Rainfall history for the Hexi Corridor in the arid northwest China during the past 620 years derived from tree rings
Rainfall history for the Hexi Corridor in the arid northwest China during the past 620 years derived from tree rings
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DOI：
10.1002/joc.2143
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发表时间：
2011-06
期刊：
影响因子：
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通讯作者：
Bao Yang;C. Qin;A. Bräuning;I. Burchardt;Jingjing Liu
中科院分区：
文献类型：
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作者：
Bao Yang;C. Qin;A. Bräuning;I. Burchardt;Jingjing Liu
我们提供了一个620年的环宽记录从祁连山中部，在那里它是目前由西风控制。祁连圆柏（Sabinaprzewalskii）生长于甘肃省北方祁连山西部分布区边缘附近。年轮宽度和年（7月至6月）降水量之间的线性回归模型解释了1952年至2007年期间观测到的仪器降水方差的34.9%。重建与网格降水数据之间的空间相关性分析表明，年降水量重建捕捉到了祁连山及附近河西走廊的区域气候变化。我们还显示了缩放的标准年表调整的平均值和方差的仪器数据。相对湿润的时期被确定为AD 1390-1413，1425-1450，1530-1649，1792-1920，1937-1949和1980-1985。干旱条件盛行于公元1414-1424年、1451-1529年、1650-1791年、1921-1936年、1950-1979年和1986-2007年。与基于回归的重建相比，缩放重建表明1390-1413年，1425-1450年，1570-1630年和1790-1920年期间的潮湿条件相当多。公元1451-1529年是河西走廊近600年来干旱强度最大、持续时间最长的时期。这次干旱不仅发生在祁连山，也发生在中国的北方和东部。这可能是由于当时太阳活动和火山活动的共同作用，导致亚洲夏季风明显减弱所致。研究结果还表明，在过去的几个世纪里，河西走廊在十年到百年的时间尺度上受到亚洲季风环流的控制。皇家气象学会
We present a 620‐year long ring width record from the middle Qilian Mountains, where it is presently controlled by the Westerlies. The chronology was developed from Qilian juniper (Sabina przewalskii) growing at sites near the western distribution limit of the species in the northern Qilian Mountains, Gansu Province, China. A linear regression model between ring width and annual (July to June) precipitation accounts for 34.9% of the observed instrumental precipitation variance during the period 1952 to 2007. Spatial correlation analyses between the reconstruction and gridded precipitation data shows that the annual precipitation reconstruction captures regional climatic variations over the Qilian Mountains and the nearby Hexi Corridor. We also show the scaled standard chronology adjusted to the mean and variance of the instrumental data. Relatively wet periods are identified for AD 1390–1413, 1425–1450, 1530–1649, 1792–1920, 1937–1949 and 1980–1985. Dry conditions prevailed during AD 1414–1424, 1451–1529, 1650–1791, 1921–1936, 1950–1979 and 1986–2007. In comparison with the regression‐based reconstruction, the scaled reconstruction indicates considerably wetter conditions during 1390–1413, 1425–1450, 1570–1630 and 1790–1920. The interval AD 1451–1529 was the most intense and longest drought epoch in the Hexi Corridor over the past six centuries. This drought was not only recorded in the Qilian Mountains but also occurred in northern and eastern China. It might be caused by a substantial weakening of the Asian summer monsoon induced by the joint effects of solar and volcanic activities at that time. Our results also suggest that the Hexi Corridor was under the control of the Asian monsoon circulation on inter‐decadal to centennial timescales in the past centuries. Copyright © 2010 Royal Meteorological Society