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首页> 外文期刊>Marine Chemistry >Mechanism-based deduction of subsurface aragonite saturation state in a semi-enclosed and seasonally stratified coastal sea
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Mechanism-based deduction of subsurface aragonite saturation state in a semi-enclosed and seasonally stratified coastal sea

机译：基于机制的基于机制扣除半封闭和季节分层沿海海中的饱和度饱和状态

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摘要

The North Yellow Sea is a semi-enclosed shallow-water marginal sea of the western North Pacific. Below the seasonal thermocline, subsurface aragonite saturation state (Omega(arag)) values of 1.0-1.5 have frequently been observed in summer and autumn, indicating that marine calcifying organisms in the area are under threat. In this study, we developed mechanism-based models relating summertime and autumnal subsurface Omega(arag) to seawater temperature, practical salinity (S-P), dissolved oxygen and atmospheric CO2 concentration, taking into consideration the combined effects of atmospheric CO2 intrusion, metabolic CO2 increase, and region-specific water mixing modes. For the central offshore areas of the North Yellow Sea, we found that cold water mass Omega(arag) = 0.00885 x [(61.745 x SP + 320 - 17/138 x AOU) (DICWinter + 106/138 x AOU)] + 0.46, where DICWinter is the air-equilibrated bottom-water dissolved inorganic carbon concentration at the beginning of the year, and AOU is the apparent oxygen utilization. In the southern area that was likely influenced by the adjacent Bohai Sea water, we found that nearshore subsurface Omega(arag) = 0.00939 x [(73.245 x SP 17/138 x AOU) (DIC(Winte)r + 106/138 x AOU)] + 0.53. Subsurface Omega(arag) values reconstructed from the two formulae are in general agreement with Omega(arag) values calculated from observed dissolved inorganic carbon and total alkalinity values, with a standard deviation of 0.15 (n = 333). This is a successful attempt to reconstruct coastal subsurface Omega(arag) values from common hydrochemical data using mechanism-based models, and the approach may have applicability in similar coastal systems.
机译：北黄海是西北地区西部半封闭的浅水边缘海。在季节和秋季经常观察到季节性热水下降，地下结构饱和状态（OMEGA（ARAG））值为1.0-1.5，表明该地区的海洋钙化有机体受到威胁。在本研究中，我们开发了基于机制的模型，将夏季和秋季地下表面ω（ARAG）与海水温度，实际盐度（SP），溶解氧和大气二氧化碳浓度相关，考虑到大气二氧化碳侵入，代谢二氧化碳增加的综合影响和地区特定的水混合模式。对于北黄海的中央海外地区，我们发现冷水质量ω（ARAG）= 0.00885 x [（61.745 x sp + 320 - 17/138 x aou）（dicwinter + 106/138 x aou）] + 0.46 ，Dicwinter是在年初的空中平衡的底水溶解无机碳浓度，Aou是明显的氧气利用率。在南部地区可能受到邻近渤海水的影响，我们发现近岸地下ω（ARAG）= 0.00939 X [（73.245 x SP 17/138 x Aou）（DIC（Winte）R + 106/138 x Aou ）] + 0.53。从两种公式重建的次表面ω（ARAG）值与从观察到的溶解的无机碳和总碱度值计算的ω（ARAG）值一致，标准偏差为0.15（n = 333）。这是通过基于机制的模型重建来自普通水化数据的沿海地下ω（ARAG）值的成功尝试，该方法可以在类似的沿海系统中具有适用性。

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