| 重建古气温的环境证据-方法差异性分析 |
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| 引用本文： | 侯光良,鄂崇毅,肖景义,何青梅.重建古气温的环境证据-方法差异性分析[J].地球学报,2011,32(4):455-462. |
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| 作者姓名： | 侯光良 鄂崇毅 肖景义 何青梅 |
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| 作者单位： | 青海师范大学生命与地理科学学院; 青藏高原资源与环境教育部重点实验室;青海师范大学生命与地理科学学院; 青藏高原资源与环境教育部重点实验室;青海师范大学生命与地理科学学院; 青藏高原资源与环境教育部重点实验室;青海师范大学生命与地理科学学院 |
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| 基金项目： | 青海师范大学科技创新项目(编号: 10YJCZH041) |
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| 摘 要： | 重建过去气温是PAGES关注的焦点之一,由于环境证据类型与重建的方法不同,重建的古气温记录存在一定差异。环境证据类型中孢粉、植物硅酸体、综合证据、氧同位素、冰川-冰缘重建同一时段、同一地点的气温依次降低,孢粉与植物硅酸体指示的气温最为接近,综合证据与氧同位素较接近;这说明孢粉重建的气温数值偏高,冰川-冰缘证据偏低,它们分别主要指示了植物生长季节和冬半年或冷期的气温;而综合证据与氧同位素则可能比较接近实际气温。按照重建方法,转换函数法重建的全新世气温记录普遍高于自然地理因子指示法,而自然地理因子指示法重建的温度记录变化幅度更大(尤其是冷事件),说明因子指示法重建的气温记录对于百年尺度的极端事件记录更为灵敏。
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| 关 键 词： | 重建 古气温 环境证据 方法 |
The Sensitivity Analysis of Reconstructing Ancient Temperatures by Different Circumstantial Evidence and Methods |
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| HOU Guang-liang,E Chong-yi,XIAO Jing-yi and HE Qing-mei.The Sensitivity Analysis of Reconstructing Ancient Temperatures by Different Circumstantial Evidence and Methods[J].Acta Geoscientia Sinica,2011,32(4):455-462. |
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| Authors: | HOU Guang-liang E Chong-yi XIAO Jing-yi and HE Qing-mei |
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| Institution: | School of Life and Geographic Science, Qinghai Normal University; Key Laboratory of Qinghai-Tibet Plateau Department of Resource and Environment Education;School of Life and Geographic Science, Qinghai Normal University; Key Laboratory of Qinghai-Tibet Plateau Department of Resource and Environment Education;School of Life and Geographic Science, Qinghai Normal University; Key Laboratory of Qinghai-Tibet Plateau Department of Resource and Environment Education;School of Life and Geographic Science, Qinghai Normal University |
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| Abstract: | The reconstruction of ancient temperatures is one of the focuses to which PAGES pays close attention. Due to the difference between the type of circumstantial evidence and the method for reconstructing ancient temperatures, there exists certain differences between the records of reconstructing ancient temperatures. The temperatures from such types of circumstantial evidence as spore and pollen, phytolith, comprehensive evidence, oxygen isotope and glacier-periglacial decrease in turn at the same time and spot. The temperatures indicated by spore and pollen and phytolith are closest to each other, and those indicated by comprehensive evidence and oxygen isotope are relatively close to each other. These data suggest that the temperature numerical value reconstructed by spore and pollen is relatively high, and that of the evidence of glacier-periglacial is relatively low, which might mainly indicate the temperature of growing season of plants and that of half year of winter (cold period) respectively; by contrast, the comprehensive evidence and oxygen isotope temperature may be close to the actual temperature. According to the reconstruction method, the Holocene temperature record reconstructed by transfer function analysis is generally higher than that by the natural geographical factor indication method, while the variation range of the temperature record reconstructed by the natural geographical factor indication method is wider (especially the cold events), suggesting that the temperature record reconstructed by the factor indication method is more sensitive to the extreme event at the scale of one hundred years. |
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| Keywords: | reconstruction ancient temperature circumstantial evidence method |
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