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根据2010年2月至2010年3月对渤海海峡3个断面39个站位表层、10m层和30m层水体中盐度、水温、叶绿素a以及无机碳等参数的测定数据,分析了该季节溶解无机碳的分布特征以及源汇变化状况,探讨了影响其分布的主要因素。结果显示,调查期间渤海海峡水体中各水层溶解无机碳(DIC)及其组分浓度分布较一致,其中DIC及HCO3-的浓度等值线分布均呈现出从西南向东北梯度降低的趋势,且受温度影响明显;二氧化碳分压[p(CO2)]则表现出与叶绿素a含量成明显负相关的分布特征;位于渤海海峡东部的H断面垂直方向上,由于受黄海、渤海水团在海峡中部交汇混合形成的水体紊流影响,DIC及其组分在断面中部等值线分布较两边曲折。冬季渤海海峡表现出明显的源、汇分区分布特征,整个调查区海-气二氧化碳通量为3.52mmol/(m2·d),表现为大气CO2的弱源。冬季流经渤海海峡的DIC通量约为(130±2)×103 mol/s。
According to the measured data of salinity, water temperature, chlorophyll a and inorganic carbon in the surface water of 39 stations, the water layer of 10m and the water layer of 30m in the three sections of Bohai Strait from February 2010 to March 2010, The distribution characteristics of inorganic carbon and the changes of source and sink, and discussed the main factors affecting the distribution. The results showed that during the investigation period, dissolved inorganic carbon (DIC) and its component concentrations in all aquifers in the Bohai Strait were consistent. The distribution of DIC and HCO3- showed a trend of decreasing from southwest to northeast, (P (CO2)] showed a significant negative correlation with the content of chlorophyll a; in the vertical direction of section H in the east of the Bohai Strait, due to the influence of the Yellow Sea and Bohai Sea water masses in the strait The central part of the DIC and its components distribute in the middle of the section more tortuously than the two sides. The winter Bohai Strait showed obvious distribution of source and sink zones. The sea-to-air carbon dioxide flux in the surveyed area was 3.52 mmol / (m2 · d), showing the weak source of atmospheric CO2. The DIC flux through the Bohai Strait in winter is about (130 ± 2) × 103 mol / s.