Enhanced Ammonia Oxidation Caused by Lateral Kuroshio Intrusion in the Boundary Zone of the Northern South China Sea
Enhanced Ammonia Oxidation Caused by Lateral Kuroshio Intrusion in the Boundary Zone of the Northern South China Sea
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南海北部边界区黑潮横向侵入导致氨氧化加剧
DOI：
10.1029/2018gl077896
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发表时间：
2018-07
影响因子：
5.2
通讯作者：
Kao Shuh-Ji
中科院分区：
文献类型：
--
作者：
Xu Min Nina;Zhang Weijie;Zhu Yifan;Liu Li;Zheng Zhenzhen;Wan Xianhui Sean;Qian Wei;Dai Minhan;Gan Jianping;Hutchins David A.;Kao Shuh-Ji
溶解有机物的横向输入可能对贫营养海洋的生产力起着重要的支持作用，但相关的生物地球化学证据在该领域还缺乏。氨氧化（AO），硝化的第一步，桥梁有机矿化和硝酸盐，是潜在的即时响应。利用~（15）N-NH ~（4+）研究了黑潮频繁侵入的南海北方海域AO的空间分布。AO在空间上的变化范围很广（0.001 ~ 134 nmol · L−1 · day−1），深度积分（200 m）AO在黑潮影响中等的地方达到峰值，表明由于横向混合，AO增强。由于贫营养黑潮具有高溶解有机氮（DON）的特征，这种横向混合不仅将外部DON引入南海北方，而且还增强了NH 4+的再生和随后的氧化，使具有DON梯度的边界区的常规新生产复杂化。
Lateral input of dissolved organics may play a significant role to support productivity in oligotrophic ocean although associated biogeochemical evidences are lacking in the field. Ammonia oxidation (AO), the first step of nitrification that bridges organic remineralization and nitrate, is potentially an immediate responder. By using 15N‐NH4+, the spatial distribution of AO was investigated in the northern South China Sea, where Kuroshio Current intrudes frequently. AO ranged widely (0.001 to 134 nmol · L−1 · day−1) in space and the depth‐integrated (200 m) AO peaked where the Kuroshio influence is moderate suggesting that enhanced AO had occurred due to lateral mixing. Since oligotrophic Kuroshio is characterized by high dissolved organic nitrogen (DON), such lateral mixing not only introduces external DON into the northern South China Sea but also enhances NH4+ regeneration and subsequent oxidation to complicate the conventional new production in the boundary zone with DON gradient.
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DOI：
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