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首页> 外文期刊>The holocene >Spatial and temporal patterns of variations in tree growth over the northeastern Tibetan Plateau during the period ad 1450-2001
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Spatial and temporal patterns of variations in tree growth over the northeastern Tibetan Plateau during the period ad 1450-2001

机译：1450-2001年间青藏高原东北部树木生长变化的时空格局

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摘要

We analyzed spatial and temporal growth variations of Qilian Junipers over the northeastern Tibetan Plateau (TP) during the period 1450-2001 by applying the empirical orthogonal function (EOF) technique to seven moisture-sensitive tree ring-width chronologies. The first three principal components together explain 78.21% of the total variance.The first principal component (PCI) accounts for 51.58% of the total variance, and represents consistent tree-growth variations in the northeastern TP. The second EOF mode reveals an opposite structure for the southern and northern parts of the northeastern Tibetan Plateau, reflecting the effect of huge topography and associated atmospheric circulation on tree-growth anomalies. The third EOF mode represents an opposite structure for the eastern and western parts of the northeastern Tibetan Plateau, possibly indicating the influence of different branches of atmospheric circulation system in this area. The EOF analysis results of instrumental precipitation data resemble those derived from the seven regional chronologies, providing further support that tree growth is a good indicator of regional precipitation variations. According to the PCI, dry conditions occurred in ad 1450-1510, 1631 -1739, 1765-1833, 1866-1883 and 1921 -1947, whereas periods of relatively wet years are identified for ad 1511 -1630, 1740-1764, 1834-1865, 1884-1920 and 1948-2001. During the past 550 years, 28 years with extreme regional growth depressions was identified. These ring-width extremes generally occurred in century-scale dry periods.The years 1467, 1484, 1641, 1721,and 1928 with extreme tree-growth reductions in the northeastern TP are coeval with severe drought events in eastern China. In addition, the dry intervals or extreme growth depressions generally coincided with cold periods in the northeastern TP and vice versa, implying that the probability of occurrence of wet events in the northeastern TP will be higher in the future under the ongoing global warming.
机译：我们通过将经验正交函数（EOF）技术应用于七个对水分敏感的树木年轮宽度年表，分析了1450-2001年期间青藏高原东北部（TP）祁连杜松的时空生长变化。前三个主成分共同解释了总方差的78.21％。第一个主成分（PCI）占了总方差的51.58％，代表了东北TP中一致的树生长变化。第二种EOF模式揭示了青藏高原东北部南部和北部的相反结构，反映了巨大的地形和相关的大气环流对树木生长异常的影响。第三种EOF模式代表了青藏高原东北部东部和西部的相反结构，这可能表明该地区大气环流系统不同分支的影响。仪器降水数据的EOF分析结果类似于从七个区域年表中得出的结果，进一步证明树木生长是区域降水变化的良好指标。根据PCI，广告1450-1510、1631 -1739、1765-1833、1866-1883和1921 -1947出现了干旱状态，而广告1511 -1630、1740-1764、1834- 1865、1884-1920和1948-2001。在过去的550年中，发现了28年出现了极端的区域增长低迷。这些环宽极端通常发生在百年尺度的干旱时期。东北TP的1467年，1484年，1641年，1721年和1928年极端树木生长减少与中国东部的严重干旱事件同时发生。此外，东北TP的干旱间隔或极端生长下降通常与寒冷时期相吻合，反之亦然，这意味着未来TP在持续的全球变暖下发生潮湿事件的可能性将更高。

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