边际海水的酸化是一个比海洋更复杂的过程。尽管已经对中国边缘海底水的季节性酸化进行了一些研究,地表水酸化的研究还不够充分。对2023年4月渤海(BS)和黄海(YS)地表水的酸化特性及控制因素进行了分析。观察结果表明,BS的平均地表水pH值,北黄海(NYS),南黄海(SYS)分别为8.09±0.06、8.13±0.05和8.15±0.05。浮游植物显著影响pH和Ωarag,而河流输入和生物活性在控制DIC和TA中起着至关重要的作用。黄河严重影响了BS。北黄海冷水团对酸化的影响有限,而南黄海冷水团显著影响了SYS。关于季节性波动,夏季Ωarag明显高于其他季节。DIC和TA在BS和YS中均显示出不同的模式,在pH值波动最小。在过去的二十年里,BS中的pH值每年略有下降,变化率为(-1.45±2.19)×10-5yr-1。相比之下,NYS和SYS略有上升,变化率为(2.39±1.24)×10-5和(1.23±0.76)×10-5yr-1。我们认为,BS和YS中的地表水酸化并未遵循在开放海洋地区观察到的显着酸化的预期趋势。相反,这些边缘海的酸化过程由当地因素主导,如河流输入,生物活性,和冷水团,在过去的二十年中,pH值变化最小。
The
acidification of the marginal seawater was a more intricate process than the ocean. Although some studies have been done on seasonal
acidification in the bottom water of Chinese marginal seas, research on surface water
acidification has still been insufficient. We analyzed the
acidification properties and controlling factors in the Bohai Sea (BS) and Yellow Sea (YS) surface water during April 2023. The observation showed that the average surface water pH of the BS, North Yellow Sea (NYS), and South Yellow Sea (SYS) were 8.09 ± 0.06, 8.13 ± 0.05, and 8.15 ± 0.05. Phytoplankton significantly impacted pH and Ωarag, while riverine inputs and biological activity played a vital role in controlling DIC and TA. The Yellow River significantly impacted the BS. The North Yellow Sea Cold Water Mass had a limited impact on acidification, while the South Yellow Sea Cold Water Mass significantly affected the SYS. Regarding seasonal fluctuations, Ωarag was significantly higher in summer than in other seasons. DIC and TA showed different patterns in both the BS and YS, with a minimal fluctuation in pH. Over the last two decades, the pH in the BS showed a slight annual decline, and the rate of change was (-1.45 ± 2.19) × 10-5 yr-1. In contrast, the NYS and SYS have slightly risen, with rates of change of (2.39 ± 1.24) × 10-5 and (1.23 ± 0.76) × 10-5 yr-1. We believed that surface water acidification in the BS and YS did not follow the expected trend of significant
acidification observed in open oceanic regions. Instead, the acidification process in these marginal seas was dominated by local factors such as riverine inputs, biological activity, and cold water masses, resulting in minimal pH changes over the last two decades.