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Spectroscopic investigation of hydrogen and triple-oxygen isotopes in atmospheric water vapor and precipitation during Indian monsoon season
Isotopes in Environmental and Health Studies ( IF 1.3 ) Pub Date : 2021-06-03 , DOI: 10.1080/10256016.2021.1931169
Sayoni Bhattacharya 1 , Mithun Pal 2 , Biswajit Panda 2 , Manik Pradhan 1, 2
Affiliation  

ABSTRACT

Water vapor, the most important greenhouse gas in the atmosphere, has four natural stable isotopologues (H216O, H217O, H218O and HD16O), and their isotopic compositions can be used as hydrological tracers. But the underlying processes and pattern-dynamics of the isotopic compositions of atmospheric water vapor and precipitation in response to various meteorological conditions during monsoon season in a tropical hot and humid region is poorly understood. Here, we present results of H and triple-O-isotopes of water in precipitation and atmospheric water vapor during monsoon season exploiting high-resolution integrated cavity output spectroscopy technique. We observed a distinct temporal variation of the isotopic compositions of water at different phases of the monsoon. The diurnal patterns of the isotopic variations were influenced by the local meteorological factors such as temperature, relative humidity and amount of precipitation. We also investigated the monsoonal dynamics of the second-order isotopic parameters, so-called d-excess and 17O-excess along with the influence of local meteorological factors on isotopic variations to improve our understanding of the underlying isotopic fractionation processes. Consequently, our results provide a unique isotopic-fingerprint dataset of rainwater and atmospheric water vapor for a tropical region and thus shed a new light on hydrological and meteorological processes in the atmosphere.



中文翻译:

印度季风季节大气水汽和降水中氢和三氧同位素的光谱研究

摘要

水蒸气是大气中最重要的温室气体,具有四种天然稳定同位素(H 2 16 O、H 2 17 O、H 2 18 O 和 HD 16O),它们的同位素组成可用作水文示踪剂。但是,对于热带湿热地区季风季节各种气象条件响应的大气水汽和降水同位素组成的潜在过程和模式动力学知之甚少。在这里,我们利用高分辨率集成腔输出光谱技术展示了季风季节降水和大气水蒸气中水的 H 和三重 O 同位素的结果。我们观察到季风不同阶段水的同位素组成存在明显的时间变化。同位素变化的日变化规律受当地气温、相对湿度和降水量等气象因素的影响。d - 过量和17 O - 过量以及当地气象因素对同位素变化的影响,以提高我们对潜在同位素分馏过程的理解。因此,我们的结果提供了热带地区雨水和大气水蒸气的独特同位素指纹数据集,从而为大气中的水文和气象过程提供了新的思路。

更新日期:2021-07-20
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