A tree-ring based reconstruction of summer relative humidity variability in eastern Mongolian Plateau and its associations with the Pacific and Indian Oceans
A tree-ring based reconstruction of summer relative humidity variability in eastern Mongolian Plateau and its associations with the Pacific and Indian Oceans
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基于树木年轮的蒙古高原东部夏季相对湿度变化及其与太平洋和印度洋的关系重建
DOI：
10.1016/j.palaeo.2015.08.003
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发表时间：
2015-11
期刊：
影响因子：
--
通讯作者：
Heng Tian
中科院分区：
文献类型：
--
作者：
Yuxiang Ge;Lizhi Zhang;Wurigen Bao;Heng Tian
以蒙古高原东部边缘地区呼伦贝尔沙地南部为研究对象，建立了基于两个站点树木年轮宽度的区域年代学。除5月外，该年代学与前12月至9月的相对湿度呈显著正相关。RC与6 ~ 8月平均相对湿度的相关系数最高，表明西洋松的生长状况良好。蒙古气候强烈地反映了季节性的湿度条件。重建了1835 ~ 2013年可靠时段的6 ~ 8月平均相对湿度变化；41.6%的方差发生在1953-2012年的校准期间。在其他基于树木年轮的湿度重建中发现了类似的干旱和降雨波动模式。我们的重建表明，从长期的角度来看，区域水文气候变化的特征，如20世纪90年代末至21世纪初的干旱和低湿，并不罕见，正如从树木年轮材料获得的水文记录所显示的那样。赤道东太平洋和热带印度洋相对湿度重建的频谱分析结果和显著的海表温度空间相关性表明，蒙古高原东部的湿度与遥远海洋之间存在密切联系。当与El Niño-Southern涛动相关的海温高（低）时，印度夏季风在北端的强度减弱（增强）。因此，华北地区和本研究区水汽减少（即相对湿度低）。由于热带印度洋海温的增强，亚洲和印度洋之间的低陆海热对比也影响了印度夏季风的水汽转移强度，从而减少了蒙古高原东部的水汽变化。
A regional chronology (RC) based on tree-ring-width data at two sites was developed for the southern Hulun Buir Sandy Land, a marginal area of the eastern Mongolian Plateau, China. This chronology significantly and positively correlated with the relative humidity from the previous December to September, except in May. The highest correlation of the RC with the mean June–August relative humidity suggested that the growth ofPinus sylvestrisvar.mongolicastrongly reflects seasonal moisture conditions. Consequently, the variation in the mean June–August relative humidity was reconstructed for the reliable time period of 1835–2013; 41.6% of the variance occurred during the calibration period of 1953–2012. Similar patterns of drought and pluvial fluctuations were found in other tree-ring-based moisture reconstructions. Our reconstruction implied that the characteristics of regional hydroclimatic variations, such as the drought and low humidity of the late 1990s to 2000s, were not unusual from the long-term perspective, as suggested by the hydrological records obtained from tree-ring material. Spectrum analyses results and significant spatial correlations of our relative humidity reconstruction with the sea surface temperature (SST) in the eastern equatorial Pacific Ocean and tropical Indian Ocean implied close linkages between moisture in the eastern Mongolian Plateau and remote oceans. When the SST related to the El Niño–Southern Oscillation was high (low), the intensity of the Indian summer monsoon at the northern extremities weakened (strengthened). Thus, moisture decreased (i.e., the relative humidity was low) in North China and in our study area. The low land-sea thermal contrast between Asia and the Indian Ocean due to the enhanced SSTs in the tropical Indian Ocean also influenced the strength of the moisture transfer via the Indian summer monsoon, thereby reducing the moisture variations in the eastern Mongolian Plateau.
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DOI：
10.1007/978-0-387-75692-9_9
发表时间：
2008
期刊：
--
影响因子：
--
作者：
D. Hinkley
通讯作者：
D. Hinkley
DOI：
10.1002/joc.1877
发表时间：
2010-01
期刊：
International Journal of Climatology
影响因子：
--
作者：
Hai Xu;Yetang Hong;B. Hong;Yongxuan Zhu;Yu Wang
通讯作者：
Hai Xu;Yetang Hong;B. Hong;Yongxuan Zhu;Yu Wang
影响因子：
3.8
作者：
S. Vicente‐Serrano;S. Beguerı́a;J. López‐Moreno;M. Angulo;A. Kenawy
通讯作者：
S. Vicente‐Serrano;S. Beguerı́a;J. López‐Moreno;M. Angulo;A. Kenawy
影响因子：
--
作者：
R. Lu
通讯作者：
R. Lu
DOI：
10.1073/pnas.0602447103
发表时间：
2006-08-29
影响因子：
11.1
作者：
Stenseth, Nils Chr.;Samia, Noelle I.;Chan, Kung-Sik
通讯作者：
Chan, Kung-Sik