文献类型：期刊文献

英文题名：Variation and Influencing Factors of Water Alkalinity in Estuary-Bay Waters of Zhanjiang Bay, China

作者：Shi, Lilan[1,2];He, Yingxian[1];Huang, Xin[1];Yang, Guohuan[3];Zhang, Jibiao[1];Zhang, Peng[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[2]Minist Nat Resources, Inst Oceanog 2, Hangzhou 310012, Peoples R China;[3]Guangdong Ocean Univ, Analyt & Testing Ctr, Zhanjiang 524088, Peoples R China

年份：2026

卷号：18

期号：12

外文期刊名：WATER

收录：SCI-EXPANDED(收录号：WOS:001805230400001)、、EI(收录号：20262621014769)、Scopus(收录号：2-s2.0-105043146864)、WOS

基金：Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004), Guangdong Basic and Applied Basic Research Foundation (2020A1515110483), Guangdong Basic and Applied Basic Research Foundation (2023A1515012769), University Scientific Research Fund for a Ph.D Start-up of Guangdong Ocean University (No. R25020).

语种：英文

外文关键词：Zhanjiang bay; alkalinity; spatiotemporal variation; tidal action

外文摘要：This study investigated the spatial distribution, seasonal variation, and drivers of surface seawater alkalinity (Alk) in Zhanjiang Bay (ZJB) using high-frequency seasonal sampling in the summers and winters of 2023. Surface Alk ranged from 525.3 to 2213.3 mu mol & centerdot;L-1, with mean values of 1373.1 +/- 420.9 mu mol & centerdot;L-1 (summer, n = 28) and 1612.3 +/- 343.7 mu mol & centerdot;L-1 (winter, n = 20). Spatially, Alk increased progressively from the estuary to the inner bay and further to the bay mouth, reflecting a typical dilution gradient. Correlation analyses showed that summer Alk was positively correlated with salinity (rho = 0.706, p < 0.001), indicating that salinity changes associated with conservative mixing were a dominant control, whereas the weaker winter correlation (rho = 0.473, p < 0.001) suggested that biological processes may play a more important role. Tidal forcing was significantly associated with diurnal Alk variations, particularly in the estuary and inner bay. In the estuary, high Alk occurred during high tide, consistent with tidal mixing; in the inner bay, elevated Alk was observed during low tide, suggesting a possible tidal pumping effect. These findings provide baseline data on Alk dynamics in a subtropical estuarine bay and contribute to understanding the carbonate system and buffering capacity in similar coastal systems. However, because measurements of dissolved inorganic carbon and pCO(2) were unavailable, a quantitative assessment of carbon sink capacity requires further investigation.