至6月8日，三个树轮宽度年表中的剩余年表与春季降水日数的关系最好。乌鲁木齐流域哈雄沟B站和宰尔德沟站的年表最高。与大溪沟气象站的春季降水日数相关，并用于重建最近370年排水中的春季降水日数。春季降水天数的主要显着下降趋势发生在1665年至1717年，而显着增长趋势发生在1805年1841年和1914-1943年。重建的春季降水天数序列具有准周期变化。 3.3、2.1、2.5、12.3和32.0年，主要是短期变化。在10年平滑序列中非常清楚地显示了32年的长周期。春季降水的最大天数主要发生在1630、1840和1940年代，而十年平均值的春季降水天数最少的是1710年代。

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