夏季长江口无机氮的加入与转移偏移理论稀释曲线的解释

王奎; 陈建芳; 徐杰; 金明明; 金海燕; 李宏亮; 高生泉; 卢勇; 黄大吉

夏季长江口无机氮的加入与转移偏移理论稀释曲线的解释

1.
国家海洋局第二海洋研究所海洋生态系统与生物地球化学国家海洋局重点实验室,浙江杭州 310012;浙江大学地球科学系,浙江杭州310012
2.
国家海洋局第二海洋研究所海洋生态系统与生物地球化学国家海洋局重点实验室,浙江杭州 310012
3.
香港科技大学环境学部,香港九龙

基金项目: 国家重点基础研究发展计划(2006CB400603);国家近海海洋综合调查与评价(908)专项(908-01-ST04;908-01-BC06);国家海洋局第二海洋研究所基本科研业务费专项资助(JG0723;JT0707);国家海洋局青年海洋科学基金(2009515)。

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出版历程
- 收稿日期: 2009-09-27

The relationship between dissolved inorganic nitrogen and fresh-saline water mixing during summer in the Changjiang Estuary and the adjacent East China Sea

1.
Laboratory of State Oceanic Administration for Marine Ecological System and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012,China;Department of Geoscience, Zhejiang Vniversity, Hangzhou 310012, China
2.
Laboratory of State Oceanic Administration for Marine Ecological System and Biogeochemistry, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012,China
3.
Atmospheric, Marine and Coastal Environmental Program, Hong Kong University of Scicence and Technology, Hong Kong

摘要

摘要: 利用2006年夏季长江口调查数据分析了长江口海域硝酸盐(NO^-₃)、亚硝酸盐(NO^-₂)、铵盐(NH⁺₄)大面分布,NO^-₃浓度呈近岸高、外海低的特征,NO^-₂和NH⁺₄浓度在上海市排污口位置有高值区并向外扩散。NO^-₃,NH⁺₄浓度总体上符合咸淡水混合之稀释效应,与盐度的相关系数(r²)分别为0.815,0.255,呈保守行为,而NO^-₂浓度与盐度的相关性系数为0.074,呈非保守行为。在确定了淡水端元和咸水端元的基础上,做出理论稀释曲线TDL (theoretical dilution line),由于上海市污染物的输入,淡水端元NO^-₃,NO^-₂,NH⁺₄浓度不同程度地正偏于TDL,在外海深层水范围内有机颗粒矿化再生亦呈加入态势。对应高溶解氧的盐度羽状峰处,由于真光层初级生产较强,表层NO^-₃浓度负偏于TDL约1~19 μmol/dm³,NO^-₂,NH⁺₄浓度也存在不同程度的减小。在长江口最大浑浊带附近,由于高浓度悬浮物吸附NH⁺₄而呈现明显的迁出机制。外海表层海水三氮营养盐浓度数据点偏离TDL程度较小,但在底层由于来自上层的有机颗粒耗氧分解而再生出营养盐,使NO^-₃,NO^-₂,NH⁺₄浓度数据一般在TDL之上。
- 长江口 /
- 硝酸盐 /
- 亚硝酸盐 /
- 铵盐 /
- 理论稀释
Abstract: The spatial variations in nitrate (NO^-₃), nitrite (NO^-₂) and ammonium (NH⁺₄) concentrations in the Changjiang Estuary and the adjacent East China Sea were described on the basis of the summer cruise in 2006. NO^-₃ concentrations decreased along a salinity gradient. Owing to the input of the sewage from Shanghai City NO^-₂ and NH^-₄ concentrations were very high (up to 8.64, 19.81 μmol/dm³ respectively) in the Changjiang Estuaxy area and decreased seaward. Generally NO^-₃ and NH⁺₄ concentrations were significantly correlated with salinity, with the coefficient (r²) of 0.815 and 0.255 respectively, suggesting that these two nutrients behaved nearly conservatively, while NO^-₂ did not behave conservatively (r²=0.074). Theoretical dilution line (TDL) was obtained by assuming river and ocean end-members. NO^-₃, NO^-₂ and NH⁺₄ concentrations were above values expected for a conservative mixing relationship with salinity at the freshwater end member due to high nitrogen input from the sewage effluence, and in deep water at the oceanic stations because of the decomposition of the organic matter. In contrast, at the salinity plume with high dissolved oxygen (DO) concentrations, the surface NO^-₃ concentrations were below values expected for the conservative mixing by 1~19 mol/dm³, as a result of high primary production in the euphotic zone, where NO^-₂ and NH⁺₄ concentrations were also negatively deviated to various extents. In waters with the highest turbidity in the Changjiang Estuary, NH⁺₄ was removed due to the adsorption of suspended matter. Overall, NO^-₃, NO^-₂ and NH⁺₄ concentrations at the surface at the oceanic stations deviated from the TDL to less extent, while their concentrations at the bottom were generally beyond values expected for the TDL because the organic matter from the photic zone decomposed and nutrients regenerated.
- Changjiang Estuary /
- nitrate /
- nitrite /
- ammonium /
- theoretical dilution line

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