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根据2012年11月和2013年2、5、8月对福建三沙湾盐田港养殖海域进行4个季节调查获得的pH、总碱度(TA)、表层水温、盐度、溶氧和溶解无机碳(DIC)以及叶绿素a等基础数据,估算该区域表层海水溶解无机碳体系各分量的浓度、pCO_2和海-气界面CO_2交换通量,并对影响因素进行分析。结果表明,盐田港表层海水4个季节的DIC、HCO_3~-、CO_3~(2-)和CO_2浓度分别为955~1 957.08、905.08~1 848.13、10.14~124.78和11.48~39.78μmol/L,不同季节之间差异极显著(P<0.01)。盐田港表层海水中的pCO_2在一年中的变化范围为391.27~1 200.49μatm,海-气界面CO_2交换通量全年的范围为0.25~6.93μmol/(m~2·d),表现为大气CO_2的弱源。盐田港海-气界面CO_2交换通量不同季节的差异极显著(P<0.01),在不同站位之间的差异显著(P<0.05)。秋、春季的碳通量最高,夏季碳通量最低,冬季显著低于秋季,但与春季差异不显著。分析表明,水文要素和生物要素等是影响盐田港表层海水中p CO_2和海-气界面CO_2交换通量的重要生态因子,其中,大型海藻的栽培活动有利于该养殖海域对大气CO_2的吸收。
According to four seasons survey conducted in November, 2013 and February, August and August 2013, the pH, total alkalinity (TA), surface water temperature, salinity, dissolved oxygen and dissolved inorganic Carbon (DIC) and chlorophyll a were used to estimate the concentration of dissolved carbon in the surface seawater, CO 2 fluxes between pCO_2 and the sea-air interface, and the influencing factors were analyzed. The results showed that the concentrations of DIC, HCO_3 ~ -, CO_3 ~ (2-) and CO_2 in the surface seawater of Yantian Port were 955-1957.08,905.08 ~ 1848.13,10.14 ~ 124.78 and 11.48 ~ 39.78μmol / L, respectively, The difference between seasons was significant (P <0.01). The variation of pCO_2 in surface seawater of Yantian Port during the year ranged from 391.27 to 1 200.49 μatm, and the flux of CO_2 exchange between the sea-atmosphere interface was 0.25-6.93μmol / (m 2 · d) Weak source of CO_2. There was significant difference (P <0.01) in CO 2 exchange flux of Yantian sea-air interface in different seasons, with significant difference (P <0.05) between different stations. In autumn and spring, the carbon flux was the highest, the carbon flux was the lowest in summer, significantly lower in winter than in autumn, but not significantly different from that in spring. The analysis shows that hydrological factors and biological elements are important ecological factors that affect the CO_2 exchange flux between p CO_2 and the sea-atmosphere interface in the surface seawater of Yantian Port. The cultivation of large-scale seaweed is beneficial to the absorption of atmospheric CO_2 in this area.