CAJ | 학술논문

利用紫外-可见光谱与三维荧光光谱,结合拉格朗日混合单粒子轨道模型及火点图,研究了重庆2013年夏、冬两季雨水DOM光谱特征,并对其来源进行解析.结果表明,雨水DOM与水体、土壤DOM具有类似性质光谱特征,证明降雨DOM也是陆地及水环境中DOM地化特征的重要贡献者.雨水DOM中DOC含量为0.88~12.80 mg·L-1,CDOM含量在3.17~21.11 m-1之间,夏、冬两季降雨DOM差异明显(P﹤0.05).与夏季相比,冬季降雨DOM分子量较小,芳香性程度较低,腐殖化程度也更低,输入主要以本地和短距离输送为主；而夏季DOM来源较分散.尽管吸收和荧光光谱可用于解析雨水DOM组成和来源,但在光谱特征的解析和来源识别上与其他来源DOM有所区别,传统“内、外源区分”并不适用于雨水DOM.
이용자외-가견광보여삼유형광광보,결합랍격랑일혼합단입자궤도모형급화점도,연구료중경2013년하、동량계우수DOM광보특정,병대기래원진행해석.결과표명,우수DOM여수체、토양DOM구유유사성질광보특정,증명강우DOM야시륙지급수배경중DOM지화특정적중요공헌자.우수DOM중DOC함량위0.88~12.80 mg·L-1,CDOM함량재3.17~21.11 m-1지간,하、동량계강우DOM차이명현(P﹤0.05).여하계상비,동계강우DOM분자량교소,방향성정도교저,부식화정도야경저,수입주요이본지화단거리수송위주；이하계DOM래원교분산.진관흡수화형광광보가용우해석우수DOM조성화래원,단재광보특정적해석화래원식별상여기타래원DOM유소구별,전통“내、외원구분”병불괄용우우수DOM.
This study aimed at evaluating the variability of the optical properties including UV-Vis and fluorescence characteristics of dissolved organic matter ( DOM) from rainwater in summer and winter seasons. UV-Vis and fluorescence spectroscopy, together with Hybrid Single-Particle Lagrangian Integrated Trajectory ( HYSPLIT) model and fire events map, were conducted to characterize DOM and investigate its sources and contributions. The results showed that as compared with aquatic and soil DOM, rainwater DOM showed similar spectral characteristics, suggesting DOM in precipitation was also an important contributor to DOM pool in terrestrial and aquatic systems. The concentrations of DOC in rainwater were 0. 88-12. 80 mg·L-1 , and the CDOM concentrations were 3. 17-21. 11 mg·L-1 . Differences of DOM samples between summer and winter were significant ( P ﹤0. 05 ) . In comparison to summer, DOM samples in winter had lower molecular weight and aromaticity, and also lower humification. Input of DOM in winter was predominantly derived from local and short-distance distances, while non-special scattering sources were identified as the main contributors in summer. Although absorption and fluorescence spectroscopy could be used to identify DOM composition and sources, there were obvious differences in spectra and sources analysis between rainwater DOM and the others from other sources. Thus, the classic differentiation method by “allochthonous ( terrigenous ) and autochthonous ( authigenic )” is possibly too simple and arbitrary for characterization of DOM in rainwater.