Little Ice Age climate changes in Southwest China from a stalagmite delta O-18 record
Little Ice Age climate changes in Southwest China from a stalagmite delta O-18 record
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从石笋三角洲O-18记录看中国西南小冰期气候变化
DOI：
10.1016/j.palaeo.2020.110167
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Yu Tsai-Luen
中科院分区：
文献类型：
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作者：
Li Ting-Yong;Xiao Si-Ya;Shen Chuan-Chou;Zhang Jian;Chen Chao-Jun;Cheng Hai;Spoetl Christoph;Huang Ran;Wang Tao;Li Jun-Yun;Wu Yao;Liu Zi-Qi;Edwards R. Lawrence;Yu Tsai-Luen
小冰期（LIA）气候变化的特点是全球范围内广泛的，但时空不连贯的冷却与高区域变率。然而，LIA的发生，终止，内部结构和潜在的强迫机制仍然不清楚。本文报道了中国西南石将军洞石笋的U-Th年龄记录，其平均采样分辨率为0.8年，平均年龄不确定度小于4年。我们的特点是亚洲夏季风（ASM）的动力学在几十年到百年的时间尺度在LIA在前所未有的准确性和精度。LIA的开始发生在大约1300（A.D.）在1340-1380、1445-1480、1520-1540、1600-1630、1650-1670和1695-1730（A.D.）分别中国季风区的气候变率与西北季风区的气候变率总体上不一致。在LIA的最冷时期（即1500 CE之后），中国西南部表现出寒冷和干燥的格局，而中国西北部则经历了寒冷和潮湿的气候。此外，我们从亚洲-澳大利亚季风（AAM）地区的记录表明，连贯的变化在LIA，反对半球间的“跷跷板”模型的年代际百年的时间尺度。记录的太阳极小，较低的北方半球的温度，以及PDO和ENSO在LIA期间的正相位削弱了亚洲-澳大利亚夏季风，减少了整个AAM地区的降水。
Climate change during the Little Ice Age (LIA) was characterized by globally widespread but spatiotemporally incoherent cooling with high regional variability. However, the onset, termination, internal structure, and underlying forcing mechanisms of the LIA remain unclear. Here we present a U-Th-dated stalagmite record with an average sampling resolution of 0.8 years and mean age uncertainty less than 4 years from Shijiangjun Cave, Southwest China (SW China). We have characterized the dynamics of the Asian summer monsoon (ASM) on interdecadal to centennial timescales during the LIA at unprecedented accuracy and precision. The onset of the LIA occurred at about 1300 (A.D.) and six weak-ASM events were identified at 1340–1380, 1445–1480, 1520–1540, 1600–1630, 1650–1670, and 1695–1730 (A.D.), respectively. The overall climate variability in Chinese monsoon regions is inconsistent with that in Northwest China (NW China). During the coldest period of the LIA (i.e. after 1500 CE), SW China exhibited a cold and dry pattern, while NW China experienced a cold and wet climate. Moreover, our records from the Asian-Australian monsoon (AAM) region showed coherent changes during the LIA, arguing against the interhemispheric “see-saw” model on interdecadal-centennial timescales. Documented solar minima, lower Northern Hemisphere temperature, and positive phases of PDO and ENSO during the LIA weakened the Asian-Australian summer monsoon, decreasing precipitation throughout the AAM regions.