中文摘要：

利用紫外-可见吸收光谱（UV—Vis）和荧光激发-发射矩阵光谱（EEMs）技术研究了广州市番禺区大学城雨水中溶解有机质（DOM）的吸收和荧光等光谱特性．结果表明：不同气候特征的雨水DOM的吸收光谱随波长增加呈指数衰减，UV—Vis光谱的斜率指数S的变化表明不同季节DOM的相对分子量不同：夏季DOM平均相对分子量较高，而春季和冬季DOM相对分子量相对较低．雨水中DOM的EEMs光谱表明样品中存在3个类腐殖质峰：紫外类腐殖质峰A、海洋类腐殖质峰M和类蛋白（色氨酸）峰T，其中紫外类腐殖质峰A在雨水DOM中占主导作用．另外腐殖化指数（HIX）表明冬季雨水样品的腐殖化程度较高．

英文摘要：

The dissolved organic matter （DOM） in rainwater were collected from universities town of Guangzhou and were characterized with UV-Vis absorbance and three-dimensional excitation-emission matrix （EEM） fluorescence spectroscopies. The results shown that the UV-Vis absorbance spectra exhibited similar characteristics, which was exponential attenuation with the increasing wavelength. The spectral slope coefficient （S） of UV - visible spectra indicated relative higher molecular weight in summer than that in spring and winter. Three fluorophores were identified in the EEM fluorescence spectra of DOM： The UV humic-like peak A, the marine humic-like peak M and the protein-like peak （tryptophan） T, and the humic-like peak A was the dominant component in the rain DOM in Guangzhou. Humification index （HIX） suggested that the rain DOMs in winter were characterized with relatively high humification degree.