Hydroclimate variability in the North China Plain and its link with El Ni o Southern Oscillation since 1784 A.D.Insights from tree-ring cellulose D18o
Hydroclimate variability in the North China Plain and its link with El Ni o Southern Oscillation since 1784 A.D.Insights from tree-ring cellulose D18o
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公元1784年以来华北平原水文气候变化及其与厄尔尼诺南方涛动的联系.来自树木年轮纤维素D18o的见解
DOI：
10.1029/2011jd015987
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发表时间：
2011
影响因子：
--
通讯作者：
Q
中科院分区：
文献类型：
--
作者：
Li;Q
本文根据华北平原（34°-41 ° N，107°-120 ° E）5棵华北落叶松（Larix principis-ruprechtirites）的年轮纤维素δ 18 O测定结果，建立了1784 - 2003年的年轮纤维素δ 18 O年表。这一年表有一个显着的，与夏季降水量，相对湿度和帕尔默干旱严重程度指数的负相关。通过与CRU TS 3降水格点数据集的空间相关分析，它代表了NCP区域夏季水文气候变率。从历史上看，极端气候事件（干旱和洪水）可以通过年表中的高频（年度）信号来检测。低频（11年移动平均）信号与NCP历史文献中的干旱频率和区域干湿指数的时间序列一致。1954-2003年和1854-2003年期间，NCP测得的降水和树木年轮纤维素δ 18 O年代学与赤道东太平洋实测海表温度的显著空间相关模式表明，NCP夏季水文气候与厄尔尼诺-南方涛动有密切联系。年表确定的极端干旱或潮湿年份大多分别发生在过去220年的历史厄尔尼诺或拉尼娜事件之后。
We present here a chronology of tree‐ring celluloseδ18O from 1784 to 2003 that is based on the individual measurements of fiveLarix principis‐rupprechtiitrees growing in the semiarid North China Plain (NCP; 34°–41°N, 107°–120°E). This chronology has a significant, negative correlation with summer precipitation, relative humidity, and the Palmer Drought Severity Index. It is representative of regional summer hydroclimate variability in the NCP by analyzing its spatial correlation patterns with CRU TS3 precipitation grid data sets. Historically, extreme climate events (drought and flood) could be detected by the high‐frequency (annual) signals in the chronology. The low‐frequency (11 year moving average) signals are consistent with the time series of the drought frequency and the regional dryness‐wetness index derived from historical documents in the NCP. Significant spatial correlation patterns of measured precipitation and the tree‐ring celluloseδ18O chronology from the NCP with observed sea surface temperature in the eastern equatorial Pacific during the 1954–2003 and 1854–2003 periods suggest that the summer hydroclimate of the NCP has a close link with El Niño–Southern Oscillation. Mostly extreme dry or wet years identified by the chronology follow historical El Niño or La Niña events over the past 220 years, respectively.