Marine Chemistry & Geochemistry Research Center, Korea Institute of Ocean Science & Technology, Ansan, South Korea.
South Sea Institute, Korea Institute of Ocean Science & Technology, Geoje, South Korea.
Mar Pollut Bull. 2018 Apr;129(1):318-328. doi: 10.1016/j.marpolbul.2018.02.038. Epub 2018 Mar 23.
We investigated the aragonite saturation state (Ω) during all four seasons in a coastal region of southern Korea that receives considerable freshwater input. The surface Ω values were higher during productive seasons with enhanced freshwater influences, likely due to an increased net removal of dissolved inorganic carbon (DIC) from the water column (i.e., biological control). In addition, during the productive seasons, enhancement of Ω was observed with decreasing salinity within a linear mixing zone present between river-influenced surface and saltier bottom waters. DIC appeared to be effectively sequestered from the warmer, less salty surface water by downward flux of organic matter, but not significantly affected by the relatively DIC-rich, cooler and saltier bottom waters under strong stratification conditions during these seasons (i.e., physical control). Low phytoplankton productivity and seasonal breakdown of the stratification caused reduced saturation in other seasons and made the study area a weak sink for atmospheric CO.
我们调查了韩国南部一个沿海地区在四季期间的方解石饱和度 (Ω)，该地区有大量淡水流入。在生产力季节，由于水柱中溶解无机碳 (DIC) 的净去除增加（即生物控制），表面 Ω 值更高。此外，在生产力季节期间，在河流水影响的表层和盐分较高的底层水之间存在的线性混合区内，随着盐度的降低，Ω 值得到增强。在这些季节，由于较强的分层条件下，DIC 似乎通过有机物向下通量有效地从温暖、低盐度的表层水中隔离出来，但受相对 DIC 丰富、较冷和盐分较高的底层水的影响较小（即物理控制）。低浮游植物生产力和季节性分层破裂导致其他季节的饱和度降低，使研究区域成为大气 CO 的弱汇。
