长江口溶解有机物光漂白和光矿化表观量子产率
发布时间：2019-01-22 16:08
【摘要】：溶解有机物(DOM)经太阳光照射导致其吸光度(光漂白)和溶解有机碳(光矿化)损失,从而影响水体生态系统光学特性及碳循环。本文通过测定冬季长江口及其邻近海域DOM光降解表观量子产率(AQY),初步探讨了DOM光反应活性在河口及陆架海的变化特征。DOM光降解AQY由口内至口外逐渐递减,且有色溶解有机物(CDOM)光漂白速率是溶解有机碳(DOC)光矿化速率的10倍。Φble(CDOM光漂白表观量子产率)和Φmin(DOC光矿化平均量子产率)在最大浑浊带以东海域与盐度和SUVA254分别呈显著的线性负相关与正相关,表明DOM光反应活性在长江口外受物理混合影响为主,且陆源DOM光反应活性比海源高。此外,最大浑浊带下游DOM光降解AQY显著低于上游。DOM光降解速率随波长的变化呈现非高斯分布,且峰值出现在330nm,积分结果表明UVA是DOM光降解的主要贡献者。本研究结果将为完善我国东海碳通量模型提供帮助。
[Abstract]:The loss of absorbance (photobleaching) and dissolved organic carbon (light mineralization) of dissolved organic matter (DOM) caused by solar irradiation will affect the optical properties and carbon cycle of water body ecosystem. By measuring the apparent quantum yield (AQY),) of DOM photodegradation in the Yangtze Estuary and its adjacent waters in winter, the characteristics of DOM photoreaction activity in estuaries and shelf seas were preliminarily studied. The DOM photodegradation AQY decreased gradually from inside mouth to outside mouth. The photobleaching rate of colored dissolved organic matter (CDOM) is 10 times higher than that of dissolved organic carbon (DOC). The apparent quantum yield of 桅 ble (CDOM photobleaching and the average quantum yield of 桅 min (DOC photomineralization are in the East China Sea in the largest turbid zone. There were significant linear negative correlation and positive correlation between domain and salinity and SUVA254, respectively. The results show that the photoactivity of DOM is mainly affected by physical mixing outside the Changjiang Estuary, and the photoactivity of terrestrial DOM is higher than that of sea source. In addition, the photodegradation of AQY in the downstream of the maximum turbidity zone was significantly lower than that in the upstream. The photodegradation rate of DOM showed a non-Gao Si distribution with wavelength variation, and the peak value appeared at 330 nm. The integral results showed that UVA was the main contributor to the photodegradation of DOM. The results of this study will be helpful to improve the carbon flux model in the East China Sea.
【作者单位】： 天津科技大学海洋与环境学院;加拿大魁北克大学里姆斯基分校海洋科学研究所;
【基金】：国家自然科学基金——海洋中无色溶解有机物的光敏及生物降解的研究(41376081) 国家重大科学研究计划973计划子课题——陆海间碳循环关键生物地球化学过程及机理研究(2013CB956601)
【分类号】：P734
[Abstract]:The loss of absorbance (photobleaching) and dissolved organic carbon (light mineralization) of dissolved organic matter (DOM) caused by solar irradiation will affect the optical properties and carbon cycle of water body ecosystem. By measuring the apparent quantum yield (AQY),) of DOM photodegradation in the Yangtze Estuary and its adjacent waters in winter, the characteristics of DOM photoreaction activity in estuaries and shelf seas were preliminarily studied. The DOM photodegradation AQY decreased gradually from inside mouth to outside mouth. The photobleaching rate of colored dissolved organic matter (CDOM) is 10 times higher than that of dissolved organic carbon (DOC). The apparent quantum yield of 桅 ble (CDOM photobleaching and the average quantum yield of 桅 min (DOC photomineralization are in the East China Sea in the largest turbid zone. There were significant linear negative correlation and positive correlation between domain and salinity and SUVA254, respectively. The results show that the photoactivity of DOM is mainly affected by physical mixing outside the Changjiang Estuary, and the photoactivity of terrestrial DOM is higher than that of sea source. In addition, the photodegradation of AQY in the downstream of the maximum turbidity zone was significantly lower than that in the upstream. The photodegradation rate of DOM showed a non-Gao Si distribution with wavelength variation, and the peak value appeared at 330 nm. The integral results showed that UVA was the main contributor to the photodegradation of DOM. The results of this study will be helpful to improve the carbon flux model in the East China Sea.
【作者单位】： 天津科技大学海洋与环境学院;加拿大魁北克大学里姆斯基分校海洋科学研究所;
【基金】：国家自然科学基金——海洋中无色溶解有机物的光敏及生物降解的研究(41376081) 国家重大科学研究计划973计划子课题——陆海间碳循环关键生物地球化学过程及机理研究(2013CB956601)
【分类号】：P734
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