【摘要】 于2014年分4个季度对大亚湾4个典型功能区(人工鱼礁区、水产养殖区、核电站温排区和石化排污区)以及湾口区表层海水的温度、盐度、p H、总碱度(TA)等进行了调查,比较分析了不同区域表层水体溶解无机碳(DIC)体系的组成和分布特征,估算了海?气界面CO2的交换通量(FCO2),并对FCO2的主要影响因素进行了分析。结果显示,调查海域表层水体的DIC、HCO3–、CO32–浓度和CO2分压pCO2年变化范围分别为1248.8~1841.9μmol·kg–1(1624.8?143.1μmol·kg–1)、1069.2~1615.7μmol·kg–1(1382.5?126.1μmol·kg–1)、152.7~283.5μmol·kg–1(236.2?35.4μmol·kg–1)、11.4~44.9Pa(21.2?7.4Pa);各区域间的DIC、HCO3–、CO32–和pCO2无显著差异(P>0.05)。表层海水FCO2的年变化范围为–37.3~4.5mmol·(m2·d)–1[–22.4?9.8mmol·(m2·d)–1],各区域FCO2(按正负数值大小)的季节变化呈现夏季>秋季>春季>冬季的特征,且夏季显著高于其他季节(P<0.05);在全年尺度上,各区域的FCO2均为负值,表现为大气CO2的汇,碳汇强度呈现湾口区>鱼礁区>排污区>温排区>养殖区的特征,而各区域间无显著差异(P>0.05)。偏回归分析显示,大亚湾湾口区和养殖区的FCO2时空分布主要受盐度影响,在鱼礁区和温排区主要受温度的影响,而在排污区则主要受海水p H的影响。更多还原

【Abstract】 In four different seasons during March?December 2014, four oceanic function areas in Daya Bay, including in an artificial reef area, an aquaculture area, a thermal discharge area, and a petrochemical sewage discharge area, as well as the bay mouth area, were selected as the survey areas. Data of surface temperature, salinity, p H, and total alkalinity(TA) were analyzed to show the distribution of dissolved inorganic carbon(DIC) system, and to estimate sea-air CO2 flux(FCO2) and its influential factors. The results showed that the concentrations of surface DIC, HCO3–, CO32–, and pCO2 ranged from 1248.8 to 1841.9 μmol·kg–1(1624.8±143.1 μmol·kg–1), 1069.2 to 1615.7 μmol·kg–1(1382.5±126.1 μmol·kg–1), 152.7 to 283.5 μmol·kg–1(236.2±35.4 μmol·kg–1), 11.4 to 44.9 Pa(21.2?7.4 Pa), respectively. There were no significant differences among the surveyed areas in terms of concentrations of DIC, HCO3–, CO32–, and pCO2(P > 0.05). FCO2 ranged from –37.3 to 4.5 mmol·(m2·d) –1 [–22.4?9.8 mmol·(m2·d)–1]. The seasonal variation of FCO2 showed an order of summer > autumn > spring > winter, according to positive or negative data; and this parameter in summer was significantly higher than those in the other seasons(P < 0.05). At the annual scale, FCO2 in each investigated area had a negative value, indicating a sink of atmosphere CO2. The distribution of regional carbon sink was in the order of bay mouth area > artificial reef area > petrochemical sewage discharge area > thermal discharge area > aquaculture area, no significant difference being found among these areas(P > 0.05). Based on partial regression coefficients, salinity was the main influencing factor for FCO2 in the bay mouth area and agriculture area; water temperature was, in the artificial reef area and thermal discharge area; and p H was, in the petrochemical sewage discharge area.更多还原