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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Intra-annual oxygen isotope variations in central Indian teak cellulose: possibility of improved resolution for past monsoon reconstruction.
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Intra-annual oxygen isotope variations in central Indian teak cellulose: possibility of improved resolution for past monsoon reconstruction.

机译：印度中部柚木纤维素中的年度氧同位素变化：过去季风重建的分辨率提高的可能性。

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摘要

A clear seasonal cycle has been detected in the intra-annual oxygen isotope variations ( delta 18O) of cellulose from several annual growth rings of teak trees that grew in central India. This persistent cycle is marked by higher delta 18O values at the ring boundaries and lower delta 18O values at intermediate parts. The amplitude of this seasonal cycle varies up to 6.8 per mil. Based on the pattern of teak growth reported in the literature and a plant physiological model that interprets the delta 18O of plant cellulose, it seems possible to identify subsections of a ring that formed during pre-monsoon, peak-monsoon and post-monsoon. Comparison of the delta 18O profile of a ring (year AD 1971), analysed with the highest resolution, and a model profile based on concurrent local meteorological data indicates the possibility of achieving a ~20 day resolution in monsoon reconstruction by intra-annual delta 18O measurements.
机译：在印度中部生长的几棵柚木年轮中，纤维素的年度氧同位素变化（delta 18 O）已检测到明显的季节性周期。此持久性循环的特征是在环边界处的增量delta 18 O值较高，而在中间部位的delta 18 O值较低。这个季节性周期的幅度变化高达6.8 / mil。根据文献报道的柚木生长模式和解释植物纤维素δ 18 O的植物生理模型，似乎有可能鉴定出季风前，高峰期形成的环的各个部分。 -季风和季风后。比较以最高分辨率分析的环（公元1971年）的δ 18 O剖面，以及基于并发本地气象数据的模型剖面，表明有可能在约20天内实现分辨率年内三角洲 18 O测量的季风重建。

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