Growing-season precipitation since 1872 in the coastal area of subtropical southeast China reconstructed from tree rings and its relationship with the East Asian summer monsoon system
Growing-season precipitation since 1872 in the coastal area of subtropical southeast China reconstructed from tree rings and its relationship with the East Asian summer monsoon system
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DOI：
10.1016/j.ecolind.2017.07.012
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发表时间：
2017-11
影响因子：
6.9
通讯作者：
Qiufang Cai;Yu Liu;Han Liu;Changfeng Sun;Yanchao Wang
中科院分区：
文献类型：
--
作者：
Qiufang Cai;Yu Liu;Han Liu;Changfeng Sun;Yanchao Wang
世界温带树木年轮提供了丰富的古生态和古水文气候信息。然而，从亚热带到热带地区的树木年轮仍然相对稀少，这极大地限制了我们对气候变化问题的全面了解。本文利用福建省马尾松的年轮宽度（TRW）数据，对1854 - 2012年的马尾松年轮宽度进行了交叉定年，建立了1854 - 2012年的马尾松年轮宽度年表。树木年轮与4 - 11月总降水量呈显著正相关（r= 0.71，p <0.01）。重建的4 - 11月降水表现出两个相对潮湿（1876-1886年和1957-1962年）和一个相对干燥（1986-2004年）的时期。自1959年以来出现了明显的干燥趋势，1993年后有所缓解。重建过程中出现的极端少雨年大多得到历史资料的支持。空间相关模式显示，我们重建的降水量与中国东南沿海沿着其他水文气候记录也是一致的，证明了其捕捉中国东南地区（主要指长江中下游以南地区）大尺度水文信号的能力。重建的降水量与东亚夏季风指数有显著的相关性。此外，在年代际尺度上，东亚夏季风的强度与华北季风降水的变化存在同步性，表明这两个地区的生长季降水变化都受到东亚夏季风强度的影响。这项工作突出了利用树木年轮宽度重建中国东南亚热带地区降水的潜力，而该地区降水变化的相关问题远未解决。
Tree rings from temperate zones of the world have provided abundant palaeo- ecological and paleo-hydroclimatic information. However, tree rings from subtropical to tropical regions remain relatively scarce, which greatly limit our fully understanding about the climate change issues. In the present work, tree-ring-width (TRW) measurements of Masson pine from Fujian province, the coastal area of subtropical southeast China were successfully crossdated and a TRW STD chronology was developed from 1854 to 2012. Significantly positive correlation was identified between the tree rings and April–November total precipitation (r= 0.71,p <0.01). The reconstructed April–November precipitation exhibited two comparatively wet (1876–1886 and 1957–1962) and one comparatively dry (1986–2004) periods. An evident drying trend since 1959 was seen and it was mitigated after 1993. Most of the extreme low-precipitation years in the reconstruction were supported by the historical records. As revealed by the spatial correlation patterns, our precipitation reconstruction was also consistent with other hydroclimatic records along the coastal areas of southeast China, proving its ability to capture the large-scale hydrological signal in southeast China (mainly refers to the south of the middle-lower reaches of Yangtze River). The reconstructed precipitation showed significant correlation with the East Asian summer Monsoon (EASM) index. Moreover, it also indicated simultaneous variation with the monsoon precipitation in North China on a decadal scale, implying that growing season precipitation variations in both regions were influenced by the EASM strength. This work highlights the potential of using tree-ring width to reconstruct precipitation in subtropical southeast China, while the relevant issues about precipitation variation in this region is far from resolved.