亚洲树轮稳定氧同位素研究进展

发布时间：2018-04-19 00:14

本文选题：树木年轮 + 稳定氧同位素　；参考：《冰川冻土》2017年02期

【摘要】：树轮稳定氧同位素作为一种高精度的古气候代用指标,在亚洲地区的发展起步晚进步快。树轮稳定氧同位素比率(δ~(18)O)对区域气候信息有较强的记录能力,且与水汽循环关系密切,对于理解复杂的亚洲气候起着重要作用。亚洲地区树轮δ~(18)O对温度的响应主要出现在高纬度地区,中低纬度树轮δ~(18)O主要记录与水分(降水、相对湿度、PDSI等)有关的信号。对亚洲地区已发表的树轮δ~(18)O与气候要素(温度、降水、相对湿度)的相关分析显著性统计显示,生长季气候对树轮δ~(18)O至关重要,树轮δ~(18)O与温度的显著相关关系呈正相关,与降水和相对湿度的呈负相关,温度和降水通过降水δ~(18)O影响树轮δ~(18)O,但各自的信号强度存在区域差异,而相对湿度信号则广泛记录在不同区域不同树种之中。亚洲树轮稳定氧同位素研究集中于中低纬度地区,因而对大气水文循环的响应主要侧重于对亚洲夏季风和ENSO的研究,对季风降水的记录反映了季风活动的变化特征以及与之有关的环流信息;季节分辨率的树轮稳定氧同位素研究限于低纬热带亚热带区域,但对于理解区域气候和季风活动的年内变化、挖掘年轮不清晰树种的树轮学研究潜力具有重要的意义。
[Abstract]:As a high precision paleoclimate index, tree-ring stable oxygen isotope has developed rapidly in Asia.The stable oxygen isotope ratio (未 ~ (18) O) of tree rings has a strong ability to record regional climate information and is closely related to the water vapor cycle, which plays an important role in understanding the complex Asian climate.In Asia, the response of tree ring 未 ~ (18) O to temperature mainly occurs in high latitudes, while in middle and low latitudes, 未 ~ (18) O mainly records the signals related to water (precipitation, relative humidity, PDSI, etc.).The significant analysis of the correlation between the climatic elements (temperature, precipitation, relative humidity) and tree ring 未 ~ (18) O published in Asia shows that climate is very important to tree ring 未 ~ (18) O in growing season, and there is a positive correlation between 未 ~ (18) ~ (18) O and temperature in tree ring.There is a negative correlation between temperature and relative humidity. Temperature and precipitation influence tree ring 未 ~ (18) O through precipitation 未 ~ (18) O, but there are regional differences in their signal intensity, while the relative humidity signal is widely recorded in different tree species in different regions.The stable oxygen isotopic studies of Asian tree rings are concentrated in the middle and low latitudes, so the response to the atmospheric hydrological cycle is mainly focused on the study of the Asian summer monsoon and ENSO.The records of monsoon precipitation reflect the characteristics of the monsoon activity and the circulation information associated with it. The seasonal resolution tree-ring stable oxygen isotope study is limited to the low-latitude tropical subtropical region.However, it is of great significance to understand the annual changes of regional climate and monsoon activities and to tap the tree-ring potential of tree rings with unclear tree species.
【作者单位】：兰州大学资源环境学院西部环境教育部重点实验室;
【基金】：教育部博士点基金项目(20120211110041) 国家自然科学基金项目(41475067) 兰州大学开放基金项目(lzujbky-2013-bt01)资助
【分类号】：P532;Q948

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