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| 1 | Optical properties of estuarine dissolved organic matter isolated using cross-flow ultrafiltration显示文摘Dissolved organic matter(DOM) from freshwater, mid-salinity, and seawater endmember samples in the Jiulong River Estuary, China were fractionated using cross-flow ultrafiltration with a 10-kDa membrane. The colloidal organic matter(COM; 10 kDa–0.22 μm) retentate, low molecular weight(LMW) DOM(<10 kDa) permeate, and bulk samples were analyzed using absorption spectroscopy and three-dimensional fluorescence excitation-emission-matrix spectroscopy. The UV-visible spectra of COM were very similar to those obtained for permeate and bulk samples, decreasing monotonically with increasing wavelength. Most of the chromophoric DOM(CDOM, expressed as the absorption coefficient a355) occurred in the LMW fraction, while the percentage of CDOM in the colloidal fraction was substantially higher in the freshwater endmember(13.4% of the total) than in the seawater endmember(6.8%). The bulk CDOM showed a conservative mixing behavior in the estuary, while there was removal of the COM fraction and a concurrent addition of the permeate fraction in the mid-salinity sample, implying that part of the colloidal CDOM was transformed into LMW CDOM. Two humic-like components(C1: <250, 325/402 nm; and C2: 265, 360/458 nm) and one protein-like component(C3: 275/334 nm) were identified using parallel factor analysis. The contributions of the C1, C2, and C3 components of the COM fraction to the bulk sample were 2.5%–8.7%, 4.8%–12.6%, and 7.4%–14.7%, respectively, revealing that fluorescent DOM occurred mainly in the LMW fraction in the Jiulong River Estuary. The C1 and C2 components in the retentate and permeate samples showed conservative mixing behavior, but the intensity ratio of C2/C1 was higher in the retentate than in the permeate fractions for all salinity samples, showing that the humic component was more enriched in the COM than the fulvic component. The intensity ratio of C3/(C1+C2) was much higher in the retentate than in the permeate fraction for mid-salinity and seawater samples, revealing that the protein-like component was relatively more enriched in COM than the humic-like component. The contribution of the protein-like component(C3) to the total fluorescence in the retentate increased from 14% in the freshwater endmember to 72% for the seawater endmember samples, clearly indicating the variation of dominance by the humic-like component compared to the protein-like component during the estuarine mixing process of COM. | YI Yueyuan ZHENG Airong GUO Weidong YANG Liyang CHEN Ding | 2014 | Acta Oceanologica Sinica2014，33，4： | 6 |
| 2 | 中国近海黄色物质吸收光谱经验斜率特征研究显示文摘黄色物质是中国近海水体光学特性的重要影响因素.基于在中国近海海洋光学调查中获取的895 个站位的黄色物质吸收系数数据, 对黄色物质吸收光谱经验斜率(Sg)进行了分析, 研究表明: 1. 中国近海Sg 的范围在0.0066~0.0284nm^–1 之间, 在大部分研究海区Sg 呈现正态分布趋势, 全海区Sg 均值为0.0142nm^–1, 标准差为0.0044nm^–1; 2. 中国近海黄色物质组分受陆源和海源共同影响, 不同海区Sg 表现出一定的差异; 3. Sg 与ag(440)仅在两个海域表现出一定的弱负相关性, 在其他绝大部分中国近海海域, 两者的相关性较弱. | 周虹丽 朱建华 李铜基 | 2015 | 热带海洋学报2015，34，1： | 4 |
| 3 | 中国近海水体三要素吸收系数的比例分布特征研究显示文摘中国近海是典型的二类水体,水色三要素组成复杂,水色三要素是影响中国近海水体光学特性的重要因素。基于2006-2007年在中国近海进行的现场调查,获取了1 012个站位的三要素吸收系数数据,对三要素吸收系数的比例分布特征进行了分析。结果表明:在近岸海区二类水体区域,非色素颗粒占主导,在渤海海区所占比例高达57%;在远洋海区,浮游植物和CDOM占主导,两者共同决定了远洋水体的光学性质,叶绿素和CDOM所占比例高达90%以上;中国近海三要素吸收系数的比例分布,占主导作用的是黄色物质和非色素颗粒物,所占比例分别为36%和34%;浮游植物色素所占比例为27%。 | 周虹丽 朱建华 李铜基 | 2014 | 海洋技术2014，33，5： | 2 |
| 4 | 海水黄色物质吸收系数测量中的关键问题探讨显示文摘黄色物质是海洋中的有色可溶性有机物,是重要的水质参数之一。目前实验室黄色物质样品测量技术虽已有标准参考,但测量过程的一些重要变量对测量结果的定量影响仍未明确。基于2016年东印度洋南部水体综合调查所得的实测样品,分析了参比纯水是否过滤和过滤压力等因素对测量结果准确性的具体影响,发现:(1)参比纯水未过滤会使测量结果明显高估,ag(350)和ag(440)的高估程度分别为0.137 m^(-1)和0.114 m^(-1);(2)过滤压力的不同对测量结果影响较为明显,过滤压力越大,测得的吸收系数越大,对于a_g(350),150 mm Hg相对100 mm Hg的平均偏差为0.195 m^(-1),200 mm Hg相对150 mm Hg的平均偏差为0.058 m^(-1);对于ag(440),150 mm Hg相对100mm Hg的平均偏差为0.168 m^(-1),200 mm Hg相对150 mm Hg的平均偏差为0.064 m^(-1)。本文的实验研究可促进实验者对规范中黄色物质样品处理过程以及相关参数设置原因和意义的理解。 | 蔡晓晴 汪小勇 孟洁 周庆伟 毕大勇 张榕 吴国伟 | 2017 | 海洋技术学报2017，36，5： | 0 |
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