【摘要】：溶解有機物(DOM)經(jīng)太陽光照射導(dǎo)致其吸光度(光漂白)和溶解有機碳(光礦化)損失,從而影響水體生態(tài)系統(tǒng)光學(xué)特性及碳循環(huán)。本文通過測定冬季長江口及其鄰近海域DOM光降解表觀量子產(chǎn)率(AQY),初步探討了DOM光反應(yīng)活性在河口及陸架海的變化特征。DOM光降解AQY由口內(nèi)至口外逐漸遞減,且有色溶解有機物(CDOM)光漂白速率是溶解有機碳(DOC)光礦化速率的10倍。Φble(CDOM光漂白表觀量子產(chǎn)率)和Φmin(DOC光礦化平均量子產(chǎn)率)在最大渾濁帶以東海域與鹽度和SUVA254分別呈顯著的線性負相關(guān)與正相關(guān),表明DOM光反應(yīng)活性在長江口外受物理混合影響為主,且陸源DOM光反應(yīng)活性比海源高。此外,最大渾濁帶下游DOM光降解AQY顯著低于上游。DOM光降解速率隨波長的變化呈現(xiàn)非高斯分布,且峰值出現(xiàn)在330nm,積分結(jié)果表明UVA是DOM光降解的主要貢獻者。本研究結(jié)果將為完善我國東海碳通量模型提供幫助。
[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.
【作者單位】： 天津科技大學(xué)海洋與環(huán)境學(xué)院;加拿大魁北克大學(xué)里姆斯基分校海洋科學(xué)研究所;
【基金】：國家自然科學(xué)基金——海洋中無色溶解有機物的光敏及生物降解的研究(41376081) 國家重大科學(xué)研究計劃973計劃子課題——陸海間碳循環(huán)關(guān)鍵生物地球化學(xué)過程及機理研究(2013CB956601)
【分類號】：P734

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本文編號：2413369