干旱区生态环境知识资源中心(Arid): 中国西部树木年轮delta~(18)O的气候信号

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	中国西部树木年轮delta~(18)O的气候信号
其他题名	CLIMATIC SIGNALS OF TREE-RING delta~(18)O OVER THE WESTERN CHINA
	徐国保 1; 刘晓宏 1; 陈拓 1; 安文玲 2; 王文志 1; 吴国菊 1; 曾小敏 1; 王波 1
来源期刊	第四纪研究
ISSN	1001-7410
出版年	2015
卷号	35 期号:5 页码:1218-1226
中文摘要	树轮稳定氧同位素比率(delta~(18)O)记录在区域气候重建方面具有一定优势。树轮delta~(18)O记录受树木生长趋势的影响较小,保留了丰富的低频信号,对区域气候变化有较一致的响应。通过对比我国西部1901~2004年树轮delta~(18)O平均值和降水delta~(18)O空间分布特征发现,两者空间分布存在一定的相似性。在青藏高原南部树轮delta~(18)O为低值,而青藏高原北部树轮delta~(18)O为高值。树轮delta~(18)O平均值随树轮样点纬度的向北偏移而增大。树轮delta~(18)O与相邻气象站记录响应分析表明,树轮delta~(18)O和生长季的温度呈显著正相关,与生长季降水和相对湿度呈现显著负相关关系。旋转经验正交函数分析和空间响应分析表明,树轮delta~(18)O在我国西风影响区的新疆北部主要反映与区域干湿变化相关的气候信号;树轮delta~(18)O在西南季风影响的藏东南区主要反映区域水文气候变化信息;然而,在季风和西风影响的交汇区域,树轮delta~(18)O的区域气候信号相对较弱。
英文摘要	Here, we have synthetized 16 tree-ring delta~(18)O series from western part of China; most of sampling sites are distributed on the Tibetan Plateau and the arid region of Northwest China. These sites are mainly near to the local forest upper treeline. Tree samples we selected are from the regional dominant species, including spruce, fir, larch and juniper. We firstly compared the spatial patterns of the mean values of tree-ring delta~(18)O during the period from 1901 to 2004 with the mean values of delta~(18)O in precipitation, and find that tree-ring delta~(18)O share the similar spatial distribution pattern with precipitation delta~(18)O. In addition, tree-ring delta~(18)O shows relative lower values in the southern Tibetan Plateau, while a higher value is revealed in the northern Tibetan Plateau. Tree-ring delta~(18)O values increase along with the latitude of the tree-ring delta~(18)O sampling site, which is similar to the latitude effect of delta~(18)O in precipitation. The climate responses between tree-ring delta~(18)O and meteorological dataset from the nearest tree-ring sampling sites reveal that delta~(18)O in tree rings is significantly positively correlated with the growing season temperature, and is significantly negatively correlated with the growing season precipitation and relative humidity. By rotated empirical orthogonal function analysis and spatial response analysis,we point out that in northern part of Xinjiang, where climate is mainly dominated by the westerly circulations, tree-ring delta~(18)O reflects mainly the regional drought (moisture) conditions; in the southeastern Tibetan Plateau, where climate is dominated by the summer monsoon, tree-ring delta~(18)O records the regional hydroclimate variability ; while in the intersection area between monsoonal area and westerly area, tree-ring delta~(18)O mirrors climate signals relative weakly. Our results suggest that tree-ring delta~(18)O can be an excellent proxy in regional climatic reconstruction based on it’s better ability in keeping the long-frequency climatic signals over larger region. The reinforcement of the ongoing tree-ring isotopic network over the entire China will be helpful to understanding the regional climate change which is linked by differing atmospheric circulations systems and forest dynamics under the significant climate changes in the future.
中文关键词	树木年轮 ; 稳定氧同位素 ; 气候信号 ; 空间变化 ; 中国西部
英文关键词	tree rings delta~(18)O climate change climatic significance spatial variability Western China
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES ; GEOLOGY
WOS研究方向	Meteorology & Atmospheric Sciences ; Geology
CSCD记录号	CSCD:5495338
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232567
作者单位	1.中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室, 兰州, 甘肃 730000, 中国; 2.南京大学地理与海洋科学学院, 南京, 江苏 210023, 中国
推荐引用方式 GB/T 7714	徐国保,刘晓宏,陈拓,等. 中国西部树木年轮delta~(18)O的气候信号[J]. 中国科学院西北生态环境资源研究院,2015,35(5):1218-1226.
APA	徐国保.,刘晓宏.,陈拓.,安文玲.,王文志.,...&王波.(2015).中国西部树木年轮delta~(18)O的气候信号.第四纪研究,35(5),1218-1226.
MLA	徐国保,et al."中国西部树木年轮delta~(18)O的气候信号".第四纪研究 35.5(2015):1218-1226.