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通过在青岛近岸海域采集海水样品,测定了海水pH、总碱度(TA)、溶解无机碳(DIC)以及溶解钙离子,并根据这些参数计算了海水中的碳酸氢根、碳酸根等分量以及海水二氧化碳分压(pCO_2)、碳酸钙饱和度等参数。各站点海水pH范围为8.09~8.18,平均8.13;TA范围为2309~2345(mol/kg,平均2325(mol/kg;DIC范围为2158~2200(mol/kg,平均2180(mol/kg;海水中溶解钙离子的浓度为0.3700~0.3732g/kg,平均0.3716g/kg。求得海水pCO_2范围为371~476(atm,平均415(atm;方解石和文石的饱和度范围分别为2.31~2.84和1.45~1.78,平均值分别为2.57和1.61。通过与温度、盐度进行比较,发现冬末春初青岛近岸海域海水总碱度、溶解无机碳和溶解钙离子具有较为均匀的特征,是冬季混合导致的结果。海水pH有一定的变化性,与营养盐和叶绿素a的关系显示,观测区西部已开始增强的生物生产使海水pH升高,pH是该季节影响海水pCO_2、碳酸钙饱和度等参数的主要因素。该季节青岛近海总体上表现为大气CO_2的弱源,但西部海区是大气CO_2的弱汇。
The seawater pH, total alkalinity (TA), dissolved inorganic carbon (DIC) and dissolved calcium ions were measured by collecting seawater samples in the coastal waters of Qingdao. The bicarbonate and carbonate contents of seawater were calculated according to these parameters As well as seawater carbon dioxide partial pressure (pCO_2), calcium carbonate saturation and other parameters. The range of seawater pH ranged from 8.09 to 8.18, with an average of 8.13. The TA range ranged from 2309 to 2345 (mol / kg, averaged 2325 (mol / kg); DIC ranged from 2158 to 2200 The concentration of dissolved calcium ions in the water ranged from 0.3700 to 0.3732 g / kg with an average of 0.3716 g / kg. The calculated pCO_2 of seawater ranged from 371 to 476 (atm, with an average of 415 (atm; the saturation range of calcite and aragonite was 2.31-2.84 and 1.45 ~ 1.78, with the average values of 2.57 and 1.61, respectively.Comparing with the temperature and salinity, it was found that the total alkalinity, dissolved inorganic carbon and dissolved calcium in coastal waters at the beginning of winter and early spring in Qingdao are relatively uniform, Resulted in a change in seawater pH, and the relationship with nutrients and chlorophyll a showed that the enhanced biological production in the western part of the observation area led to an increase in seawater pH, which is the effect of the season on pCO_2, calcium carbonate saturation, etc. The main factors of the parameters are as follows: During this season, the coastal waters in Qingdao generally show the weak source of atmospheric CO 2, but the western sea areas are the weak sources of atmospheric CO 2.