利用昌灵山早材宽度年表重建腾格里沙漠南缘在过去315 a的5~6月份PDSI指数变化, 重建方程的方差解释量达42.0%。腾格里沙漠南缘5~6月的PDSI指数重建序列平均值为-0.32。腾格里沙漠南缘5~6月的PDSI指数重建序列对西北地区干旱极端历史事件有良好的响应。空间分析显示腾格里沙漠南缘5~6月的PDSI指数重建序列与亚洲季风尾闾区PDSI指数的变化比较一致,同时还与西北地区的多条PDSI指数重建序列有着良好的相关性。腾格里沙漠南缘5~6月的PDSI指数重建序列具有25 a(95%)、12 a(95%)、3.4 a(99%)、2.8 a(99%)、2.6 a(99%)、2.3 a(95%)的周期变化。
We presented a drought reconstruction for the northern central China based on the earlywood width chronology developed from one site of Pinus tabulaeformis at South Margin of Tengger Desert, China. The drought reconstruction in 1691-2005 was developed by calibrating tree-ring data with the Palmer Drought Severity Index (PDSI), which is used to describe the regional moisture condition properly. The reconstruction was verified with the independent data, and accounted for 42.0% of the actual PDSI variance during their common period (1960-2005). The mean PDSI over the 1691-2005 period was estimated at-0.32. The full reconstruction indicated that the regional drought variability was variable and persistent. The comparison between the reconstructed PDSI and historical archives and other reconstructions was conducted based on tree-ring in Northwest China. The results revealed common climatic extremes and change over much of Northwest China. Many of these events have had profound impacts on human being over the past several centuries. The drought epoch in the late 1920s was the most severe one in our reconstruction. The wet epochs in the 1730s and the 1750s were the wettest in our reconstruction. Spatial correlations between the PDSI 5-6 reconstruction and the girded PDSI dataset showed that the reconstruction varied indifferent areas; which were affected by the Asian monsoon. The multitaper method (MTM) spectral analysis indicated that there are 6 periodic change of 25 a (95%), 12 a (95%), 3.4 a (99%), 2.8 a (99%), 2.6 a (99%), 2.3 a (95%), which is similar with the PDSI reconstructions at East Margin of Tengger Desert and South Margin of Badain Jaran Desert.
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