Assessment of the processes controlling the seasonal variations of dissolved inorganic carbon in the North Sea
Assessment of the processes controlling the seasonal variations of dissolved inorganic carbon in the North Sea
复制标题
评估控制北海溶解无机碳季节变化的过程
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
H. D. de Baar
中科院分区：
文献类型：
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作者：
Y. Bozec;H. Thomas;L. Schiettecatte;A. Borges;K. Elkalay;H. D. de Baar
我们使用北海的季节性数据集，包括溶解无机碳（DIC）、二氧化碳分压（pCO2）和无机营养物，来评估控制DIC月度变化的非生物和生物过程。在冬季，平流和海气交换控制和增加了北海北部和中部表层和深层的DIC含量，大气向这些地区供应的CO2约为0.2 mol C m−2 month−1。从2月到7月，净群落产量（NCP）控制了整个北海表层海水DIC的季节变化，净吸收范围为0.5 ~ 1.4 mol C m−2月−1。在8 ~ 12月期间，NCP控制了北海南部DIC的季节变化，净释放量在0.5 ~ 0.8 mol C m−2个月−1之间。同样，在4 ~ 8月期间，在北海北部较深层，NCP是控制DIC浓度的主要因素，净释放范围为0.5 ~ 5.5 mol C m−2个月−1。在北海表层，基于DIC的NCP为4.3±0.4 mol C m−2 yr−1，而基于硝酸盐的NCP为1.6±0.2 mol C m−2 yr−1。在营养耗尽的条件下，营养物质的优先循环（细胞外）和细胞内机制发生，并负责非Redfield吸收DIC而不是硝酸盐和磷酸盐。
We used a seasonal North Sea data set comprising dissolved inorganic carbon (DIC), partial pressure of CO2 (pCO2), and inorganic nutrients to assess the abiotic and biological processes governing the monthly variations of DIC. During winter, advection and air‐sea exchange of CO2 control and increase the DIC content in the surface and deeper layers of the northern and central North Sea, with the atmosphere supplying CO2 on the order of 0.2 mol C m−2 month−1 to these areas. From February to July, net community production (NCP) controls the seasonal variations of DIC in the surface waters of the entire North Sea, with a net uptake ranging from 0.5 to 1.4 mol C m−2 month−1. During the August‐December period, NCP controls the seasonal variations of DIC in the southern North Sea, with a net release ranging from 0.5 to 0.8 mol C m−2 month−1. Similarly, during the April‐August period in the deeper layer of the northern North Sea, the NCP was the main factor controlling DIC concentrations, with a net release ranging from 0.5 to 5.5 mol C m−2 month−1. In the surface layer of the North Sea, NCP on the basis of DIC was 4.3 ± 0.4 mol C m−2 yr−1, whereas, NCP on the basis of nitrate was 1.6 ± 0.2 mol C m−2 yr−1. Under nutrient‐depleted conditions, preferential recycling (extracellular) of nutrients and intracellular mechanisms occurred and were responsible for the non‐Redfield uptake of DIC versus nitrate and phosphate.