Climatic response of Chinese pine and PDSI variability in the middle Taihang Mountains, north China since 1873
Climatic response of Chinese pine and PDSI variability in the middle Taihang Mountains, north China since 1873
复制标题
1873年以来华北太行山中段油松的气候响应与PDSI变化
DOI：
10.1007/s00468-012-0812-6
复制
发表时间：
2013-04-01
影响因子：
2.3
通讯作者：
Liu, Yu
中科院分区：
文献类型：
--
作者：
Cai, Qiufang;Liu, Yu
我们基于油松（Pinus tabulaeformis Carr）的年轮宽度，重建了1873年至2008年华北太行山地区的第一个帕尔默干旱严重程度指数（PDSI）。在校准期（1955 - 2005年），该重建结果能够解释仪器记录中43.2%的PDSI。20世纪之前，PDSI的变异性相对稳定。然而，在20世纪和21世纪初，它变得更具变异性和持续性。在1920 - 1931年、1973 - 1982年和1992 - 2001年发现了持续较长的干旱期，在1944 - 1965年和2004 - 2008年确定了湿润期。与20世纪20年代相比，20世纪70年代和90年代的干旱更为严重，20世纪90年代是太行山整个重建时期中最严重的干旱时期。自20世纪50年代以来呈下降趋势之后，PDSI在2000年后呈现上升趋势，表明研究区域近年来水分条件较好。我们的重建结果与附近的干湿指数以及其他基于树木年轮的PDSI重建结果进行比较，在干旱（湿润）期显示出高度一致性，表明采样点周围具有相似的干湿状况，这也通过空间相关性分析得到了进一步证明。该重建结果还与东亚夏季风（EASM）指数高度相关，这表明重建的PDSI可用于指示东亚夏季风的强度。频谱分析显示在2.05、2.07、2.65、3.75、10和60年处有显著峰值，这意味着较大的环流系统（如ENSO、PDO和NAO）以及太阳活动对当地气候的影响。
We reconstructed the first Palmer Drought Severity Index (PDSI) in the Taihang Mountains, north China from 1873 to 2008, based on ring width of the Chinese Pine (Pinus tabulaeformis Carr). The reconstruction can explain 43.2 % of the PDSI from instrument record during the calibration period (1955-2005). The PDSI variability was relatively stable before the twentieth century. However, it became more variable and persistent during the twentieth and early twenty-first century. Persistent long dry intervals were found in 1920-1931, 1973-1982 and 1992-2001, and the wet intervals were identified in 1944-1965 and 2004-2008. Comparing with the 1920s, the dryness of the 1970s and 1990s were more intense and the 1990s ranked the most severe drought for the whole reconstructed period in the Taihang Mountains. After a decreasing trend since the 1950s, the PDSI shows increasing tendency after 2000, demonstrating a better moisture condition in recent years in the studied area. Comparisons of our reconstruction with nearby dry/wet index and other tree-ring-based PDSI reconstruction showed high consistency in dry (wet) periods, showing similar dry-wet regimes around the sampled site, which was also further proved by the spatial correlation analysis. This reconstruction is also highly correlated with the East Asian Summer Monsoon (EASM) index, suggesting the reconstructed PDSI could be used to indicate the strength of EASM. Spectral analysis revealed significant peaks at 2.05, 2.07, 2.65, 3.75, 10 and 60 years, implying the influence of larger circulation system (such as ENSO, PDO and NAO) and solar activity on local climate.