摘要：
Summer carbonate characteristics and their controlling factors in the Yellow Sea were studied through a survey in July 2016. pH, total alkalinity (AT) and pertinent data (temperature, salinity, nutrients, and chlorophyll a) were investigated during the cruise. The carbonate characteristics were significantly different between the waters. The results show that the pH varied between 7.915 and 8.307 in the surface and between 7.849 and 8.074 in the bottom. High pH values were detected in the Changjiang Diluted Water (CDW) and the Yellow Sea Coastal Water (YSCoW). ATranged between 2063 and 2358 μmol/kg in the surface and between 2205 and2372 μmol/kg in the bottom, with a same increasing trend from the south to the north. ATin the CDW was low, while ATin the YSCoW was high. The partial pressure of CO2(pCO2) in the surface also had a similar distribution as the total dissolved inorganic carbon (CT), and this was higher in the North Yellow Sea (NYS), especially near the Shandong Peninsula. The aragonite saturation state (ΩAr) decreased from surface to bottom and had a lowest value of 1.28 in the basin of NYS. Relationships between carbonate parameters and environmental factors were studied through the Pearson correlation analysis. Better relationships were generally found between ATand salinity, pH, and nutrients, confirm-ing the large effects of water mixing behaviors and biological processes. Water mixing was the dominated factor of ATdistributions.Phytoplankton growth was restricted in the surface of the central Yellow Sea because of nutrients limitation, ultimately resulting in smaller pH variation. In the bottom, the local remineralization of the biogenic particles released CO2and decreased pH.%根据2016年7月对黄海海域碳酸盐体系参数 pH和总碱度(AT)开展的调查, 结合温度、盐度、营养盐及叶绿素等同步观测数据, 分析了夏季黄海海水碳酸盐体系的特征并讨论了其控制机制.结果表明, 碳酸盐体系特征在不同水团间差异很大.表层与底层pH分别在7.915~8.307和7.849~8.074之间, 高值位于长江冲淡水和黄海沿岸流中.表层与底层AT分别为2063~2358 μmol/kg和2205~2372 μmol/kg,总体表现为由南往北递增.长江冲淡水AT较低, 黄海沿岸流AT较高.海水总溶解无机碳(CT)在黄海北部山东半岛附近含量较高, 底层明显高于表层.表层海水二氧化碳分压(pCO2)与表层CT变化趋势相似.霰石饱和度(ΩAr)在底层较低, 最低值仅为1.28.Pearson 相关分析结果显示, 水团中 AT与盐度的相关性较大(R>0.7), pH与营养盐的相关性较大.说明碳酸盐体系特征主要受水团混合和生物活动的影响.水团混合是影响AT分布的主导因素.表层营养盐浓度过低导致浮游植物生长受限, 受限区域pH变化不大, 底层再矿化过程释放大量CO2导致底层pH降低.
